diff --git a/api/proto/sysml.pb.go b/api/proto/sysml.pb.go
index abde04985..4ceaa67b8 100644
--- a/api/proto/sysml.pb.go
+++ b/api/proto/sysml.pb.go
@@ -4881,10 +4881,13 @@ func (x *UnitFactor) GetExponent() float64 {
 
 // Diagnostic represents a parse/semantic error or warning
 type Diagnostic struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	Severity      string                 `protobuf:"bytes,1,opt,name=severity,proto3" json:"severity,omitempty"` // "error", "warning", "info"
-	Message       string                 `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
-	Span          *Span                  `protobuf:"bytes,3,opt,name=span,proto3" json:"span,omitempty"`
+	state    protoimpl.MessageState `protogen:"open.v1"`
+	Severity string                 `protobuf:"bytes,1,opt,name=severity,proto3" json:"severity,omitempty"` // "error", "warning", "info"
+	Message  string                 `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+	Span     *Span                  `protobuf:"bytes,3,opt,name=span,proto3" json:"span,omitempty"`
+	// Stable identifier to branch on instead of the message: a pass or rule code,
+	// "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+	Code          string `protobuf:"bytes,4,opt,name=code,proto3" json:"code,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -4940,6 +4943,13 @@ func (x *Diagnostic) GetSpan() *Span {
 	return nil
 }
 
+func (x *Diagnostic) GetCode() string {
+	if x != nil {
+		return x.Code
+	}
+	return ""
+}
+
 // Span represents a source location
 type Span struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
@@ -5117,6 +5127,8 @@ type ServerInfoResponse struct {
 	//	               and answers with typed rows.
 	//	"render_document" - the RenderDocument RPC renders a named document to
 	//	               Markdown.
+	//	"diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+	//	               finding none was assigned; without it every code is empty.
 	Capabilities  []string `protobuf:"bytes,2,rep,name=capabilities,proto3" json:"capabilities,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
@@ -6984,12 +6996,13 @@ const file_sysml_proto_rawDesc = "" +
 	"\n" +
 	"UnitFactor\x12\x17\n" +
 	"\aunit_id\x18\x01 \x01(\tR\x06unitId\x12\x1a\n" +
-	"\bexponent\x18\x02 \x01(\x01R\bexponent\"c\n" +
+	"\bexponent\x18\x02 \x01(\x01R\bexponent\"w\n" +
 	"\n" +
 	"Diagnostic\x12\x1a\n" +
 	"\bseverity\x18\x01 \x01(\tR\bseverity\x12\x18\n" +
 	"\amessage\x18\x02 \x01(\tR\amessage\x12\x1f\n" +
-	"\x04span\x18\x03 \x01(\v2\v.sysml.SpanR\x04span\"\x8a\x01\n" +
+	"\x04span\x18\x03 \x01(\v2\v.sysml.SpanR\x04span\x12\x12\n" +
+	"\x04code\x18\x04 \x01(\tR\x04code\"\x8a\x01\n" +
 	"\x04Span\x12\x12\n" +
 	"\x04file\x18\x01 \x01(\tR\x04file\x12\x1d\n" +
 	"\n" +
diff --git a/api/proto/sysml.proto b/api/proto/sysml.proto
index ecd20bd8a..8650b4ca3 100644
--- a/api/proto/sysml.proto
+++ b/api/proto/sysml.proto
@@ -836,6 +836,9 @@ message Diagnostic {
   string severity = 1;  // "error", "warning", "info"
   string message = 2;
   Span span = 3;
+  // Stable identifier to branch on instead of the message: a pass or rule code,
+  // "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+  string code = 4;
 }
 
 // Span represents a source location
@@ -911,6 +914,8 @@ message ServerInfoResponse {
   //                  and answers with typed rows.
   //   "render_document" - the RenderDocument RPC renders a named document to
   //                  Markdown.
+  //   "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+  //                  finding none was assigned; without it every code is empty.
   repeated string capabilities = 2;
 }
 
diff --git a/changes/unreleased/diagnostic-wire-code.added.md b/changes/unreleased/diagnostic-wire-code.added.md
new file mode 100644
index 000000000..276dbe2df
--- /dev/null
+++ b/changes/unreleased/diagnostic-wire-code.added.md
@@ -0,0 +1,7 @@
+- **A wire `Diagnostic` carries its `code`.** The gRPC/Connect `Diagnostic` message gains
+  `string code = 4`, the stable identifier the runtime already assigns: `syntax` for a parse
+  error, the pass or rule code for a validation finding, `choice-point` and `guard-unevaluable`
+  for a run's notes. Every response that carries diagnostics carries it, so a client branches on
+  `code` instead of a message prefix; a diagnostic whose producer assigned no code sends it empty.
+  A service that populates it advertises the `diagnostic_codes` capability. The Go, Python,
+  Node, Rust and Java clients expose it as `Diagnostic.code` and name the capability.
diff --git a/client/opensysml/client_test.go b/client/opensysml/client_test.go
index e5ce87873..a73845ac9 100644
--- a/client/opensysml/client_test.go
+++ b/client/opensysml/client_test.go
@@ -73,6 +73,36 @@ func TestASyntaxErrorIsADiagnosticNotAnError(t *testing.T) {
 	if len(model.Diagnostics) == 0 {
 		t.Error("broken source parsed without diagnostics")
 	}
+	for _, diag := range model.Diagnostics {
+		if diag.Code != "syntax" {
+			t.Errorf("syntax error coded %q, want syntax: %s", diag.Code, diag.Message)
+		}
+	}
+}
+
+func TestADiagnosticCarriesItsCode(t *testing.T) {
+	client := newClient(t)
+	info, err := client.ServerInfo(context.Background())
+	if err != nil {
+		t.Fatalf("ServerInfo: %v", err)
+	}
+	if !info.Has(opensysml.CapabilityDiagnosticCodes) {
+		t.Errorf("capabilities %v do not include %s", info.Capabilities, opensysml.CapabilityDiagnosticCodes)
+	}
+	model, err := client.ParseSource(context.Background(), "package P { part def W { part hub : Missing; } }")
+	if err != nil {
+		t.Fatalf("ParseSource: %v", err)
+	}
+	found := false
+	for _, diag := range model.Diagnostics {
+		if diag.Code == "" {
+			t.Errorf("diagnostic without a code: %s", diag.Message)
+		}
+		found = found || diag.Code == "unresolved"
+	}
+	if !found {
+		t.Errorf("no unresolved diagnostic among %v", model.Diagnostics)
+	}
 }
 
 func TestAMissingFileIsNotFound(t *testing.T) {
diff --git a/client/opensysml/convert.go b/client/opensysml/convert.go
index eee63be49..6c6d939d7 100644
--- a/client/opensysml/convert.go
+++ b/client/opensysml/convert.go
@@ -67,7 +67,7 @@ func diagnosticsFromProto(diags []*pb.Diagnostic) []Diagnostic {
 	}
 	out := make([]Diagnostic, 0, len(diags))
 	for _, diag := range diags {
-		converted := Diagnostic{Severity: diag.Severity, Message: diag.Message}
+		converted := Diagnostic{Severity: diag.Severity, Message: diag.Message, Code: diag.Code}
 		if diag.Span != nil {
 			converted.Span = &Span{
 				File:      diag.Span.File,
diff --git a/client/opensysml/types.go b/client/opensysml/types.go
index 4a039c438..9936db8f1 100644
--- a/client/opensysml/types.go
+++ b/client/opensysml/types.go
@@ -32,6 +32,7 @@ const (
 	CapabilityStructuredValues     = sysmlgrpc.CapabilityStructuredValues
 	CapabilityMeasurementRefs      = sysmlgrpc.CapabilityMeasurementRefs
 	CapabilityFunctionValues       = sysmlgrpc.CapabilityFunctionValues
+	CapabilityDiagnosticCodes      = sysmlgrpc.CapabilityDiagnosticCodes
 	CapabilityVerificationVerdicts = sysmlgrpc.CapabilityVerificationVerdicts
 )
 
@@ -175,6 +176,9 @@ type Diagnostic struct {
 	// Severity is SeverityError, SeverityWarning or SeverityInfo.
 	Severity string
 	Message  string
+	// Code identifies what was found, stable across message wording ("syntax", a
+	// validation code, "choice-point", "guard-unevaluable"); empty when none was assigned.
+	Code string
 	// Span locates the finding in its source, nil when it has no location.
 	Span *Span
 }
diff --git a/clients/java/README.md b/clients/java/README.md
index cf3e63bf4..b2a9ba122 100644
--- a/clients/java/README.md
+++ b/clients/java/README.md
@@ -39,7 +39,12 @@ records (`IntegerValue`, `RealValue`, `ComplexValue`, `QuantityValue`, `ArrayVal
 `VectorValue`, `VectorQuantityValue`, `MeasurementRefValue`, `FunctionValue`, `EnumerationValue`,
 `InstanceReference`, `Sequence`, `NullValue`, `UnsetValue`, …), and `Symbol`,
 `Diagnostic`, `Instance` and `Instantiation` are records with copied collections.
-No generated protobuf message or builder appears in the public API.
+No generated protobuf message or builder appears in the public API. A `Diagnostic`
+is `(severity, message, code, span)`; `code()` is the identifier to branch on
+(`"syntax"`, a validation code such as `"unresolved"`, `"choice-point"`,
+`"guard-unevaluable"`; `""` when the service assigned none), `message()` is for reading. A
+service that populates `code` advertises `Capabilities.DIAGNOSTIC_CODES`; without it every
+code is `""`.
 
 ## Exceptions: unchecked, and the distinction that matters
 
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Capabilities.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Capabilities.java
index 13debef96..b25777bee 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Capabilities.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Capabilities.java
@@ -53,6 +53,9 @@ public final class Capabilities {
   /** The unbounded value {@code *} travels as itself rather than as an unsupported null. */
   public static final String INFINITY_VALUE = "infinity_value";
 
+  /** {@code Diagnostic.code} is populated, so an empty code is a finding none was assigned. */
+  public static final String DIAGNOSTIC_CODES = "diagnostic_codes";
+
   /** The {@code ApplyEdits} RPC edits a parsed model's own source. */
   public static final String APPLY_EDITS = "apply_edits";
 
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Diagnostic.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Diagnostic.java
index 66fd4a117..1a318e640 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Diagnostic.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/Diagnostic.java
@@ -9,20 +9,25 @@
  *
  * @param severity how serious the finding is
  * @param message the finding, as the service words it
+ * @param code stable identifier of what was found, independent of the message wording: a
+ *     validation code, {@code "syntax"}, or {@code "choice-point"} / {@code "guard-unevaluable"}
+ *     on a run; empty when the service assigned none
  * @param span where in the source it is, absent when the service located none
  */
-public record Diagnostic(Severity severity, String message, Optional<Span> span) {
+public record Diagnostic(Severity severity, String message, String code, Optional<Span> span) {
 
   /**
    * Creates a diagnostic.
    *
    * @param severity the severity, never {@code null}
    * @param message the message, never {@code null}
+   * @param code the code, empty rather than {@code null} when there is none
    * @param span the source location, absent when unlocated
    */
   public Diagnostic {
     Objects.requireNonNull(severity, "severity");
     Objects.requireNonNull(message, "message");
+    Objects.requireNonNull(code, "code");
     Objects.requireNonNull(span, "span");
   }
 
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/ModelException.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/ModelException.java
index add21cb7f..77f714038 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/ModelException.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/ModelException.java
@@ -20,7 +20,7 @@
  */
 public class ModelException extends OpenSysMLException {
 
-  private static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 2L;
   private static final int MAX_SERIALIZED_DIAGNOSTICS = 100_000;
 
   private transient List<Diagnostic> diagnostics;
@@ -55,6 +55,7 @@ private void writeObject(ObjectOutputStream stream) throws IOException {
     for (Diagnostic diagnostic : diagnostics) {
       stream.writeObject(diagnostic.severity());
       stream.writeObject(diagnostic.message());
+      stream.writeObject(diagnostic.code());
       stream.writeBoolean(diagnostic.span().isPresent());
       if (diagnostic.span().isPresent()) {
         Diagnostic.Span span = diagnostic.span().orElseThrow();
@@ -81,8 +82,10 @@ private void readObject(ObjectInputStream stream) throws IOException, ClassNotFo
     for (int index = 0; index < count; index++) {
       Object severity = stream.readObject();
       Object message = stream.readObject();
+      Object code = stream.readObject();
       if (!(severity instanceof Diagnostic.Severity diagnosticSeverity)
-          || !(message instanceof String diagnosticMessage)) {
+          || !(message instanceof String diagnosticMessage)
+          || !(code instanceof String diagnosticCode)) {
         throw new InvalidObjectException("invalid diagnostic");
       }
       Optional<Diagnostic.Span> span = Optional.empty();
@@ -100,7 +103,7 @@ private void readObject(ObjectInputStream stream) throws IOException, ClassNotFo
                     stream.readInt(),
                     stream.readInt()));
       }
-      restored.add(new Diagnostic(diagnosticSeverity, diagnosticMessage, span));
+      restored.add(new Diagnostic(diagnosticSeverity, diagnosticMessage, diagnosticCode, span));
     }
     diagnostics = List.copyOf(restored);
   }
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/internal/Protos.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/internal/Protos.java
index 6dfb81c77..9f742ff88 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/internal/Protos.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/internal/Protos.java
@@ -221,6 +221,7 @@ public static List<Diagnostic> diagnostics(
           new Diagnostic(
               Diagnostic.Severity.fromWireName(diagnostic.getSeverity()),
               diagnostic.getMessage(),
+              diagnostic.getCode(),
               diagnostic.hasSpan() ? Optional.of(span(diagnostic.getSpan())) : Optional.empty()));
     }
     return List.copyOf(read);
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Diagnostic.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Diagnostic.java
index 6dfa36f2f..5f928768c 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Diagnostic.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Diagnostic.java
@@ -34,6 +34,7 @@ private Diagnostic(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
   private Diagnostic() {
     severity_ = "";
     message_ = "";
+    code_ = "";
   }
 
   public static final com.google.protobuf.Descriptors.Descriptor
@@ -162,6 +163,55 @@ public org.openmbee.opensysml.proto.SpanOrBuilder getSpanOrBuilder() {
     return span_ == null ? org.openmbee.opensysml.proto.Span.getDefaultInstance() : span_;
   }
 
+  public static final int CODE_FIELD_NUMBER = 4;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object code_ = "";
+  /**
+   * <pre>
+   * Stable identifier to branch on instead of the message: a pass or rule code,
+   * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+   * </pre>
+   *
+   * <code>string code = 4 [json_name = "code"];</code>
+   * @return The code.
+   */
+  @java.lang.Override
+  public java.lang.String getCode() {
+    java.lang.Object ref = code_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      code_ = s;
+      return s;
+    }
+  }
+  /**
+   * <pre>
+   * Stable identifier to branch on instead of the message: a pass or rule code,
+   * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+   * </pre>
+   *
+   * <code>string code = 4 [json_name = "code"];</code>
+   * @return The bytes for code.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getCodeBytes() {
+    java.lang.Object ref = code_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      code_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
   private byte memoizedIsInitialized = -1;
   @java.lang.Override
   public final boolean isInitialized() {
@@ -185,6 +235,9 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
     if (((bitField0_ & 0x00000001) != 0)) {
       output.writeMessage(3, getSpan());
     }
+    if (!com.google.protobuf.GeneratedMessage.isStringEmpty(code_)) {
+      com.google.protobuf.GeneratedMessage.writeString(output, 4, code_);
+    }
     getUnknownFields().writeTo(output);
   }
 
@@ -204,6 +257,9 @@ public int getSerializedSize() {
       size += com.google.protobuf.CodedOutputStream
         .computeMessageSize(3, getSpan());
     }
+    if (!com.google.protobuf.GeneratedMessage.isStringEmpty(code_)) {
+      size += com.google.protobuf.GeneratedMessage.computeStringSize(4, code_);
+    }
     size += getUnknownFields().getSerializedSize();
     memoizedSize = size;
     return size;
@@ -228,6 +284,8 @@ public boolean equals(final java.lang.Object obj) {
       if (!getSpan()
           .equals(other.getSpan())) return false;
     }
+    if (!getCode()
+        .equals(other.getCode())) return false;
     if (!getUnknownFields().equals(other.getUnknownFields())) return false;
     return true;
   }
@@ -247,6 +305,8 @@ public int hashCode() {
       hash = (37 * hash) + SPAN_FIELD_NUMBER;
       hash = (53 * hash) + getSpan().hashCode();
     }
+    hash = (37 * hash) + CODE_FIELD_NUMBER;
+    hash = (53 * hash) + getCode().hashCode();
     hash = (29 * hash) + getUnknownFields().hashCode();
     memoizedHashCode = hash;
     return hash;
@@ -395,6 +455,7 @@ public Builder clear() {
         spanBuilder_.dispose();
         spanBuilder_ = null;
       }
+      code_ = "";
       return this;
     }
 
@@ -441,6 +502,9 @@ private void buildPartial0(org.openmbee.opensysml.proto.Diagnostic result) {
             : spanBuilder_.build();
         to_bitField0_ |= 0x00000001;
       }
+      if (((from_bitField0_ & 0x00000008) != 0)) {
+        result.code_ = code_;
+      }
       result.bitField0_ |= to_bitField0_;
     }
 
@@ -469,6 +533,11 @@ public Builder mergeFrom(org.openmbee.opensysml.proto.Diagnostic other) {
       if (other.hasSpan()) {
         mergeSpan(other.getSpan());
       }
+      if (!other.getCode().isEmpty()) {
+        code_ = other.code_;
+        bitField0_ |= 0x00000008;
+        onChanged();
+      }
       this.mergeUnknownFields(other.getUnknownFields());
       onChanged();
       return this;
@@ -512,6 +581,11 @@ public Builder mergeFrom(
               bitField0_ |= 0x00000004;
               break;
             } // case 26
+            case 34: {
+              code_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000008;
+              break;
+            } // case 34
             default: {
               if (!super.parseUnknownField(input, extensionRegistry, tag)) {
                 done = true; // was an endgroup tag
@@ -814,6 +888,103 @@ public org.openmbee.opensysml.proto.SpanOrBuilder getSpanOrBuilder() {
       return spanBuilder_;
     }
 
+    private java.lang.Object code_ = "";
+    /**
+     * <pre>
+     * Stable identifier to branch on instead of the message: a pass or rule code,
+     * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+     * </pre>
+     *
+     * <code>string code = 4 [json_name = "code"];</code>
+     * @return The code.
+     */
+    public java.lang.String getCode() {
+      java.lang.Object ref = code_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        code_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * <pre>
+     * Stable identifier to branch on instead of the message: a pass or rule code,
+     * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+     * </pre>
+     *
+     * <code>string code = 4 [json_name = "code"];</code>
+     * @return The bytes for code.
+     */
+    public com.google.protobuf.ByteString
+        getCodeBytes() {
+      java.lang.Object ref = code_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        code_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * <pre>
+     * Stable identifier to branch on instead of the message: a pass or rule code,
+     * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+     * </pre>
+     *
+     * <code>string code = 4 [json_name = "code"];</code>
+     * @param value The code to set.
+     * @return This builder for chaining.
+     */
+    public Builder setCode(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      code_ = value;
+      bitField0_ |= 0x00000008;
+      onChanged();
+      return this;
+    }
+    /**
+     * <pre>
+     * Stable identifier to branch on instead of the message: a pass or rule code,
+     * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+     * </pre>
+     *
+     * <code>string code = 4 [json_name = "code"];</code>
+     * @return This builder for chaining.
+     */
+    public Builder clearCode() {
+      code_ = getDefaultInstance().getCode();
+      bitField0_ = (bitField0_ & ~0x00000008);
+      onChanged();
+      return this;
+    }
+    /**
+     * <pre>
+     * Stable identifier to branch on instead of the message: a pass or rule code,
+     * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+     * </pre>
+     *
+     * <code>string code = 4 [json_name = "code"];</code>
+     * @param value The bytes for code to set.
+     * @return This builder for chaining.
+     */
+    public Builder setCodeBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      code_ = value;
+      bitField0_ |= 0x00000008;
+      onChanged();
+      return this;
+    }
+
     // @@protoc_insertion_point(builder_scope:sysml.Diagnostic)
   }
 
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/DiagnosticOrBuilder.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/DiagnosticOrBuilder.java
index 8a8c4abdb..a4eff47d9 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/DiagnosticOrBuilder.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/DiagnosticOrBuilder.java
@@ -56,4 +56,26 @@ public interface DiagnosticOrBuilder extends
    * <code>.sysml.Span span = 3 [json_name = "span"];</code>
    */
   org.openmbee.opensysml.proto.SpanOrBuilder getSpanOrBuilder();
+
+  /**
+   * <pre>
+   * Stable identifier to branch on instead of the message: a pass or rule code,
+   * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+   * </pre>
+   *
+   * <code>string code = 4 [json_name = "code"];</code>
+   * @return The code.
+   */
+  java.lang.String getCode();
+  /**
+   * <pre>
+   * Stable identifier to branch on instead of the message: a pass or rule code,
+   * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+   * </pre>
+   *
+   * <code>string code = 4 [json_name = "code"];</code>
+   * @return The bytes for code.
+   */
+  com.google.protobuf.ByteString
+      getCodeBytes();
 }
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponse.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponse.java
index c4311fadf..c0f626e26 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponse.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponse.java
@@ -161,6 +161,8 @@ public java.lang.String getVersion() {
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -226,6 +228,8 @@ public java.lang.String getVersion() {
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -290,6 +294,8 @@ public int getCapabilitiesCount() {
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -355,6 +361,8 @@ public java.lang.String getCapabilities(int index) {
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -869,6 +877,8 @@ private void ensureCapabilitiesIsMutable() {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -935,6 +945,8 @@ private void ensureCapabilitiesIsMutable() {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -999,6 +1011,8 @@ public int getCapabilitiesCount() {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1064,6 +1078,8 @@ public java.lang.String getCapabilities(int index) {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1130,6 +1146,8 @@ public java.lang.String getCapabilities(int index) {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1202,6 +1220,8 @@ public Builder setCapabilities(
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1273,6 +1293,8 @@ public Builder addCapabilities(
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1344,6 +1366,8 @@ public Builder addAllCapabilities(
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -1412,6 +1436,8 @@ public Builder clearCapabilities() {
      * and answers with typed rows.
      * "render_document" - the RenderDocument RPC renders a named document to
      * Markdown.
+     * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+     * finding none was assigned; without it every code is empty.
      * </pre>
      *
      * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponseOrBuilder.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponseOrBuilder.java
index d38de77f3..15c8bf03c 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponseOrBuilder.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/ServerInfoResponseOrBuilder.java
@@ -90,6 +90,8 @@ public interface ServerInfoResponseOrBuilder extends
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -153,6 +155,8 @@ public interface ServerInfoResponseOrBuilder extends
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -215,6 +219,8 @@ public interface ServerInfoResponseOrBuilder extends
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
@@ -278,6 +284,8 @@ public interface ServerInfoResponseOrBuilder extends
    * and answers with typed rows.
    * "render_document" - the RenderDocument RPC renders a named document to
    * Markdown.
+   * "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   * finding none was assigned; without it every code is empty.
    * </pre>
    *
    * <code>repeated string capabilities = 2 [json_name = "capabilities"];</code>
diff --git a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Sysml.java b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Sysml.java
index 37099f9c3..ab9308b4e 100644
--- a/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Sysml.java
+++ b/clients/java/opensysml-client/src/main/java/org/openmbee/opensysml/proto/Sysml.java
@@ -746,156 +746,156 @@ public static void registerAllExtensions(
       "eNum\022\033\n\tscale_den\030\002 \001(\001R\010scaleDen\022+\n\007fac" +
       "tors\030\003 \003(\0132\021.sysml.UnitFactorR\007factors\"A" +
       "\n\nUnitFactor\022\027\n\007unit_id\030\001 \001(\tR\006unitId\022\032\n" +
-      "\010exponent\030\002 \001(\001R\010exponent\"c\n\nDiagnostic\022" +
+      "\010exponent\030\002 \001(\001R\010exponent\"w\n\nDiagnostic\022" +
       "\032\n\010severity\030\001 \001(\tR\010severity\022\030\n\007message\030\002" +
       " \001(\tR\007message\022\037\n\004span\030\003 \001(\0132\013.sysml.Span" +
-      "R\004span\"\212\001\n\004Span\022\022\n\004file\030\001 \001(\tR\004file\022\035\n\ns" +
-      "tart_line\030\002 \001(\005R\tstartLine\022\033\n\tstart_col\030" +
-      "\003 \001(\005R\010startCol\022\031\n\010end_line\030\004 \001(\005R\007endLi" +
-      "ne\022\027\n\007end_col\030\005 \001(\005R\006endCol\"\023\n\021ServerInf" +
-      "oRequest\"R\n\022ServerInfoResponse\022\030\n\007versio" +
-      "n\030\001 \001(\tR\007version\022\"\n\014capabilities\030\002 \003(\tR\014" +
-      "capabilities\"p\n\014QueryRequest\022\035\n\nmodel_ha" +
-      "sh\030\001 \001(\tR\tmodelHash\022\"\n\005query\030\002 \001(\0132\014.sys" +
-      "ml.QueryR\005query\022\035\n\noslc_query\030\003 \001(\tR\tosl" +
-      "cQuery\"F\n\rQueryResponse\0225\n\010elements\030\001 \003(" +
-      "\0132\031.sysml.QueryResultElementR\010elements\"^" +
-      "\n\005Query\022\024\n\005scope\030\001 \003(\tR\005scope\022\026\n\006select\030" +
-      "\002 \003(\tR\006select\022\'\n\005where\030\003 \001(\0132\021.sysml.Con" +
-      "straintR\005where\"\222\001\n\nConstraint\022:\n\tprimiti" +
-      "ve\030\001 \001(\0132\032.sysml.PrimitiveConstraintH\000R\t" +
-      "primitive\022:\n\tcomposite\030\002 \001(\0132\032.sysml.Com" +
-      "positeConstraintH\000R\tcompositeB\014\n\nconstra" +
-      "int\"\227\001\n\023PrimitiveConstraint\022\030\n\007inverse\030\001" +
-      " \001(\010R\007inverse\022\032\n\010property\030\002 \001(\tR\010propert" +
-      "y\0224\n\010operator\030\003 \001(\0162\030.sysml.PrimitiveOpe" +
-      "ratorR\010operator\022\024\n\005value\030\004 \003(\tR\005value\"~\n" +
-      "\023CompositeConstraint\0224\n\010operator\030\001 \001(\0162\030" +
-      ".sysml.CompositeOperatorR\010operator\0221\n\nco" +
-      "nstraint\030\002 \003(\0132\021.sysml.ConstraintR\nconst" +
-      "raint\"\302\001\n\022QueryResultElement\022\016\n\002id\030\001 \001(\t" +
-      "R\002id\022\022\n\004type\030\002 \001(\tR\004type\022I\n\nproperties\030\003" +
-      " \003(\0132).sysml.QueryResultElement.Properti" +
-      "esEntryR\nproperties\032=\n\017PropertiesEntry\022\020" +
-      "\n\003key\030\001 \001(\tR\003key\022\024\n\005value\030\002 \001(\tR\005value:\002" +
-      "8\001\"\220\001\n\nSweepRange\022\034\n\tparameter\030\001 \001(\tR\tpa" +
-      "rameter\022\"\n\005start\030\002 \001(\0132\014.sysml.ValueR\005st" +
-      "art\022\036\n\003end\030\003 \001(\0132\014.sysml.ValueR\003end\022 \n\004s" +
-      "tep\030\004 \001(\0132\014.sysml.ValueR\004step\"\244\003\n\017RunSwe" +
-      "epRequest\022\035\n\nmodel_hash\030\001 \001(\tR\tmodelHash" +
-      "\022\033\n\tsymbol_id\030\002 \001(\tR\010symbolId\022*\n\021subject" +
-      "_symbol_id\030\003 \001(\tR\017subjectSymbolId\022*\n\targ" +
-      "uments\030\004 \003(\0132\014.sysml.ValueR\targuments\022S\n" +
-      "\017named_arguments\030\005 \003(\0132*.sysml.RunSweepR" +
-      "equest.NamedArgumentsEntryR\016namedArgumen" +
-      "ts\022)\n\006ranges\030\006 \003(\0132\021.sysml.SweepRangeR\006r" +
-      "anges\022\030\n\007samples\030\007 \001(\003R\007samples\022\022\n\004seed\030" +
-      "\010 \001(\004R\004seed\032O\n\023NamedArgumentsEntry\022\020\n\003ke" +
-      "y\030\001 \001(\tR\003key\022\"\n\005value\030\002 \001(\0132\014.sysml.Valu" +
-      "eR\005value:\0028\001\"\210\002\n\010SweepRow\022)\n\006inputs\030\001 \003(" +
-      "\0132\021.sysml.CalcOutputR\006inputs\022+\n\007outputs\030" +
-      "\002 \003(\0132\021.sysml.CalcOutputR\007outputs\022*\n\010ver" +
-      "dicts\030\003 \003(\0132\016.sysml.VerdictR\010verdicts\022%\n" +
-      "\016elapsed_micros\030\004 \001(\003R\relapsedMicros\022\024\n\005" +
-      "error\030\005 \001(\tR\005error\022;\n\016failure_reason\030\006 \001" +
-      "(\0162\024.sysml.FailureReasonR\rfailureReason\"" +
-      "\274\002\n\020RunSweepResponse\022#\n\004rows\030\001 \003(\0132\017.sys" +
-      "ml.SweepRowR\004rows\022\036\n\nparameters\030\002 \003(\tR\np" +
-      "arameters\022\030\n\007sampled\030\003 \001(\010R\007sampled\022\022\n\004s" +
-      "eed\030\004 \001(\004R\004seed\022\024\n\005error\030\005 \001(\tR\005error\0223\n" +
-      "\013diagnostics\030\006 \003(\0132\021.sysml.DiagnosticR\013d" +
-      "iagnostics\022;\n\016failure_reason\030\007 \001(\0162\024.sys" +
-      "ml.FailureReasonR\rfailureReason\022-\n\tinsta" +
-      "nces\030\010 \003(\0132\017.sysml.InstanceR\tinstances\"\214" +
-      "\001\n\027RunDocumentQueryRequest\022\035\n\nmodel_hash" +
-      "\030\001 \001(\tR\tmodelHash\022\031\n\010query_id\030\002 \001(\tR\007que" +
-      "ryId\0227\n\010bindings\030\003 \003(\0132\033.sysml.DocumentQ" +
-      "ueryBindingR\010bindings\"b\n\024DocumentQueryBi" +
-      "nding\022\034\n\tparameter\030\001 \001(\tR\tparameter\022,\n\006v" +
-      "alues\030\002 \003(\0132\024.sysml.DocumentValueR\006value" +
-      "s\"\256\002\n\rDocumentValue\022\037\n\nelement_id\030\001 \001(\tH" +
-      "\000R\telementId\022#\n\014string_value\030\002 \001(\tH\000R\013st" +
-      "ringValue\022\035\n\tint_value\030\003 \001(\003H\000R\010intValue" +
-      "\022\037\n\nreal_value\030\004 \001(\001H\000R\trealValue\022\037\n\nboo" +
-      "l_value\030\005 \001(\010H\000R\tboolValue\022\034\n\010infinity\030\006" +
-      " \001(\010H\000R\010infinity\022-\n\010quantity\030\010 \001(\0132\017.sys" +
-      "ml.QuantityH\000R\010quantity\022!\n\014element_type\030" +
-      "\007 \001(\tR\013elementTypeB\006\n\004kind\")\n\023DocumentQu" +
-      "eryColumn\022\022\n\004name\030\001 \001(\tR\004name\"A\n\021Documen" +
-      "tQueryCell\022,\n\006values\030\001 \003(\0132\024.sysml.Docum" +
-      "entValueR\006values\"r\n\020DocumentQueryRow\022.\n\007" +
-      "element\030\001 \001(\0132\024.sysml.DocumentValueR\007ele" +
-      "ment\022.\n\005cells\030\002 \003(\0132\030.sysml.DocumentQuer" +
-      "yCellR\005cells\"}\n\030RunDocumentQueryResponse" +
-      "\0224\n\007columns\030\001 \003(\0132\032.sysml.DocumentQueryC" +
-      "olumnR\007columns\022+\n\004rows\030\002 \003(\0132\027.sysml.Doc" +
-      "umentQueryRowR\004rows\"W\n\025RenderDocumentReq" +
-      "uest\022\035\n\nmodel_hash\030\001 \001(\tR\tmodelHash\022\037\n\013d" +
-      "ocument_id\030\002 \001(\tR\ndocumentId\"4\n\026RenderDo" +
-      "cumentResponse\022\032\n\010markdown\030\001 \001(\tR\010markdo" +
-      "wn*\223\001\n\rFailureReason\022\036\n\032FAILURE_REASON_U" +
-      "NSPECIFIED\020\000\022\035\n\031FAILURE_REASON_EVALUATIO" +
-      "N\020\001\022\035\n\031FAILURE_REASON_WRONG_KIND\020\002\022$\n FA" +
-      "ILURE_REASON_AMBIGUOUS_SUBJECT\020\003*\235\004\n\013Edi" +
-      "tFailure\022\034\n\030EDIT_FAILURE_UNSPECIFIED\020\000\022\036" +
-      "\n\032EDIT_FAILURE_NO_OPERATIONS\020\001\022\037\n\033EDIT_F" +
-      "AILURE_UNKNOWN_TARGET\020\002\022!\n\035EDIT_FAILURE_" +
-      "AMBIGUOUS_TARGET\020\003\022\033\n\027EDIT_FAILURE_NOT_V" +
-      "ALUED\020\004\022\036\n\032EDIT_FAILURE_INVALID_VALUE\020\005\022" +
-      "\035\n\031EDIT_FAILURE_INVALID_NAME\020\006\022\032\n\026EDIT_F" +
-      "AILURE_NOT_NAMED\020\007\022\"\n\036EDIT_FAILURE_RENAM" +
-      "E_REFERENCED\020\010\022\"\n\036EDIT_FAILURE_OVERLAPPI" +
-      "NG_EDITS\020\t\022\037\n\033EDIT_FAILURE_RESULT_INVALI" +
-      "D\020\n\022\036\n\032EDIT_FAILURE_OWNER_UNKNOWN\020\013\022$\n E" +
-      "DIT_FAILURE_OWNER_NOT_NAMESPACE\020\014\022\035\n\031EDI" +
-      "T_FAILURE_ILLEGAL_KIND\020\r\022\"\n\036EDIT_FAILURE" +
-      "_MEMBER_NAME_TAKEN\020\016\022\"\n\036EDIT_FAILURE_DEL" +
-      "ETE_REFERENCED\020\017*\222\001\n\021PrimitiveOperator\022\"" +
-      "\n\036PRIMITIVE_OPERATOR_UNSPECIFIED\020\000\022\034\n\030PR" +
-      "IMITIVE_OPERATOR_EQUAL\020\001\022\036\n\032PRIMITIVE_OP" +
-      "ERATOR_GREATER\020\002\022\033\n\027PRIMITIVE_OPERATOR_L" +
-      "ESS\020\003*n\n\021CompositeOperator\022\"\n\036COMPOSITE_" +
-      "OPERATOR_UNSPECIFIED\020\000\022\032\n\026COMPOSITE_OPER" +
-      "ATOR_AND\020\001\022\031\n\025COMPOSITE_OPERATOR_OR\020\0022\244\013" +
-      "\n\014SysMLService\022D\n\rGetServerInfo\022\030.sysml." +
-      "ServerInfoRequest\032\031.sysml.ServerInfoResp" +
-      "onse\022>\n\tParseFile\022\027.sysml.ParseFileReque" +
-      "st\032\030.sysml.ParseFileResponse\022G\n\014ParseSou" +
-      "rces\022\032.sysml.ParseSourcesRequest\032\033.sysml" +
-      ".ParseSourcesResponse\022;\n\tGetSymbol\022\027.sys" +
-      "ml.GetSymbolRequest\032\025.sysml.SymbolRespon" +
-      "se\022G\n\016GetDiagnostics\022\031.sysml.Diagnostics" +
-      "Request\032\032.sysml.DiagnosticsResponse\022;\n\010E" +
-      "valuate\022\026.sysml.EvaluateRequest\032\027.sysml." +
-      "EvaluateResponse\022D\n\013Instantiate\022\031.sysml." +
-      "InstantiateRequest\032\032.sysml.InstantiateRe" +
-      "sponse\022J\n\rExecuteAction\022\033.sysml.ExecuteA" +
-      "ctionRequest\032\034.sysml.ExecuteActionRespon" +
-      "se\022G\n\014ExecuteState\022\032.sysml.ExecuteStateR" +
-      "equest\032\033.sysml.ExecuteStateResponse\0228\n\007C" +
-      "onvert\022\025.sysml.ConvertRequest\032\026.sysml.Co" +
-      "nvertResponse\022A\n\nApplyEdits\022\030.sysml.Appl" +
-      "yEditsRequest\032\031.sysml.ApplyEditsResponse" +
-      "\022S\n\020VerifyConstraint\022\036.sysml.VerifyConst" +
-      "raintRequest\032\037.sysml.VerifyConstraintRes" +
-      "ponse\022V\n\021VerifyRequirement\022\037.sysml.Verif" +
-      "yRequirementRequest\032 .sysml.VerifyRequir" +
-      "ementResponse\022Y\n\022VerifySatisfaction\022 .sy" +
-      "sml.VerifySatisfactionRequest\032!.sysml.Ve" +
-      "rifySatisfactionResponse\022G\n\014EvaluateCalc" +
-      "\022\032.sysml.EvaluateCalcRequest\032\033.sysml.Eva" +
-      "luateCalcResponse\022D\n\013RunAnalysis\022\031.sysml" +
-      ".RunAnalysisRequest\032\032.sysml.RunAnalysisR" +
-      "esponse\022;\n\010RunSweep\022\026.sysml.RunSweepRequ" +
-      "est\032\027.sysml.RunSweepResponse\0222\n\005Query\022\023." +
-      "sysml.QueryRequest\032\024.sysml.QueryResponse" +
-      "\022S\n\020RunDocumentQuery\022\036.sysml.RunDocument",
-      "QueryRequest\032\037.sysml.RunDocumentQueryRes" +
-      "ponse\022M\n\016RenderDocument\022\034.sysml.RenderDo" +
-      "cumentRequest\032\035.sysml.RenderDocumentResp" +
-      "onseBJ\n\034org.openmbee.opensysml.protoP\001Z(" +
-      "github.com/Open-MBEE/OpenSysML/api/proto" +
-      "b\006proto3"
+      "R\004span\022\022\n\004code\030\004 \001(\tR\004code\"\212\001\n\004Span\022\022\n\004f" +
+      "ile\030\001 \001(\tR\004file\022\035\n\nstart_line\030\002 \001(\005R\tsta" +
+      "rtLine\022\033\n\tstart_col\030\003 \001(\005R\010startCol\022\031\n\010e" +
+      "nd_line\030\004 \001(\005R\007endLine\022\027\n\007end_col\030\005 \001(\005R" +
+      "\006endCol\"\023\n\021ServerInfoRequest\"R\n\022ServerIn" +
+      "foResponse\022\030\n\007version\030\001 \001(\tR\007version\022\"\n\014" +
+      "capabilities\030\002 \003(\tR\014capabilities\"p\n\014Quer" +
+      "yRequest\022\035\n\nmodel_hash\030\001 \001(\tR\tmodelHash\022" +
+      "\"\n\005query\030\002 \001(\0132\014.sysml.QueryR\005query\022\035\n\no" +
+      "slc_query\030\003 \001(\tR\toslcQuery\"F\n\rQueryRespo" +
+      "nse\0225\n\010elements\030\001 \003(\0132\031.sysml.QueryResul" +
+      "tElementR\010elements\"^\n\005Query\022\024\n\005scope\030\001 \003" +
+      "(\tR\005scope\022\026\n\006select\030\002 \003(\tR\006select\022\'\n\005whe" +
+      "re\030\003 \001(\0132\021.sysml.ConstraintR\005where\"\222\001\n\nC" +
+      "onstraint\022:\n\tprimitive\030\001 \001(\0132\032.sysml.Pri" +
+      "mitiveConstraintH\000R\tprimitive\022:\n\tcomposi" +
+      "te\030\002 \001(\0132\032.sysml.CompositeConstraintH\000R\t" +
+      "compositeB\014\n\nconstraint\"\227\001\n\023PrimitiveCon" +
+      "straint\022\030\n\007inverse\030\001 \001(\010R\007inverse\022\032\n\010pro" +
+      "perty\030\002 \001(\tR\010property\0224\n\010operator\030\003 \001(\0162" +
+      "\030.sysml.PrimitiveOperatorR\010operator\022\024\n\005v" +
+      "alue\030\004 \003(\tR\005value\"~\n\023CompositeConstraint" +
+      "\0224\n\010operator\030\001 \001(\0162\030.sysml.CompositeOper" +
+      "atorR\010operator\0221\n\nconstraint\030\002 \003(\0132\021.sys" +
+      "ml.ConstraintR\nconstraint\"\302\001\n\022QueryResul" +
+      "tElement\022\016\n\002id\030\001 \001(\tR\002id\022\022\n\004type\030\002 \001(\tR\004" +
+      "type\022I\n\nproperties\030\003 \003(\0132).sysml.QueryRe" +
+      "sultElement.PropertiesEntryR\nproperties\032" +
+      "=\n\017PropertiesEntry\022\020\n\003key\030\001 \001(\tR\003key\022\024\n\005" +
+      "value\030\002 \001(\tR\005value:\0028\001\"\220\001\n\nSweepRange\022\034\n" +
+      "\tparameter\030\001 \001(\tR\tparameter\022\"\n\005start\030\002 \001" +
+      "(\0132\014.sysml.ValueR\005start\022\036\n\003end\030\003 \001(\0132\014.s" +
+      "ysml.ValueR\003end\022 \n\004step\030\004 \001(\0132\014.sysml.Va" +
+      "lueR\004step\"\244\003\n\017RunSweepRequest\022\035\n\nmodel_h" +
+      "ash\030\001 \001(\tR\tmodelHash\022\033\n\tsymbol_id\030\002 \001(\tR" +
+      "\010symbolId\022*\n\021subject_symbol_id\030\003 \001(\tR\017su" +
+      "bjectSymbolId\022*\n\targuments\030\004 \003(\0132\014.sysml" +
+      ".ValueR\targuments\022S\n\017named_arguments\030\005 \003" +
+      "(\0132*.sysml.RunSweepRequest.NamedArgument" +
+      "sEntryR\016namedArguments\022)\n\006ranges\030\006 \003(\0132\021" +
+      ".sysml.SweepRangeR\006ranges\022\030\n\007samples\030\007 \001" +
+      "(\003R\007samples\022\022\n\004seed\030\010 \001(\004R\004seed\032O\n\023Named" +
+      "ArgumentsEntry\022\020\n\003key\030\001 \001(\tR\003key\022\"\n\005valu" +
+      "e\030\002 \001(\0132\014.sysml.ValueR\005value:\0028\001\"\210\002\n\010Swe" +
+      "epRow\022)\n\006inputs\030\001 \003(\0132\021.sysml.CalcOutput" +
+      "R\006inputs\022+\n\007outputs\030\002 \003(\0132\021.sysml.CalcOu" +
+      "tputR\007outputs\022*\n\010verdicts\030\003 \003(\0132\016.sysml." +
+      "VerdictR\010verdicts\022%\n\016elapsed_micros\030\004 \001(" +
+      "\003R\relapsedMicros\022\024\n\005error\030\005 \001(\tR\005error\022;" +
+      "\n\016failure_reason\030\006 \001(\0162\024.sysml.FailureRe" +
+      "asonR\rfailureReason\"\274\002\n\020RunSweepResponse" +
+      "\022#\n\004rows\030\001 \003(\0132\017.sysml.SweepRowR\004rows\022\036\n" +
+      "\nparameters\030\002 \003(\tR\nparameters\022\030\n\007sampled" +
+      "\030\003 \001(\010R\007sampled\022\022\n\004seed\030\004 \001(\004R\004seed\022\024\n\005e" +
+      "rror\030\005 \001(\tR\005error\0223\n\013diagnostics\030\006 \003(\0132\021" +
+      ".sysml.DiagnosticR\013diagnostics\022;\n\016failur" +
+      "e_reason\030\007 \001(\0162\024.sysml.FailureReasonR\rfa" +
+      "ilureReason\022-\n\tinstances\030\010 \003(\0132\017.sysml.I" +
+      "nstanceR\tinstances\"\214\001\n\027RunDocumentQueryR" +
+      "equest\022\035\n\nmodel_hash\030\001 \001(\tR\tmodelHash\022\031\n" +
+      "\010query_id\030\002 \001(\tR\007queryId\0227\n\010bindings\030\003 \003" +
+      "(\0132\033.sysml.DocumentQueryBindingR\010binding" +
+      "s\"b\n\024DocumentQueryBinding\022\034\n\tparameter\030\001" +
+      " \001(\tR\tparameter\022,\n\006values\030\002 \003(\0132\024.sysml." +
+      "DocumentValueR\006values\"\256\002\n\rDocumentValue\022" +
+      "\037\n\nelement_id\030\001 \001(\tH\000R\telementId\022#\n\014stri" +
+      "ng_value\030\002 \001(\tH\000R\013stringValue\022\035\n\tint_val" +
+      "ue\030\003 \001(\003H\000R\010intValue\022\037\n\nreal_value\030\004 \001(\001" +
+      "H\000R\trealValue\022\037\n\nbool_value\030\005 \001(\010H\000R\tboo" +
+      "lValue\022\034\n\010infinity\030\006 \001(\010H\000R\010infinity\022-\n\010" +
+      "quantity\030\010 \001(\0132\017.sysml.QuantityH\000R\010quant" +
+      "ity\022!\n\014element_type\030\007 \001(\tR\013elementTypeB\006" +
+      "\n\004kind\")\n\023DocumentQueryColumn\022\022\n\004name\030\001 " +
+      "\001(\tR\004name\"A\n\021DocumentQueryCell\022,\n\006values" +
+      "\030\001 \003(\0132\024.sysml.DocumentValueR\006values\"r\n\020" +
+      "DocumentQueryRow\022.\n\007element\030\001 \001(\0132\024.sysm" +
+      "l.DocumentValueR\007element\022.\n\005cells\030\002 \003(\0132" +
+      "\030.sysml.DocumentQueryCellR\005cells\"}\n\030RunD" +
+      "ocumentQueryResponse\0224\n\007columns\030\001 \003(\0132\032." +
+      "sysml.DocumentQueryColumnR\007columns\022+\n\004ro" +
+      "ws\030\002 \003(\0132\027.sysml.DocumentQueryRowR\004rows\"" +
+      "W\n\025RenderDocumentRequest\022\035\n\nmodel_hash\030\001" +
+      " \001(\tR\tmodelHash\022\037\n\013document_id\030\002 \001(\tR\ndo" +
+      "cumentId\"4\n\026RenderDocumentResponse\022\032\n\010ma" +
+      "rkdown\030\001 \001(\tR\010markdown*\223\001\n\rFailureReason" +
+      "\022\036\n\032FAILURE_REASON_UNSPECIFIED\020\000\022\035\n\031FAIL" +
+      "URE_REASON_EVALUATION\020\001\022\035\n\031FAILURE_REASO" +
+      "N_WRONG_KIND\020\002\022$\n FAILURE_REASON_AMBIGUO" +
+      "US_SUBJECT\020\003*\235\004\n\013EditFailure\022\034\n\030EDIT_FAI" +
+      "LURE_UNSPECIFIED\020\000\022\036\n\032EDIT_FAILURE_NO_OP" +
+      "ERATIONS\020\001\022\037\n\033EDIT_FAILURE_UNKNOWN_TARGE" +
+      "T\020\002\022!\n\035EDIT_FAILURE_AMBIGUOUS_TARGET\020\003\022\033" +
+      "\n\027EDIT_FAILURE_NOT_VALUED\020\004\022\036\n\032EDIT_FAIL" +
+      "URE_INVALID_VALUE\020\005\022\035\n\031EDIT_FAILURE_INVA" +
+      "LID_NAME\020\006\022\032\n\026EDIT_FAILURE_NOT_NAMED\020\007\022\"" +
+      "\n\036EDIT_FAILURE_RENAME_REFERENCED\020\010\022\"\n\036ED" +
+      "IT_FAILURE_OVERLAPPING_EDITS\020\t\022\037\n\033EDIT_F" +
+      "AILURE_RESULT_INVALID\020\n\022\036\n\032EDIT_FAILURE_" +
+      "OWNER_UNKNOWN\020\013\022$\n EDIT_FAILURE_OWNER_NO" +
+      "T_NAMESPACE\020\014\022\035\n\031EDIT_FAILURE_ILLEGAL_KI" +
+      "ND\020\r\022\"\n\036EDIT_FAILURE_MEMBER_NAME_TAKEN\020\016" +
+      "\022\"\n\036EDIT_FAILURE_DELETE_REFERENCED\020\017*\222\001\n" +
+      "\021PrimitiveOperator\022\"\n\036PRIMITIVE_OPERATOR" +
+      "_UNSPECIFIED\020\000\022\034\n\030PRIMITIVE_OPERATOR_EQU" +
+      "AL\020\001\022\036\n\032PRIMITIVE_OPERATOR_GREATER\020\002\022\033\n\027" +
+      "PRIMITIVE_OPERATOR_LESS\020\003*n\n\021CompositeOp" +
+      "erator\022\"\n\036COMPOSITE_OPERATOR_UNSPECIFIED" +
+      "\020\000\022\032\n\026COMPOSITE_OPERATOR_AND\020\001\022\031\n\025COMPOS" +
+      "ITE_OPERATOR_OR\020\0022\244\013\n\014SysMLService\022D\n\rGe" +
+      "tServerInfo\022\030.sysml.ServerInfoRequest\032\031." +
+      "sysml.ServerInfoResponse\022>\n\tParseFile\022\027." +
+      "sysml.ParseFileRequest\032\030.sysml.ParseFile" +
+      "Response\022G\n\014ParseSources\022\032.sysml.ParseSo" +
+      "urcesRequest\032\033.sysml.ParseSourcesRespons" +
+      "e\022;\n\tGetSymbol\022\027.sysml.GetSymbolRequest\032" +
+      "\025.sysml.SymbolResponse\022G\n\016GetDiagnostics" +
+      "\022\031.sysml.DiagnosticsRequest\032\032.sysml.Diag" +
+      "nosticsResponse\022;\n\010Evaluate\022\026.sysml.Eval" +
+      "uateRequest\032\027.sysml.EvaluateResponse\022D\n\013" +
+      "Instantiate\022\031.sysml.InstantiateRequest\032\032" +
+      ".sysml.InstantiateResponse\022J\n\rExecuteAct" +
+      "ion\022\033.sysml.ExecuteActionRequest\032\034.sysml" +
+      ".ExecuteActionResponse\022G\n\014ExecuteState\022\032" +
+      ".sysml.ExecuteStateRequest\032\033.sysml.Execu" +
+      "teStateResponse\0228\n\007Convert\022\025.sysml.Conve" +
+      "rtRequest\032\026.sysml.ConvertResponse\022A\n\nApp" +
+      "lyEdits\022\030.sysml.ApplyEditsRequest\032\031.sysm" +
+      "l.ApplyEditsResponse\022S\n\020VerifyConstraint" +
+      "\022\036.sysml.VerifyConstraintRequest\032\037.sysml" +
+      ".VerifyConstraintResponse\022V\n\021VerifyRequi" +
+      "rement\022\037.sysml.VerifyRequirementRequest\032" +
+      " .sysml.VerifyRequirementResponse\022Y\n\022Ver" +
+      "ifySatisfaction\022 .sysml.VerifySatisfacti" +
+      "onRequest\032!.sysml.VerifySatisfactionResp" +
+      "onse\022G\n\014EvaluateCalc\022\032.sysml.EvaluateCal" +
+      "cRequest\032\033.sysml.EvaluateCalcResponse\022D\n" +
+      "\013RunAnalysis\022\031.sysml.RunAnalysisRequest\032" +
+      "\032.sysml.RunAnalysisResponse\022;\n\010RunSweep\022" +
+      "\026.sysml.RunSweepRequest\032\027.sysml.RunSweep" +
+      "Response\0222\n\005Query\022\023.sysml.QueryRequest\032\024" +
+      ".sysml.QueryResponse\022S\n\020RunDocumentQuery",
+      "\022\036.sysml.RunDocumentQueryRequest\032\037.sysml" +
+      ".RunDocumentQueryResponse\022M\n\016RenderDocum" +
+      "ent\022\034.sysml.RenderDocumentRequest\032\035.sysm" +
+      "l.RenderDocumentResponseBJ\n\034org.openmbee" +
+      ".opensysml.protoP\001Z(github.com/Open-MBEE" +
+      "/OpenSysML/api/protob\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
@@ -1296,7 +1296,7 @@ public static void registerAllExtensions(
     internal_static_sysml_Diagnostic_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessage.FieldAccessorTable(
         internal_static_sysml_Diagnostic_descriptor,
-        new java.lang.String[] { "Severity", "Message", "Span", });
+        new java.lang.String[] { "Severity", "Message", "Span", "Code", });
     internal_static_sysml_Span_descriptor =
       getDescriptor().getMessageType(60);
     internal_static_sysml_Span_fieldAccessorTable = new
diff --git a/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/ApiIntegrationTest.java b/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/ApiIntegrationTest.java
index 1e78196c1..e8240bd68 100644
--- a/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/ApiIntegrationTest.java
+++ b/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/ApiIntegrationTest.java
@@ -288,6 +288,13 @@ void aParseThatFindsErrorsReportsThemAsDiagnosticsRatherThanARefusal() {
     assertEquals(diagnostics, model.diagnostics());
   }
 
+  @Test
+  void theServiceAdvertisesTheDiagnosticCodesItPopulates() {
+    assertTrue(connection.capabilities().has(Capabilities.DIAGNOSTIC_CODES));
+    Model model = connection.parse("package P { part def W { part hub : Missing; } }");
+    assertTrue(model.diagnostics().stream().anyMatch(d -> "unresolved".equals(d.code())));
+  }
+
   @Test
   void aJsonBodyAnswersWhatAProtobufBodyAnswers() {
     try (Connection json =
diff --git a/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/PublicTypesTest.java b/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/PublicTypesTest.java
index 6e98d16c0..90cd4748e 100644
--- a/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/PublicTypesTest.java
+++ b/clients/java/opensysml-client/src/test/java/org/openmbee/opensysml/PublicTypesTest.java
@@ -17,6 +17,7 @@
 import java.util.Map;
 import java.util.Optional;
 import org.junit.jupiter.api.Test;
+import org.openmbee.opensysml.internal.Protos;
 
 /** The public value types: immutable, comparable by value, and free of generated types. */
 class PublicTypesTest {
@@ -119,6 +120,27 @@ void diagnosticSeverityReadsTheWireName() {
     assertEquals(Diagnostic.Severity.UNKNOWN, Diagnostic.Severity.fromWireName(""));
   }
 
+  @Test
+  void diagnosticCarriesTheWireCode() {
+    List<Diagnostic> read =
+        Protos.diagnostics(
+            List.of(
+                org.openmbee.opensysml.proto.Diagnostic.newBuilder()
+                    .setSeverity("info")
+                    .setMessage("choice point: 2 steppable tokens")
+                    .setCode("choice-point")
+                    .build(),
+                org.openmbee.opensysml.proto.Diagnostic.newBuilder()
+                    .setSeverity("error")
+                    .setMessage("uncoded")
+                    .build()));
+    assertEquals("choice-point", read.get(0).code());
+    assertEquals("", read.get(1).code());
+    assertThrows(
+        NullPointerException.class,
+        () -> new Diagnostic(Diagnostic.Severity.ERROR, "m", null, Optional.empty()));
+  }
+
   @Test
   void aModelExceptionPreservesDiagnosticsWhenSerialized() throws Exception {
     List<Diagnostic> diagnostics =
@@ -126,8 +148,9 @@ void aModelExceptionPreservesDiagnosticsWhenSerialized() throws Exception {
             new Diagnostic(
                 Diagnostic.Severity.ERROR,
                 "invalid model",
+                "unresolved",
                 Optional.of(new Diagnostic.Span("model.sysml", 2, 3, 2, 8))),
-            new Diagnostic(Diagnostic.Severity.WARNING, "unlocated", Optional.empty()));
+            new Diagnostic(Diagnostic.Severity.WARNING, "unlocated", "", Optional.empty()));
     ModelException original = new ModelException("rejected", diagnostics);
 
     ByteArrayOutputStream bytes = new ByteArrayOutputStream();
diff --git a/clients/java/opensysml-conformance/src/main/java/org/openmbee/opensysml/conformance/Rendering.java b/clients/java/opensysml-conformance/src/main/java/org/openmbee/opensysml/conformance/Rendering.java
index 8430d77c4..8166c373d 100644
--- a/clients/java/opensysml-conformance/src/main/java/org/openmbee/opensysml/conformance/Rendering.java
+++ b/clients/java/opensysml-conformance/src/main/java/org/openmbee/opensysml/conformance/Rendering.java
@@ -144,7 +144,8 @@ private static org.openmbee.opensysml.proto.Diagnostic diagnostic(Diagnostic dia
     org.openmbee.opensysml.proto.Diagnostic.Builder builder =
         org.openmbee.opensysml.proto.Diagnostic.newBuilder()
             .setSeverity(diagnostic.severity().wireName())
-            .setMessage(diagnostic.message());
+            .setMessage(diagnostic.message())
+            .setCode(diagnostic.code());
     diagnostic
         .span()
         .ifPresent(
diff --git a/clients/node/README.md b/clients/node/README.md
index d500b1af2..0c0e3aac5 100644
--- a/clients/node/README.md
+++ b/clients/node/README.md
@@ -214,7 +214,12 @@ try {
 ```
 
 Source that does not parse is not a failure: `load`/`loads` return a model whose
-`hasErrors` is true and whose `diagnostics` say where. Options that cannot work
+`hasErrors` is true and whose `diagnostics` say where. Each `ModelDiagnostic` has
+`severity`, `message`, `code` and an optional location; branch on `code`
+(`"syntax"`, a validation code such as `"unresolved"`, `"choice-point"`,
+`"guard-unevaluable"`; `""` when the service assigned none), not on the message
+text. A service that populates `code` advertises `CAPABILITY_DIAGNOSTIC_CODES`;
+without it every code is `""`. Options that cannot work
 (an encoding that is not one, a timeout that cannot elapse, `grpc` with `json`)
 are refused before a connection is opened or a service started.
 
diff --git a/clients/node/src/core/capabilities.ts b/clients/node/src/core/capabilities.ts
index 2b7ad68f1..85053090d 100644
--- a/clients/node/src/core/capabilities.ts
+++ b/clients/node/src/core/capabilities.ts
@@ -26,6 +26,8 @@ export const CAPABILITY_MEASUREMENT_REFS = "measurement_refs";
 export const CAPABILITY_FUNCTION_VALUES = "function_values";
 /** The unbounded value `*` as `Value.infinity`, rather than an unsupported null. */
 export const CAPABILITY_INFINITY_VALUE = "infinity_value";
+/** `Diagnostic.code` is populated, so an empty code is a finding none was assigned. */
+export const CAPABILITY_DIAGNOSTIC_CODES = "diagnostic_codes";
 /** `ParseFileRequest.language`, which declares the language of inline content. */
 export const CAPABILITY_INLINE_LANGUAGE = "inline_language";
 /** `ParseFileRequest.strict_conformance`. */
diff --git a/clients/node/src/core/errors.ts b/clients/node/src/core/errors.ts
index 97f845333..daee94a95 100644
--- a/clients/node/src/core/errors.ts
+++ b/clients/node/src/core/errors.ts
@@ -85,6 +85,9 @@ export class ParseError extends OpenSysMLError {
 export interface ModelDiagnostic {
   severity: string;
   message: string;
+  /** What was found, stable across message wording (`"syntax"`, a validation code,
+   * `"choice-point"`, `"guard-unevaluable"`); `""` when the service assigned none. */
+  code: string;
   file?: string;
   startLine?: number;
   startColumn?: number;
diff --git a/clients/node/src/core/index.ts b/clients/node/src/core/index.ts
index da1e56e26..d2703effe 100644
--- a/clients/node/src/core/index.ts
+++ b/clients/node/src/core/index.ts
@@ -25,6 +25,7 @@ export {
   CAPABILITY_APPLY_EDITS,
   CAPABILITY_COMPLEX_VALUES,
   CAPABILITY_CONVERT,
+  CAPABILITY_DIAGNOSTIC_CODES,
   CAPABILITY_ENUM_VALUES,
   CAPABILITY_EVALUATE_SUBJECT,
   CAPABILITY_FEATURE_VALUES,
diff --git a/clients/node/src/core/model.ts b/clients/node/src/core/model.ts
index ac307eaa7..e5aa9973f 100644
--- a/clients/node/src/core/model.ts
+++ b/clients/node/src/core/model.ts
@@ -477,6 +477,7 @@ function decodeDiagnostic(diagnostic: Diagnostic): ModelDiagnostic {
   return {
     severity: diagnostic.severity,
     message: diagnostic.message,
+    code: diagnostic.code,
     ...(span === undefined
       ? {}
       : {
diff --git a/clients/node/src/generated/sysml_pb.ts b/clients/node/src/generated/sysml_pb.ts
index 2079572ab..edcdc9e98 100644
--- a/clients/node/src/generated/sysml_pb.ts
+++ b/clients/node/src/generated/sysml_pb.ts
@@ -10,7 +10,7 @@ import type { Message } from "@bufbuild/protobuf";
  * Describes the file sysml.proto.
  */
 export const file_sysml: GenFile = /*@__PURE__*/
-  fileDesc("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+  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");
 
 /**
  * Verdict is one verification's answer: whether the condition held, and, when
@@ -2520,6 +2520,14 @@ export type Diagnostic = Message<"sysml.Diagnostic"> & {
    * @generated from field: sysml.Span span = 3;
    */
   span?: Span | undefined;
+
+  /**
+   * Stable identifier to branch on instead of the message: a pass or rule code,
+   * "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+   *
+   * @generated from field: string code = 4;
+   */
+  code: string;
 };
 
 /**
@@ -2654,6 +2662,8 @@ export type ServerInfoResponse = Message<"sysml.ServerInfoResponse"> & {
    *                  and answers with typed rows.
    *   "render_document" - the RenderDocument RPC renders a named document to
    *                  Markdown.
+   *   "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+   *                  finding none was assigned; without it every code is empty.
    *
    * @generated from field: repeated string capabilities = 2;
    */
diff --git a/clients/node/test/client.test.ts b/clients/node/test/client.test.ts
index 4e5b0970d..91569a67e 100644
--- a/clients/node/test/client.test.ts
+++ b/clients/node/test/client.test.ts
@@ -9,6 +9,7 @@ import { join } from "node:path";
 import { after, before, test } from "node:test";
 import {
   CAPABILITY_COMPLEX_VALUES,
+  CAPABILITY_DIAGNOSTIC_CODES,
   CAPABILITY_FUNCTION_VALUES,
   CAPABILITY_MEASUREMENT_REFS,
   CAPABILITY_QUERY,
@@ -269,6 +270,18 @@ test("a file parses, and a syntax error is a diagnostic, not a thrown call", asy
   assert.ok(broken.diagnostics.some((diagnostic) => diagnostic.severity === "error"));
 });
 
+test("a diagnostic carries the service's code for what it found", async () => {
+  await using connection = await connect();
+  assert.ok((await connection.serverInfo()).has(CAPABILITY_DIAGNOSTIC_CODES));
+  const broken = await connection.loads("package Broken { part def }");
+  assert.ok(broken.diagnostics.length > 0);
+  assert.ok(broken.diagnostics.every((diagnostic) => diagnostic.code === "syntax"));
+
+  const unresolved = await connection.loads("package P { part def W { part hub : Missing; } }");
+  assert.ok(unresolved.diagnostics.some((diagnostic) => diagnostic.code === "unresolved"));
+  assert.ok(unresolved.diagnostics.every((diagnostic) => diagnostic.code !== ""));
+});
+
 test("an evaluation that cannot be made is an error the caller can catch", async () => {
   await using model = await loads(SAMPLE);
   await assert.rejects(() => model.eval("1 +"), EvaluationError);
diff --git a/clients/python/README.md b/clients/python/README.md
index 3ce024224..78f617401 100644
--- a/clients/python/README.md
+++ b/clients/python/README.md
@@ -238,6 +238,20 @@ connector usages — `action`, `state`, `calc`, `constraint`, `requirement`,
 so a generated class has no member for them; reach them through
 `model["Demo::Vehicle"]`, `verify_constraint` and `verify_satisfaction`.
 
+## Diagnostics
+
+A `Diagnostic` has `severity`, `message`, `code` and a location (`file`,
+`start_line`, `start_column`, `end_line`, `end_column`, or the raw `span`). Branch
+on `code`, not on the message text: `"syntax"` for a syntax error, a validation
+code such as `"unresolved"` for a finding, `"choice-point"` and
+`"guard-unevaluable"` for a run's notes; `""` when the service assigned none. A service
+that populates `code` advertises `CAPABILITY_DIAGNOSTIC_CODES`; without it every code is `""`.
+
+```python
+model = opensysml.load("model.sysml")
+unresolved = [d for d in model.diagnostics if d.code == "unresolved"]
+```
+
 ## Names that shadow builtins
 
 Neither builtin name is a live part of the API any more: the module-level
diff --git a/clients/python/opensysml/capabilities.py b/clients/python/opensysml/capabilities.py
index 2948d179f..09882a0be 100644
--- a/clients/python/opensysml/capabilities.py
+++ b/clients/python/opensysml/capabilities.py
@@ -120,6 +120,10 @@
 #: with ``UNIMPLEMENTED``.
 CAPABILITY_INFINITY_VALUE = "infinity_value"
 
+#: ``Diagnostic.code`` populated, read as :attr:`~opensysml.diagnostic.Diagnostic.code`,
+#: so an empty code is a finding none was assigned. Without it every code is empty.
+CAPABILITY_DIAGNOSTIC_CODES = "diagnostic_codes"
+
 
 @dataclass(frozen=True)
 class ServerInfo:
diff --git a/clients/python/opensysml/diagnostic.py b/clients/python/opensysml/diagnostic.py
index fbdd5356b..c95b1b393 100644
--- a/clients/python/opensysml/diagnostic.py
+++ b/clients/python/opensysml/diagnostic.py
@@ -7,6 +7,8 @@ class Diagnostic:
     Attributes:
         severity (str): Diagnostic severity (e.g., "error", "warning")
         message (str): Diagnostic message
+        code (str): Stable identifier of what was found (a validation code,
+            "syntax", "choice-point", "guard-unevaluable"); "" when none
         file (str): Source file name
         start_line (int): Starting line number (1-based)
         start_column (int): Starting column number (1-based)
@@ -33,6 +35,11 @@ def message(self):
         """Get diagnostic message."""
         return self._pb.message
     
+    @property
+    def code(self):
+        """Get the diagnostic code, independent of the message wording."""
+        return self._pb.code
+    
     @property
     def span(self):
         """Get protobuf Span object."""
@@ -75,6 +82,7 @@ def __repr__(self):
         return (
             f"Diagnostic(severity={self.severity!r}, "
             f"message={self.message!r}, "
+            f"code={self.code!r}, "
             f"file={self.file!r}, "
             f"line={self.start_line})"
         )
diff --git a/clients/python/opensysml/proto/sysml_pb2.py b/clients/python/opensysml/proto/sysml_pb2.py
index 4b0e92de3..7e4499f1e 100644
--- a/clients/python/opensysml/proto/sysml_pb2.py
+++ b/clients/python/opensysml/proto/sysml_pb2.py
@@ -24,7 +24,7 @@
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0bsysml.proto\x12\x05sysml\"\xe2\x01\n\x07Verdict\x12\x0c\n\x04kind\x18\x01 \x01(\t\x12\x12\n\nelement_id\x18\x02 \x01(\t\x12\x0f\n\x07\x65lement\x18\x03 \x01(\t\x12\r\n\x05holds\x18\x04 \x01(\x08\x12\x11\n\tcondition\x18\x05 \x01(\t\x12\x13\n\x0binstance_id\x18\x06 \x01(\x03\x12\x18\n\x10instance_type_id\x18\x07 \x01(\t\x12\r\n\x05\x65rror\x18\x08 \x01(\t\x12,\n\x0e\x66\x61ilure_reason\x18\t \x01(\x0e\x32\x14.sysml.FailureReason\x12\x16\n\x0erequirement_id\x18\n \x01(\t\"[\n\x17VerifyConstraintRequest\x12\x12\n\nmodel_hash\x18\x01 \x01(\t\x12\x11\n\tsymbol_id\x18\x02 \x01(\t\x12\x19\n\x11subject_symbol_id\x18\x03 \x01(\t\"\x96\x01\n\x18VerifyConstraintResponse\x12\x1f\n\x07verdict\x18\x01 \x01(\x0b\x32\x0e.sysml.Verdict\x12\"\n\tinstances\x18\x02 \x03(\x0b\x32\x0f.sysml.Instance\x12\r\n\x05\x65rror\x18\x03 \x01(\t\x12&\n\x0b\x64iagnostics\x18\x04 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.sysml.VerifyRequirementResponse\x12Y\n\x12VerifySatisfaction\x12 .sysml.VerifySatisfactionRequest\x1a!.sysml.VerifySatisfactionResponse\x12G\n\x0c\x45valuateCalc\x12\x1a.sysml.EvaluateCalcRequest\x1a\x1b.sysml.EvaluateCalcResponse\x12\x44\n\x0bRunAnalysis\x12\x19.sysml.RunAnalysisRequest\x1a\x1a.sysml.RunAnalysisResponse\x12;\n\x08RunSweep\x12\x16.sysml.RunSweepRequest\x1a\x17.sysml.RunSweepResponse\x12\x32\n\x05Query\x12\x13.sysml.QueryRequest\x1a\x14.sysml.QueryResponse\x12S\n\x10RunDocumentQuery\x12\x1e.sysml.RunDocumentQueryRequest\x1a\x1f.sysml.RunDocumentQueryResponse\x12M\n\x0eRenderDocument\x12\x1c.sysml.RenderDocumentRequest\x1a\x1d.sysml.RenderDocumentResponseB*Z(github.com/Open-MBEE/OpenSysML/api/protob\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -50,14 +50,14 @@
   _globals['_QUERYRESULTELEMENT_PROPERTIESENTRY']._serialized_options = b'8\001'
   _globals['_RUNSWEEPREQUEST_NAMEDARGUMENTSENTRY']._loaded_options = None
   _globals['_RUNSWEEPREQUEST_NAMEDARGUMENTSENTRY']._serialized_options = b'8\001'
-  _globals['_FAILUREREASON']._serialized_start=10411
-  _globals['_FAILUREREASON']._serialized_end=10558
-  _globals['_EDITFAILURE']._serialized_start=10561
-  _globals['_EDITFAILURE']._serialized_end=11102
-  _globals['_PRIMITIVEOPERATOR']._serialized_start=11105
-  _globals['_PRIMITIVEOPERATOR']._serialized_end=11251
-  _globals['_COMPOSITEOPERATOR']._serialized_start=11253
-  _globals['_COMPOSITEOPERATOR']._serialized_end=11363
+  _globals['_FAILUREREASON']._serialized_start=10425
+  _globals['_FAILUREREASON']._serialized_end=10572
+  _globals['_EDITFAILURE']._serialized_start=10575
+  _globals['_EDITFAILURE']._serialized_end=11116
+  _globals['_PRIMITIVEOPERATOR']._serialized_start=11119
+  _globals['_PRIMITIVEOPERATOR']._serialized_end=11265
+  _globals['_COMPOSITEOPERATOR']._serialized_start=11267
+  _globals['_COMPOSITEOPERATOR']._serialized_end=11377
   _globals['_VERDICT']._serialized_start=23
   _globals['_VERDICT']._serialized_end=249
   _globals['_VERIFYCONSTRAINTREQUEST']._serialized_start=251
@@ -189,57 +189,57 @@
   _globals['_UNITFACTOR']._serialized_start=7664
   _globals['_UNITFACTOR']._serialized_end=7711
   _globals['_DIAGNOSTIC']._serialized_start=7713
-  _globals['_DIAGNOSTIC']._serialized_end=7787
-  _globals['_SPAN']._serialized_start=7789
-  _globals['_SPAN']._serialized_end=7883
-  _globals['_SERVERINFOREQUEST']._serialized_start=7885
-  _globals['_SERVERINFOREQUEST']._serialized_end=7904
-  _globals['_SERVERINFORESPONSE']._serialized_start=7906
-  _globals['_SERVERINFORESPONSE']._serialized_end=7965
-  _globals['_QUERYREQUEST']._serialized_start=7967
-  _globals['_QUERYREQUEST']._serialized_end=8050
-  _globals['_QUERYRESPONSE']._serialized_start=8052
-  _globals['_QUERYRESPONSE']._serialized_end=8112
-  _globals['_QUERY']._serialized_start=8114
-  _globals['_QUERY']._serialized_end=8186
-  _globals['_CONSTRAINT']._serialized_start=8188
-  _globals['_CONSTRAINT']._serialized_end=8312
-  _globals['_PRIMITIVECONSTRAINT']._serialized_start=8314
-  _globals['_PRIMITIVECONSTRAINT']._serialized_end=8429
-  _globals['_COMPOSITECONSTRAINT']._serialized_start=8431
-  _globals['_COMPOSITECONSTRAINT']._serialized_end=8535
-  _globals['_QUERYRESULTELEMENT']._serialized_start=8538
-  _globals['_QUERYRESULTELEMENT']._serialized_end=8698
-  _globals['_QUERYRESULTELEMENT_PROPERTIESENTRY']._serialized_start=8649
-  _globals['_QUERYRESULTELEMENT_PROPERTIESENTRY']._serialized_end=8698
-  _globals['_SWEEPRANGE']._serialized_start=8700
-  _globals['_SWEEPRANGE']._serialized_end=8815
-  _globals['_RUNSWEEPREQUEST']._serialized_start=8818
-  _globals['_RUNSWEEPREQUEST']._serialized_end=9138
+  _globals['_DIAGNOSTIC']._serialized_end=7801
+  _globals['_SPAN']._serialized_start=7803
+  _globals['_SPAN']._serialized_end=7897
+  _globals['_SERVERINFOREQUEST']._serialized_start=7899
+  _globals['_SERVERINFOREQUEST']._serialized_end=7918
+  _globals['_SERVERINFORESPONSE']._serialized_start=7920
+  _globals['_SERVERINFORESPONSE']._serialized_end=7979
+  _globals['_QUERYREQUEST']._serialized_start=7981
+  _globals['_QUERYREQUEST']._serialized_end=8064
+  _globals['_QUERYRESPONSE']._serialized_start=8066
+  _globals['_QUERYRESPONSE']._serialized_end=8126
+  _globals['_QUERY']._serialized_start=8128
+  _globals['_QUERY']._serialized_end=8200
+  _globals['_CONSTRAINT']._serialized_start=8202
+  _globals['_CONSTRAINT']._serialized_end=8326
+  _globals['_PRIMITIVECONSTRAINT']._serialized_start=8328
+  _globals['_PRIMITIVECONSTRAINT']._serialized_end=8443
+  _globals['_COMPOSITECONSTRAINT']._serialized_start=8445
+  _globals['_COMPOSITECONSTRAINT']._serialized_end=8549
+  _globals['_QUERYRESULTELEMENT']._serialized_start=8552
+  _globals['_QUERYRESULTELEMENT']._serialized_end=8712
+  _globals['_QUERYRESULTELEMENT_PROPERTIESENTRY']._serialized_start=8663
+  _globals['_QUERYRESULTELEMENT_PROPERTIESENTRY']._serialized_end=8712
+  _globals['_SWEEPRANGE']._serialized_start=8714
+  _globals['_SWEEPRANGE']._serialized_end=8829
+  _globals['_RUNSWEEPREQUEST']._serialized_start=8832
+  _globals['_RUNSWEEPREQUEST']._serialized_end=9152
   _globals['_RUNSWEEPREQUEST_NAMEDARGUMENTSENTRY']._serialized_start=1782
   _globals['_RUNSWEEPREQUEST_NAMEDARGUMENTSENTRY']._serialized_end=1849
-  _globals['_SWEEPROW']._serialized_start=9141
-  _globals['_SWEEPROW']._serialized_end=9341
-  _globals['_RUNSWEEPRESPONSE']._serialized_start=9344
-  _globals['_RUNSWEEPRESPONSE']._serialized_end=9581
-  _globals['_RUNDOCUMENTQUERYREQUEST']._serialized_start=9583
-  _globals['_RUNDOCUMENTQUERYREQUEST']._serialized_end=9693
-  _globals['_DOCUMENTQUERYBINDING']._serialized_start=9695
-  _globals['_DOCUMENTQUERYBINDING']._serialized_end=9774
-  _globals['_DOCUMENTVALUE']._serialized_start=9777
-  _globals['_DOCUMENTVALUE']._serialized_end=9990
-  _globals['_DOCUMENTQUERYCOLUMN']._serialized_start=9992
-  _globals['_DOCUMENTQUERYCOLUMN']._serialized_end=10027
-  _globals['_DOCUMENTQUERYCELL']._serialized_start=10029
-  _globals['_DOCUMENTQUERYCELL']._serialized_end=10086
-  _globals['_DOCUMENTQUERYROW']._serialized_start=10088
-  _globals['_DOCUMENTQUERYROW']._serialized_end=10186
-  _globals['_RUNDOCUMENTQUERYRESPONSE']._serialized_start=10188
-  _globals['_RUNDOCUMENTQUERYRESPONSE']._serialized_end=10298
-  _globals['_RENDERDOCUMENTREQUEST']._serialized_start=10300
-  _globals['_RENDERDOCUMENTREQUEST']._serialized_end=10364
-  _globals['_RENDERDOCUMENTRESPONSE']._serialized_start=10366
-  _globals['_RENDERDOCUMENTRESPONSE']._serialized_end=10408
-  _globals['_SYSMLSERVICE']._serialized_start=11366
-  _globals['_SYSMLSERVICE']._serialized_end=12810
+  _globals['_SWEEPROW']._serialized_start=9155
+  _globals['_SWEEPROW']._serialized_end=9355
+  _globals['_RUNSWEEPRESPONSE']._serialized_start=9358
+  _globals['_RUNSWEEPRESPONSE']._serialized_end=9595
+  _globals['_RUNDOCUMENTQUERYREQUEST']._serialized_start=9597
+  _globals['_RUNDOCUMENTQUERYREQUEST']._serialized_end=9707
+  _globals['_DOCUMENTQUERYBINDING']._serialized_start=9709
+  _globals['_DOCUMENTQUERYBINDING']._serialized_end=9788
+  _globals['_DOCUMENTVALUE']._serialized_start=9791
+  _globals['_DOCUMENTVALUE']._serialized_end=10004
+  _globals['_DOCUMENTQUERYCOLUMN']._serialized_start=10006
+  _globals['_DOCUMENTQUERYCOLUMN']._serialized_end=10041
+  _globals['_DOCUMENTQUERYCELL']._serialized_start=10043
+  _globals['_DOCUMENTQUERYCELL']._serialized_end=10100
+  _globals['_DOCUMENTQUERYROW']._serialized_start=10102
+  _globals['_DOCUMENTQUERYROW']._serialized_end=10200
+  _globals['_RUNDOCUMENTQUERYRESPONSE']._serialized_start=10202
+  _globals['_RUNDOCUMENTQUERYRESPONSE']._serialized_end=10312
+  _globals['_RENDERDOCUMENTREQUEST']._serialized_start=10314
+  _globals['_RENDERDOCUMENTREQUEST']._serialized_end=10378
+  _globals['_RENDERDOCUMENTRESPONSE']._serialized_start=10380
+  _globals['_RENDERDOCUMENTRESPONSE']._serialized_end=10422
+  _globals['_SYSMLSERVICE']._serialized_start=11380
+  _globals['_SYSMLSERVICE']._serialized_end=12824
 # @@protoc_insertion_point(module_scope)
diff --git a/clients/python/opensysml/proto/sysml_pb2.pyi b/clients/python/opensysml/proto/sysml_pb2.pyi
index a282991ae..84d3e21c1 100644
--- a/clients/python/opensysml/proto/sysml_pb2.pyi
+++ b/clients/python/opensysml/proto/sysml_pb2.pyi
@@ -816,14 +816,16 @@ class UnitFactor(_message.Message):
     def __init__(self, unit_id: _Optional[str] = ..., exponent: _Optional[float] = ...) -> None: ...
 
 class Diagnostic(_message.Message):
-    __slots__ = ("severity", "message", "span")
+    __slots__ = ("severity", "message", "span", "code")
     SEVERITY_FIELD_NUMBER: _ClassVar[int]
     MESSAGE_FIELD_NUMBER: _ClassVar[int]
     SPAN_FIELD_NUMBER: _ClassVar[int]
+    CODE_FIELD_NUMBER: _ClassVar[int]
     severity: str
     message: str
     span: Span
-    def __init__(self, severity: _Optional[str] = ..., message: _Optional[str] = ..., span: _Optional[_Union[Span, _Mapping]] = ...) -> None: ...
+    code: str
+    def __init__(self, severity: _Optional[str] = ..., message: _Optional[str] = ..., span: _Optional[_Union[Span, _Mapping]] = ..., code: _Optional[str] = ...) -> None: ...
 
 class Span(_message.Message):
     __slots__ = ("file", "start_line", "start_col", "end_line", "end_col")
diff --git a/clients/python/tests/test_diagnostic.py b/clients/python/tests/test_diagnostic.py
index 2e2993a92..3835646f6 100644
--- a/clients/python/tests/test_diagnostic.py
+++ b/clients/python/tests/test_diagnostic.py
@@ -66,3 +66,16 @@ def test_diagnostic_span_property():
     # span property returns the protobuf Span object
     assert diag.span == pb_span
     assert diag.span.file == "test.sysml"
+
+
+def test_diagnostic_code():
+    coded = Diagnostic(sysml_pb2.Diagnostic(
+        severity="info",
+        message="choice point: 2 steppable tokens",
+        code="choice-point",
+    ))
+    uncoded = Diagnostic(sysml_pb2.Diagnostic(severity="error", message="expected '}'"))
+
+    assert coded.code == "choice-point"
+    assert "code='choice-point'" in repr(coded)
+    assert uncoded.code == ""
diff --git a/clients/python/tests/test_runtime_integration.py b/clients/python/tests/test_runtime_integration.py
index 221ab6fe2..f281338a6 100644
--- a/clients/python/tests/test_runtime_integration.py
+++ b/clients/python/tests/test_runtime_integration.py
@@ -212,6 +212,14 @@ def test_enum_typed_slot_and_eval_return_the_literal(self):
         assert self.conn.eval("D::Color::red", model.hash) == red
         assert self.conn.eval("D::Color::green", model.hash) != red
 
+    def test_service_reports_the_diagnostic_codes_capability(self):
+        """The service says it populates Diagnostic.code, and does."""
+        from opensysml.capabilities import CAPABILITY_DIAGNOSTIC_CODES
+
+        assert self.conn.server_info().has(CAPABILITY_DIAGNOSTIC_CODES)
+        model = self.conn.load_from_content("package P { part def W { part hub : Missing; } }")
+        assert "unresolved" in {d.code for d in model.diagnostics}
+
     def test_service_reports_the_enum_values_capability(self):
         """The wire form is a contract, so the service says it honours it."""
         from opensysml.capabilities import CAPABILITY_ENUM_VALUES
diff --git a/clients/rust/conformance/sysml.descriptor.binpb b/clients/rust/conformance/sysml.descriptor.binpb
index bf4c1e2da..607ad1cd6 100644
Binary files a/clients/rust/conformance/sysml.descriptor.binpb and b/clients/rust/conformance/sysml.descriptor.binpb differ
diff --git a/clients/rust/opensysml/src/domain.rs b/clients/rust/opensysml/src/domain.rs
index b1b7c5662..3049715e0 100644
--- a/clients/rust/opensysml/src/domain.rs
+++ b/clients/rust/opensysml/src/domain.rs
@@ -134,6 +134,9 @@ pub struct Diagnostic {
     pub severity: String,
     /// Human-readable diagnostic message.
     pub message: String,
+    /// What was found, stable across message wording: `syntax`, a validation
+    /// code, `choice-point` or `guard-unevaluable`; empty when the service assigned none.
+    pub code: String,
     /// Optional source location.
     pub span: Option<Span>,
     wire: wire::Diagnostic,
@@ -145,6 +148,7 @@ impl From<wire::Diagnostic> for Diagnostic {
         Self {
             severity: wire.severity.clone(),
             message: wire.message.clone(),
+            code: wire.code.clone(),
             span,
             wire,
         }
@@ -882,6 +886,25 @@ impl Instantiation {
 mod tests {
     use super::*;
 
+    #[test]
+    fn a_diagnostic_carries_its_code() {
+        let coded = Diagnostic::from(wire::Diagnostic {
+            severity: "info".to_owned(),
+            message: "choice point: 2 steppable tokens".to_owned(),
+            code: "choice-point".to_owned(),
+            span: None,
+        });
+        assert_eq!(coded.code, "choice-point");
+        assert_eq!(coded.wire().code, "choice-point");
+
+        let uncoded = Diagnostic::from(wire::Diagnostic {
+            severity: "error".to_owned(),
+            message: "expected '}'".to_owned(),
+            ..Default::default()
+        });
+        assert_eq!(uncoded.code, "");
+    }
+
     #[test]
     fn value_arms_are_decoded_without_loss() {
         let sequence = wire::Value {
diff --git a/clients/rust/opensysml/src/proto/sysml/sysml.rs b/clients/rust/opensysml/src/proto/sysml/sysml.rs
index 89cf07971..073dfcef3 100644
--- a/clients/rust/opensysml/src/proto/sysml/sysml.rs
+++ b/clients/rust/opensysml/src/proto/sysml/sysml.rs
@@ -1046,6 +1046,10 @@ pub struct Diagnostic {
     pub message: ::prost::alloc::string::String,
     #[prost(message, optional, tag="3")]
     pub span: ::core::option::Option<Span>,
+    /// Stable identifier to branch on instead of the message: a pass or rule code,
+    /// "syntax", "choice-point", "guard-unevaluable"; empty when none was assigned.
+    #[prost(string, tag="4")]
+    pub code: ::prost::alloc::string::String,
 }
 /// Span represents a source location
 #[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
@@ -1128,6 +1132,8 @@ pub struct ServerInfoResponse {
     ///                   and answers with typed rows.
     ///    "render_document" - the RenderDocument RPC renders a named document to
     ///                   Markdown.
+    ///    "diagnostic_codes" - Diagnostic.code is populated, so an empty code is a
+    ///                   finding none was assigned; without it every code is empty.
     #[prost(string, repeated, tag="2")]
     pub capabilities: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
 }
diff --git a/cmd/conformance/pkgclient.go b/cmd/conformance/pkgclient.go
index c2d9cbbfa..48a27f911 100644
--- a/cmd/conformance/pkgclient.go
+++ b/cmd/conformance/pkgclient.go
@@ -732,7 +732,7 @@ func symbolToProto(symbol *opensysml.Symbol) *pb.SymbolInfo {
 func diagnosticsToProto(diagnostics []opensysml.Diagnostic) []*pb.Diagnostic {
 	var out []*pb.Diagnostic
 	for _, diagnostic := range diagnostics {
-		converted := &pb.Diagnostic{Severity: diagnostic.Severity, Message: diagnostic.Message}
+		converted := &pb.Diagnostic{Severity: diagnostic.Severity, Message: diagnostic.Message, Code: diagnostic.Code}
 		if diagnostic.Span != nil {
 			// #nosec G115 -- line and column numbers fit in int32.
 			converted.Span = &pb.Span{
diff --git a/docs/reference/api.md b/docs/reference/api.md
index 4fbb031e7..5d537cd29 100644
--- a/docs/reference/api.md
+++ b/docs/reference/api.md
@@ -334,9 +334,11 @@ Higher tiers skip if lower tier fails.
   - `Model() *semantics.Model`
 
 - **`Diagnostic`** — Error/warning
-  - `Level DiagnosticLevel` — Error, Warning, Info
+  - `Severity Severity` — Error, Warning, Info
   - `Span source.Span`
   - `Message string`
+  - `Code string` — stable identifier of what was found (`syntax`, a pass or rule code,
+    `choice-point`, `guard-unevaluable`); carried as-is on the wire as `Diagnostic.code`
 
 **Usage:**
 ```go
diff --git a/docs/reference/service-transports.md b/docs/reference/service-transports.md
index 46a312f1b..30dc88408 100644
--- a/docs/reference/service-transports.md
+++ b/docs/reference/service-transports.md
@@ -52,7 +52,7 @@ capability's definition rather than something a client has to guess:
 | The capability describes | A request that needs it | What a client should do |
 |---|---|---|
 | what the service can be *asked*: `strict_conformance`, `inline_language`, `parse_sources`, `evaluate_subject`, `verification`, `convert`, `apply_edits`, `authoring`, `query`, `oslc_query`, `document_query`, `render_document` | is **refused** with `UNIMPLEMENTED`, naming the capability | check the advertised list first, and report the missing capability locally rather than spending a round trip |
-| how a response is *populated*: `type_facts`, `symbol_attributes`, `feature_values`, `enum_values`, `unset_value`, `complex_values`, `structured_values`, `measurement_refs`, `function_values`, `verification_verdicts`, `infinity_value` | is answered with those fields **omitted** | check before reading the fields; an omitted field is not an error |
+| how a response is *populated*: `type_facts`, `symbol_attributes`, `feature_values`, `enum_values`, `unset_value`, `complex_values`, `structured_values`, `measurement_refs`, `function_values`, `verification_verdicts`, `infinity_value`, `diagnostic_codes` | is answered with those fields **omitted** | check before reading the fields; an omitted field is not an error |
 
 `complex_values`, `structured_values`, `measurement_refs`, `function_values` and `infinity_value` sit in both
 rows: a complex — or an array, vector or vector quantity, a bare measurement reference, a calc held as a
diff --git a/docs/reference/wire-contract.md b/docs/reference/wire-contract.md
index 37fe8646d..306ae2ccf 100644
--- a/docs/reference/wire-contract.md
+++ b/docs/reference/wire-contract.md
@@ -65,7 +65,7 @@ same mapping, and three of its rules matter here:
 
 ```console
 $ … /Evaluate -d '{"modelHash":"2af52c50cee63699ece8f9021b6344e4fe9f2fe6eeb0f3f8edd9feaa5443dea2","expresion":"1 + 1"}'
-{"error":"expression parse failed","diagnostics":[{"severity":"error","message":"expected an expression","span":{"file":"<expression>","startLine":1,"startCol":1,"endLine":1,"endCol":1}}]}
+{"error":"expression parse failed","diagnostics":[{"severity":"error","message":"expected an expression","span":{"file":"<expression>","startLine":1,"startCol":1,"endLine":1,"endCol":1},"code":"syntax"}]}
 ```
 
 A body that is not valid JSON, by contrast, is refused with a Connect error (see
@@ -115,7 +115,7 @@ check `diagnostics` for `"severity":"error"` first:
 
 ```console
 $ … /ParseSources -d '{"documents":[{"name":"syntax_error.sysml","content":"package Test { invalid syntax ((( }\n"}]}'
-{"modelHash":"da0e2628154910330555183af59d8f803233352122b69f64da8ff138094f0c50","roots":[{"kind":"RootNamespace","childIds":["Test"]}],"diagnostics":[{"severity":"error","message":"expected a namespace member","span":{"file":"syntax_error.sysml","startLine":1,"startCol":16,"endLine":1,"endCol":23}}]}
+{"modelHash":"da0e2628154910330555183af59d8f803233352122b69f64da8ff138094f0c50","roots":[{"kind":"RootNamespace","childIds":["Test"]}],"diagnostics":[{"severity":"error","message":"expected a namespace member","span":{"file":"syntax_error.sysml","startLine":1,"startCol":16,"endLine":1,"endCol":23},"code":"syntax"}]}
 ```
 
 What *is* refused, with a Connect error, is a request the service cannot make a model from at
@@ -545,13 +545,31 @@ type-check, an action has no start, a value overflowed.
 ### Diagnostics: the shape of a finding
 
 ```json
-{"severity":"error","message":"expected a namespace member","span":{"file":"syntax_error.sysml","startLine":1,"startCol":16,"endLine":1,"endCol":23}}
+{"severity":"error","message":"expected a namespace member","span":{"file":"syntax_error.sysml","startLine":1,"startCol":16,"endLine":1,"endCol":23},"code":"syntax"}
 ```
 
-`severity` is `"error"`, `"warning"` or `"info"`. `span` locates it: `file` is the document's
-`name` from the request (or `<expression>` for an `Evaluate` expression), lines and columns are
-**1-based**, `end*` is exclusive, and the whole `span` is omitted when there is no location.
-Line and column are `int32`, so unlike `int64` they are JSON *numbers*.
+| Field | Type | Meaning |
+|---|---|---|
+| `severity` | string | `"error"`, `"warning"` or `"info"` |
+| `message` | string | The finding, worded for a person; may change between releases |
+| `span` | `Span` | Where it is; omitted when there is no location |
+| `code` | string | What it is, stable across wording; `""` when the producer assigned none |
+
+`span` locates it: `file` is the document's `name` from the request (or `<expression>` for an
+`Evaluate` expression), lines and columns are **1-based**, `end*` is exclusive, and the whole
+`span` is omitted when there is no location. Line and column are `int32`, so unlike `int64`
+they are JSON *numbers*.
+
+`code` is the identifier to branch on; `message` is not. A syntax error is `"syntax"`, whether
+it came from a document, an `Evaluate` expression, an edit's new value or a `Convert` input. A
+validation finding carries its pass or rule code, the same one the LSP reports as the
+diagnostic's code (`"unresolved"` for a name that resolves to nothing, for instance). A run's
+notes are `"choice-point"` and `"guard-unevaluable"` (see [`ExecuteAction`](#executeaction)).
+The field is a proto3 string, so a producer that assigns no code sends `""`, which the JSON
+encoding omits; treat a missing `code` as empty, never as an error. A service that populates
+the field advertises the `diagnostic_codes` capability; from one that does not, every `code` is
+empty and says nothing about the finding, so check the capability before branching on it. New
+codes may appear in a release; a code, once published, keeps its meaning.
 
 ### In-body failures
 
@@ -776,7 +794,7 @@ done; … }` with a succession from `split` to each branch and from each to `syn
 
 ```console
 $ … /ExecuteAction -d '{"modelHash":"81b1…73fc","actionSymbolId":"Test::tally"}'
-{"outputs":{"leftCount":{"intValue":"1"},"rightCount":{"intValue":"10"}},"diagnostics":[{"severity":"info","message":"choice point: step 3: tokens 2@left, 3@right (unordered; took 3@right first)","span":{"file":"tally.sysml","startLine":2,"startCol":2,"endLine":20,"endCol":2}}]}
+{"outputs":{"leftCount":{"intValue":"1"},"rightCount":{"intValue":"10"}},"diagnostics":[{"severity":"info","message":"choice point: step 3: tokens 2@left, 3@right (unordered; took 3@right first)","span":{"file":"tally.sysml","startLine":2,"startCol":2,"endLine":20,"endCol":2},"code":"choice-point"}]}
 ```
 
 A run with no `diagnostics` had exactly one order to take. The order taken is the engine's fixed
@@ -793,12 +811,14 @@ then warn; if 1 / (level - 75) > 0 then alarm; … }`):
 
 ```console
 $ … /ExecuteAction -d '{"modelHash":"81b1…73fc","actionSymbolId":"Test::route"}'
-{"outputs":{"level":{"intValue":"75"},"handler":{"intValue":"1"}},"diagnostics":[{"severity":"info","message":"guard not evaluable: step 2: decision select branch 2->alarm: division by zero (not selected)","span":{"file":"tally.sysml","startLine":31,"startCol":10,"endLine":31,"endCol":30}}]}
+{"outputs":{"level":{"intValue":"75"},"handler":{"intValue":"1"}},"diagnostics":[{"severity":"info","message":"guard not evaluable: step 2: decision select branch 2->alarm: division by zero (not selected)","span":{"file":"tally.sysml","startLine":31,"startCol":10,"endLine":31,"endCol":30},"code":"guard-unevaluable"}]}
 ```
 
 The first guard read is the run's own, not a preview: when it cannot be evaluated the run fails
 with `error` as it always has, and no `guard not evaluable` diagnostic is added. The two kinds are
-told apart by message prefix, `choice point: ` and `guard not evaluable: `; both are `"info"`.
+told apart by `code`, `"choice-point"` and `"guard-unevaluable"`; both are `"info"`, and the
+message prefixes `choice point: ` and `guard not evaluable: ` are for reading, not branching.
+`RunAnalysis` carries the same two codes for the runs it makes.
 
 ### `ExecuteState`
 
@@ -839,7 +859,7 @@ Idle accept Go then B; }` in the same document:
 
 ```console
 $ … /ExecuteState -d '{"modelHash":"81b1…73fc","stateMachineSymbolId":"Test::Hub","events":["Go"]}'
-{"statesVisited":["Idle","A"],"diagnostics":[{"severity":"info","message":"choice point: state Idle on accept Go: transitions 1->A, 2->B (unordered; took 1->A)","span":{"file":"tally.sysml","startLine":25,"startCol":3,"endLine":26,"endCol":3}}]}
+{"statesVisited":["Idle","A"],"diagnostics":[{"severity":"info","message":"choice point: state Idle on accept Go: transitions 1->A, 2->B (unordered; took 1->A)","span":{"file":"tally.sysml","startLine":25,"startCol":3,"endLine":26,"endCol":3},"code":"choice-point"}]}
 ```
 
 ### `EvaluateCalc`
diff --git a/internal/core/edit/validate.go b/internal/core/edit/validate.go
index 8dd3dd991..dcae14de0 100644
--- a/internal/core/edit/validate.go
+++ b/internal/core/edit/validate.go
@@ -138,7 +138,7 @@ func parseDiagnostics(diags []parser.Diagnostic) []passes.Diagnostic {
 			Severity: passes.SeverityError,
 			Span:     d.Span,
 			Message:  d.Message,
-			Code:     d.Code,
+			Code:     "syntax",
 			Source:   "syntax",
 		})
 	}
diff --git a/internal/grpc/analysis.go b/internal/grpc/analysis.go
index de57c4545..4dd7857d9 100644
--- a/internal/grpc/analysis.go
+++ b/internal/grpc/analysis.go
@@ -70,7 +70,7 @@ func (s *Service) RunAnalysis(ctx context.Context, req *pb.RunAnalysisRequest) (
 			return &pb.RunAnalysisResponse{
 				Error:         fmt.Sprintf("verification run failed: %v", verr),
 				FailureReason: failureReason(verr),
-				Diagnostics:   RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached),
+				Diagnostics:   v.service.filterDiagnosticCapabilities(RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached)),
 			}, nil
 		}
 		result = verified.Run
@@ -79,10 +79,10 @@ func (s *Service) RunAnalysis(ctx context.Context, req *pb.RunAnalysisRequest) (
 		return &pb.RunAnalysisResponse{
 			Error:         fmt.Sprintf("analysis run failed: %v", err),
 			FailureReason: failureReason(err),
-			Diagnostics:   RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached),
+			Diagnostics:   v.service.filterDiagnosticCapabilities(RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached)),
 		}, nil
 	}
-	diags := RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached)
+	diags := v.service.filterDiagnosticCapabilities(RunNoteDiagnosticsToProto(v.runtime.Notes(), v.cached))
 	// The case reports the subject it ran on: the one supplied, or the one the
 	// usage or the enclosing case bound.
 	subject = result.Subject
diff --git a/internal/grpc/capability_response.go b/internal/grpc/capability_response.go
index de9a0f0ab..dab040a50 100644
--- a/internal/grpc/capability_response.go
+++ b/internal/grpc/capability_response.go
@@ -58,6 +58,15 @@ func (s *Service) filterInstanceCapabilities(instance *pb.Instance) {
 	}
 }
 
+func (s *Service) filterDiagnosticCapabilities(diags []*pb.Diagnostic) []*pb.Diagnostic {
+	if !s.capabilities.has(CapabilityDiagnosticCodes) {
+		for _, diag := range diags {
+			diag.Code = ""
+		}
+	}
+	return diags
+}
+
 func (s *Service) filterValueCapabilities(value *pb.Value) {
 	if value == nil {
 		return
diff --git a/internal/grpc/convert.go b/internal/grpc/convert.go
index 62f3ee888..c9c5ee757 100644
--- a/internal/grpc/convert.go
+++ b/internal/grpc/convert.go
@@ -83,6 +83,7 @@ func DiagnosticToProto(diag passes.Diagnostic, sf *source.SourceFile) *pb.Diagno
 	return &pb.Diagnostic{
 		Severity: diag.Severity.String(),
 		Message:  diag.Message,
+		Code:     diag.Code,
 		Span: &pb.Span{
 			File:      sf.Name(),
 			StartLine: int32Clamp(start.Line),
@@ -108,12 +109,16 @@ func RunNoteDiagnosticsToProto(notes []runtime.RunNote, model *CachedModel) []*p
 			pbDiags = append(pbDiags, DiagnosticToProto(diag, sf))
 			continue
 		}
-		pbDiags = append(pbDiags, &pb.Diagnostic{Severity: diag.Severity.String(), Message: diag.Message})
+		pbDiags = append(pbDiags, &pb.Diagnostic{Severity: diag.Severity.String(), Message: diag.Message, Code: diag.Code})
 	}
 	return pbDiags
 }
 
-// ParserDiagnosticToProto converts a parser.Diagnostic to protobuf.
+// SyntaxDiagnosticCode is the code every reporter gives a parser error; the
+// parser itself codes only warnings.
+const SyntaxDiagnosticCode = "syntax"
+
+// ParserDiagnosticToProto converts a parser error to protobuf.
 func ParserDiagnosticToProto(diag parser.Diagnostic, sf *source.SourceFile) *pb.Diagnostic {
 	li := sf.Lines()
 	start := li.PosAt(diag.Span.Offset)
@@ -122,6 +127,7 @@ func ParserDiagnosticToProto(diag parser.Diagnostic, sf *source.SourceFile) *pb.
 	return &pb.Diagnostic{
 		Severity: "error", // Parser diagnostics are always errors
 		Message:  diag.Message,
+		Code:     SyntaxDiagnosticCode,
 		Span: &pb.Span{
 			File:      sf.Name(),
 			StartLine: int32Clamp(start.Line),
diff --git a/internal/grpc/diagnostic_code_test.go b/internal/grpc/diagnostic_code_test.go
new file mode 100644
index 000000000..086a4cb84
--- /dev/null
+++ b/internal/grpc/diagnostic_code_test.go
@@ -0,0 +1,443 @@
+package grpc
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	pb "github.com/Open-MBEE/OpenSysML/api/proto"
+	"github.com/Open-MBEE/OpenSysML/internal/core/runtime"
+	"google.golang.org/protobuf/proto"
+)
+
+// codesOf lists the codes of diags, in order.
+func codesOf(diags []*pb.Diagnostic) []string {
+	out := make([]string, 0, len(diags))
+	for _, d := range diags {
+		out = append(out, d.Code)
+	}
+	return out
+}
+
+// requireCode fails unless some diagnostic carries code, and every diagnostic
+// carrying it is what its message says it is.
+func requireCode(t *testing.T, diags []*pb.Diagnostic, code, messagePrefix string) {
+	t.Helper()
+	found := false
+	for _, d := range diags {
+		if d.Code != code {
+			continue
+		}
+		found = true
+		if !strings.HasPrefix(d.Message, messagePrefix) {
+			t.Errorf("code %q on %q, want a message starting %q", code, d.Message, messagePrefix)
+		}
+	}
+	if !found {
+		t.Errorf("no diagnostic coded %q among %v", code, codesOf(diags))
+	}
+}
+
+// requireEveryCoded fails when any diagnostic crosses without a code.
+func requireEveryCoded(t *testing.T, diags []*pb.Diagnostic) {
+	t.Helper()
+	for _, d := range diags {
+		if d.Code == "" {
+			t.Errorf("diagnostic crossed uncoded: %s %q", d.Severity, d.Message)
+		}
+	}
+}
+
+const codedModel = `
+package Coded {
+  part def Wheel {
+    part hub : Missing;
+  }
+}
+`
+
+// A parse reports a syntax error as "syntax" and a validation finding under the
+// code its pass gave it, and GetDiagnostics reports the same codes.
+func TestParseFile_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+
+	parseResp, err := srv.ParseFile(context.Background(), &pb.ParseFileRequest{
+		Source: &pb.ParseFileRequest_Content{Content: codedModel},
+	})
+	if err != nil {
+		t.Fatalf("ParseFile: %v", err)
+	}
+	requireCode(t, parseResp.Diagnostics, "unresolved", "unresolved reference")
+	requireEveryCoded(t, parseResp.Diagnostics)
+
+	diagResp, err := srv.GetDiagnostics(context.Background(), &pb.DiagnosticsRequest{ModelHash: parseResp.ModelHash})
+	if err != nil {
+		t.Fatalf("GetDiagnostics: %v", err)
+	}
+	if got, want := strings.Join(codesOf(diagResp.Diagnostics), ","), strings.Join(codesOf(parseResp.Diagnostics), ","); got != want {
+		t.Errorf("GetDiagnostics codes = %s, want the parse's %s", got, want)
+	}
+
+	broken, err := srv.ParseFile(context.Background(), &pb.ParseFileRequest{
+		Source: &pb.ParseFileRequest_Content{Content: "package P { part def "},
+	})
+	if err != nil {
+		t.Fatalf("ParseFile: %v", err)
+	}
+	if len(broken.Diagnostics) == 0 {
+		t.Fatal("a syntax error produced no diagnostic")
+	}
+	for _, d := range broken.Diagnostics {
+		if d.Code != SyntaxDiagnosticCode {
+			t.Errorf("syntax error coded %q, want %q: %s", d.Code, SyntaxDiagnosticCode, d.Message)
+		}
+	}
+}
+
+// A document set's diagnostics carry their codes as one document's do: a
+// validation code when the set parses, "syntax" when a document does not.
+func TestParseSources_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+	defer srv.Close()
+
+	resp, err := srv.ParseSources(context.Background(), &pb.ParseSourcesRequest{
+		Documents: inlineDocuments("coded.sysml", codedModel, "empty.sysml", "package Empty {}"),
+	})
+	if err != nil {
+		t.Fatalf("ParseSources: %v", err)
+	}
+	requireCode(t, resp.Diagnostics, "unresolved", "unresolved reference")
+	requireEveryCoded(t, resp.Diagnostics)
+
+	resp, err = srv.ParseSources(context.Background(), &pb.ParseSourcesRequest{
+		Documents: inlineDocuments("coded.sysml", codedModel, "broken.sysml", "package P { part def "),
+	})
+	if err != nil {
+		t.Fatalf("ParseSources: %v", err)
+	}
+	requireCode(t, resp.Diagnostics, SyntaxDiagnosticCode, "")
+	requireEveryCoded(t, resp.Diagnostics)
+}
+
+// An expression that does not parse is refused with "syntax" diagnostics.
+func TestEvaluate_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+	hash := mustParse(t, srv, "package P {}")
+
+	resp, err := srv.Evaluate(context.Background(), &pb.EvaluateRequest{ModelHash: hash, Expression: "1 +"})
+	if err != nil {
+		t.Fatalf("Evaluate: %v", err)
+	}
+	if resp.Error == "" || len(resp.Diagnostics) == 0 {
+		t.Fatalf("an unparsable expression evaluated: %v", resp)
+	}
+	for _, d := range resp.Diagnostics {
+		if d.Code != SyntaxDiagnosticCode {
+			t.Errorf("syntax error coded %q, want %q: %s", d.Code, SyntaxDiagnosticCode, d.Message)
+		}
+	}
+}
+
+// An action run reports its choice points as "choice-point" and the guards it
+// could not evaluate as "guard-unevaluable", whether or not the choice was
+// located in the model.
+func TestExecuteAction_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+
+	content := `
+package Test {
+  action tally {
+    attribute leftCount : Integer = 0;
+    attribute rightCount : Integer = 0;
+    first start;
+    fork split;
+    action left { assign leftCount := leftCount + 1; }
+    action right { assign rightCount := rightCount + 10; }
+    join sync;
+    done;
+    succession first start then split;
+    succession first split then left;
+    succession first split then right;
+    succession first left then sync;
+    succession first right then sync;
+    succession first sync then done;
+  }
+  action route {
+    attribute level : Integer = 75;
+    attribute handler : Integer = 0;
+    first start;
+    then decide select;
+      if level > 50 then warn;
+      if 1 / (level - 75) > 0 then alarm;
+    action warn { assign handler := 1; }
+    then done;
+    action alarm { assign handler := 2; }
+    then done;
+  }
+}
+`
+	hash := mustParse(t, srv, content)
+
+	resp, err := srv.ExecuteAction(context.Background(), &pb.ExecuteActionRequest{ModelHash: hash, ActionSymbolId: "Test::tally"})
+	if err != nil {
+		t.Fatalf("ExecuteAction: %v", err)
+	}
+	if resp.Error != "" {
+		t.Fatalf("execution error: %s", resp.Error)
+	}
+	requireCode(t, resp.Diagnostics, runtime.ChoiceDiagnosticCode, "choice point: ")
+	requireEveryCoded(t, resp.Diagnostics)
+
+	resp, err = srv.ExecuteAction(context.Background(), &pb.ExecuteActionRequest{ModelHash: hash, ActionSymbolId: "Test::route"})
+	if err != nil {
+		t.Fatalf("ExecuteAction: %v", err)
+	}
+	if resp.Error != "" {
+		t.Fatalf("execution error: %s", resp.Error)
+	}
+	requireCode(t, resp.Diagnostics, runtime.UnevaluableGuardCode, "guard not evaluable: ")
+	requireEveryCoded(t, resp.Diagnostics)
+}
+
+// A state run's choice among transitions is coded "choice-point".
+func TestExecuteState_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+	hash := mustParse(t, srv, `
+package Test {
+  state Dispatcher {
+    attribute level : Integer = 8;
+    entry; then idle;
+    state idle;
+    state low;
+    state high;
+    transition first idle accept Go if level > 5 then low;
+    transition first idle accept Go if level > 7 then high;
+  }
+}
+`)
+
+	resp, err := srv.ExecuteState(context.Background(), &pb.ExecuteStateRequest{
+		ModelHash: hash, StateMachineSymbolId: "Test::Dispatcher", Events: []string{"Go"},
+	})
+	if err != nil {
+		t.Fatalf("ExecuteState: %v", err)
+	}
+	if resp.Error != "" {
+		t.Fatalf("execution error: %s", resp.Error)
+	}
+	requireCode(t, resp.Diagnostics, runtime.ChoiceDiagnosticCode, "choice point: ")
+	requireEveryCoded(t, resp.Diagnostics)
+}
+
+// An analysis run's choice points, among tokens and among writes, are coded
+// "choice-point".
+func TestRunAnalysis_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+	hash := mustVerifyModel(t, srv, `
+package An {
+	private import ScalarValues::*;
+
+	action def Tally {
+		out r : Integer = 0;
+		first start;
+		fork split;
+		action left { assign r := r + 1; }
+		action right { assign r := r + 10; }
+		join sync;
+		done;
+		succession first start then split;
+		succession first split then left;
+		succession first split then right;
+		succession first left then sync;
+		succession first right then sync;
+		succession first sync then done;
+	}
+
+	analysis forked {
+		out r : Integer;
+		perform action tally : Tally;
+		return : Integer = r;
+	}
+}
+`, "analysis-choice-codes")
+
+	resp := runAnalysis(t, srv, &pb.RunAnalysisRequest{ModelHash: hash, SymbolId: "An::forked"})
+	if resp.Error != "" {
+		t.Fatalf("RunAnalysis reported %q", resp.Error)
+	}
+	if len(resp.Diagnostics) != 2 {
+		t.Fatalf("diagnostics = %v, want the two choice points", resp.Diagnostics)
+	}
+	requireCode(t, resp.Diagnostics, runtime.ChoiceDiagnosticCode, "choice point: ")
+	requireEveryCoded(t, resp.Diagnostics)
+}
+
+// A conversion refused for a syntax error codes each diagnostic "syntax",
+// with a span and without one alike.
+func TestConvert_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+
+	for name, req := range map[string]*pb.ConvertRequest{
+		"notation": {
+			Source:     &pb.ConvertRequest_Content{Content: "package P { part def "},
+			FromFormat: "sysml",
+			ToFormat:   "ttl",
+		},
+		"turtle": {
+			Source:     &pb.ConvertRequest_Content{Content: "@prefix : <http://example.org/> .\n:a :b"},
+			FromFormat: "ttl",
+			ToFormat:   "sysml",
+		},
+	} {
+		resp, err := srv.Convert(context.Background(), req)
+		if err != nil {
+			t.Fatalf("%s: Convert: %v", name, err)
+		}
+		if resp.Error == "" || len(resp.Diagnostics) == 0 {
+			t.Fatalf("%s: unreadable input converted without diagnostics: %v", name, resp)
+		}
+		for _, d := range resp.Diagnostics {
+			if d.Code != SyntaxDiagnosticCode {
+				t.Errorf("%s: syntax error coded %q, want %q: %s", name, d.Code, SyntaxDiagnosticCode, d.Message)
+			}
+		}
+	}
+}
+
+// An edit refused for what it would make of the model reports the diagnostics
+// that refused it with their codes.
+func TestApplyEdits_DiagnosticCodes(t *testing.T) {
+	srv := mustNewService(t, 10)
+	hash := mustParsedModel(t, srv, editModelSource)
+
+	for _, tc := range []struct {
+		name  string
+		value string
+		code  string
+	}{
+		{"value does not parse", "1050.0[", SyntaxDiagnosticCode},
+		{"value does not resolve", "nosuchFeature", "unresolved"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			resp, err := srv.ApplyEdits(context.Background(), &pb.ApplyEditsRequest{
+				ModelHash:  hash,
+				Operations: []*pb.EditOperation{setValueOp("Demo::SC::unitMass", tc.value)},
+			})
+			if err != nil {
+				t.Fatalf("ApplyEdits: %v", err)
+			}
+			if resp.Error == "" || len(resp.Diagnostics) == 0 {
+				t.Fatalf("refusal carries no diagnostics: %v", resp)
+			}
+			requireCode(t, resp.Diagnostics, tc.code, "")
+			requireEveryCoded(t, resp.Diagnostics)
+		})
+	}
+}
+
+// Without "diagnostic_codes" every response family still reports its
+// diagnostics, identical but for the code, which is withheld; with it every
+// code is populated, so an empty one is a finding none was assigned.
+func TestDiagnosticCodes_Capability(t *testing.T) {
+	ctx := context.Background()
+	current := mustNewService(t, 10)
+	withheld := mustNewServiceWithout(t, CapabilityDiagnosticCodes)
+
+	stateMachine := `
+package Test {
+  state Dispatcher {
+    attribute level : Integer = 8;
+    entry; then idle;
+    state idle;
+    state low;
+    state high;
+    transition first idle accept Go if level > 5 then low;
+    transition first idle accept Go if level > 7 then high;
+  }
+}
+`
+	families := map[string]func(srv *Service) []*pb.Diagnostic{
+		"ParseFile": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.ParseFile(ctx, &pb.ParseFileRequest{Source: &pb.ParseFileRequest_Content{Content: codedModel}})
+			if err != nil {
+				t.Fatalf("ParseFile: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"GetDiagnostics": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.GetDiagnostics(ctx, &pb.DiagnosticsRequest{ModelHash: mustParse(t, srv, codedModel)})
+			if err != nil {
+				t.Fatalf("GetDiagnostics: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"ParseSources": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.ParseSources(ctx, &pb.ParseSourcesRequest{
+				Documents: inlineDocuments("coded.sysml", codedModel, "broken.sysml", "package P { part def "),
+			})
+			if err != nil {
+				t.Fatalf("ParseSources: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"Evaluate": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.Evaluate(ctx, &pb.EvaluateRequest{ModelHash: mustParse(t, srv, "package P {}"), Expression: "1 +"})
+			if err != nil {
+				t.Fatalf("Evaluate: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"ExecuteState": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.ExecuteState(ctx, &pb.ExecuteStateRequest{
+				ModelHash: mustParse(t, srv, stateMachine), StateMachineSymbolId: "Test::Dispatcher", Events: []string{"Go"},
+			})
+			if err != nil {
+				t.Fatalf("ExecuteState: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"Convert": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.Convert(ctx, &pb.ConvertRequest{
+				Source: &pb.ConvertRequest_Content{Content: "package P { part def "}, FromFormat: "sysml", ToFormat: "ttl",
+			})
+			if err != nil {
+				t.Fatalf("Convert: %v", err)
+			}
+			return resp.Diagnostics
+		},
+		"ApplyEdits": func(srv *Service) []*pb.Diagnostic {
+			resp, err := srv.ApplyEdits(ctx, &pb.ApplyEditsRequest{
+				ModelHash:  mustParsedModel(t, srv, editModelSource),
+				Operations: []*pb.EditOperation{setValueOp("Demo::SC::unitMass", "nosuchFeature")},
+			})
+			if err != nil {
+				t.Fatalf("ApplyEdits: %v", err)
+			}
+			return resp.Diagnostics
+		},
+	}
+
+	for name, call := range families {
+		t.Run(name, func(t *testing.T) {
+			coded := call(current)
+			uncoded := call(withheld)
+			if len(coded) == 0 {
+				t.Fatal("no diagnostics to compare")
+			}
+			requireEveryCoded(t, coded)
+			if len(uncoded) != len(coded) {
+				t.Fatalf("withheld service reported %d diagnostics, want %d", len(uncoded), len(coded))
+			}
+			for i, d := range uncoded {
+				if d.Code != "" {
+					t.Errorf("withheld service reported code %q", d.Code)
+				}
+				want := proto.Clone(coded[i]).(*pb.Diagnostic)
+				want.Code = ""
+				if !proto.Equal(d, want) {
+					t.Errorf("withheld diagnostic = %v, want %v", d, want)
+				}
+			}
+		})
+	}
+}
diff --git a/internal/grpc/edit.go b/internal/grpc/edit.go
index 2756a0792..df8b1145b 100644
--- a/internal/grpc/edit.go
+++ b/internal/grpc/edit.go
@@ -61,7 +61,7 @@ func (s *Service) ApplyEdits(ctx context.Context, req *pb.ApplyEditsRequest) (*p
 	}
 	result, err := edit.Apply(model, ops)
 	if err != nil {
-		return editRefusal(err, doc.Source)
+		return s.editRefusal(err, doc.Source)
 	}
 	return &pb.ApplyEditsResponse{
 		Content: string(result.Content),
@@ -111,7 +111,7 @@ func editOperations(pbOps []*pb.EditOperation) ([]edit.Operation, error) {
 
 // editRefusal reports a refused edit as a response rather than a call failure:
 // the request was well formed, and the answer is why the model was not edited.
-func editRefusal(err error, sf *source.SourceFile) (*pb.ApplyEditsResponse, error) {
+func (s *Service) editRefusal(err error, sf *source.SourceFile) (*pb.ApplyEditsResponse, error) {
 	var refusal *edit.Error
 	if !errors.As(err, &refusal) {
 		return nil, statusErrorf(connect.CodeInternal, "apply edits: %v", err)
@@ -130,6 +130,7 @@ func editRefusal(err error, sf *source.SourceFile) (*pb.ApplyEditsResponse, erro
 	for _, diag := range refusal.Diagnostics {
 		resp.Diagnostics = append(resp.Diagnostics, DiagnosticToProto(diag, diagnosed))
 	}
+	s.filterDiagnosticCapabilities(resp.Diagnostics)
 	return resp, nil
 }
 
diff --git a/internal/grpc/export.go b/internal/grpc/export.go
index 0e3c69740..9770afcca 100644
--- a/internal/grpc/export.go
+++ b/internal/grpc/export.go
@@ -48,12 +48,12 @@ func (s *Service) Convert(ctx context.Context, req *pb.ConvertRequest) (*pb.Conv
 		resp.Error = err.Error()
 		var broken *export.SyntaxError
 		if errors.As(err, &broken) {
-			resp.Diagnostics = syntaxDiagnostics(broken)
+			resp.Diagnostics = s.filterDiagnosticCapabilities(syntaxDiagnostics(broken))
 		}
 		return resp, nil
 	}
 	resp.Content = string(out)
-	resp.Diagnostics = syntaxDiagnostics(syntax)
+	resp.Diagnostics = s.filterDiagnosticCapabilities(syntaxDiagnostics(syntax))
 	return resp, nil
 }
 
@@ -144,6 +144,7 @@ func syntaxDiagnostics(syntax *export.SyntaxError) []*pb.Diagnostic {
 		diags = append(diags, &pb.Diagnostic{
 			Severity: "error",
 			Message:  message,
+			Code:     SyntaxDiagnosticCode,
 			Span:     &pb.Span{File: syntax.Name},
 		})
 	}
diff --git a/internal/grpc/service.go b/internal/grpc/service.go
index d08827ce9..6be8062be 100644
--- a/internal/grpc/service.go
+++ b/internal/grpc/service.go
@@ -118,6 +118,10 @@ const CapabilityVerificationVerdicts = "verification_verdicts"
 // `*` as Value.infinity, rather than reporting it as an unsupported null.
 const CapabilityInfinityValue = "infinity_value"
 
+// CapabilityDiagnosticCodes names the capability of populating Diagnostic.code,
+// so an empty code is a finding none was assigned rather than an older service.
+const CapabilityDiagnosticCodes = "diagnostic_codes"
+
 // capabilities is what this build supports, in report order. A capability is
 // only ever added: renaming or dropping one breaks clients that require it.
 var capabilities = []string{
@@ -128,7 +132,7 @@ var capabilities = []string{
 	CapabilityStrictConformance, CapabilityDocumentQuery, CapabilityRenderDocument,
 	CapabilityParseSources, CapabilityComplexValues, CapabilityStructuredValues,
 	CapabilityMeasurementRefs, CapabilityFunctionValues, CapabilityVerificationVerdicts,
-	CapabilityInfinityValue,
+	CapabilityInfinityValue, CapabilityDiagnosticCodes,
 }
 
 type capabilityAvailability struct {
@@ -554,7 +558,7 @@ func (s *Service) modelDiagnostics(model *CachedModel) []*pb.Diagnostic {
 			pbDiags = append(pbDiags, DiagnosticToProto(diag, doc.Source))
 		}
 	}
-	return pbDiags
+	return s.filterDiagnosticCapabilities(pbDiags)
 }
 
 // Evaluate evaluates a SysML expression in the context of a parsed model
@@ -583,7 +587,7 @@ func (s *Service) Evaluate(ctx context.Context, req *pb.EvaluateRequest) (*pb.Ev
 			pbDiags = append(pbDiags, ParserDiagnosticToProto(diag, exprSource))
 		}
 		return &pb.EvaluateResponse{
-			Diagnostics: pbDiags,
+			Diagnostics: s.filterDiagnosticCapabilities(pbDiags),
 			Error:       "expression parse failed",
 		}, nil
 	}
@@ -756,7 +760,7 @@ func (s *Service) ExecuteAction(ctx context.Context, req *pb.ExecuteActionReques
 	outputs, err := runtimeCtx.ExecuteActionWithInputs(action, inputs)
 	// The choices the run made are reported with its outcome, failed or not: a
 	// failure may hang on the order taken.
-	diags := RunNoteDiagnosticsToProto(runtimeCtx.Notes(), cached)
+	diags := s.filterDiagnosticCapabilities(RunNoteDiagnosticsToProto(runtimeCtx.Notes(), cached))
 	if err != nil {
 		return &pb.ExecuteActionResponse{
 			Error:       fmt.Sprintf("action execution failed: %v", err),
@@ -800,7 +804,7 @@ func (s *Service) ExecuteState(ctx context.Context, req *pb.ExecuteStateRequest)
 	// Execute state machine, injecting the requested events and capturing the
 	// real ordered state-visit trace.
 	finalContext, statesVisited, err := runtimeCtx.ExecuteStateWithEvents(stateMachine, req.Events)
-	diags := RunNoteDiagnosticsToProto(runtimeCtx.Notes(), cached)
+	diags := s.filterDiagnosticCapabilities(RunNoteDiagnosticsToProto(runtimeCtx.Notes(), cached))
 	if err != nil {
 		return &pb.ExecuteStateResponse{
 			Error:       fmt.Sprintf("state machine execution failed: %v", err),