diff --git a/.config/mise/config.toml b/.config/mise/config.toml
index 0232027d5..b2eb0e2c7 100644
--- a/.config/mise/config.toml
+++ b/.config/mise/config.toml
@@ -178,6 +178,10 @@ run = [
     "jsonschema metaschema spec/workbench/draft.5/schemas",
     "jsonschema test spec/workbench/draft.5/tests -r spec/workbench/schemas -r spec/workbench/draft.5/schemas",
     "jsonschema validate spec/workbench/draft.5/schemas/mck-corpus.schema.json spec/workbench/mck/draft.5/cases.json -r spec/workbench/schemas -r spec/workbench/draft.5/schemas",
+    "jsonschema fmt spec/workbench/jobs/draft.1/schemas --check",
+    "jsonschema lint spec/workbench/jobs/draft.1/schemas -r spec/workbench/jobs/draft.1/schemas -r spec/workbench/draft.5/schemas -r spec/workbench/schemas",
+    "jsonschema metaschema spec/workbench/jobs/draft.1/schemas",
+    "jsonschema test spec/workbench/jobs/draft.1/tests -r spec/workbench/jobs/draft.1/schemas -r spec/workbench/draft.5/schemas -r spec/workbench/schemas",
 ]
 
 # Not part of `check`: website:build-schemas depends on website:install, whose
diff --git a/spec/workbench/README.md b/spec/workbench/README.md
index 52d83f41d..c783e7c38 100644
--- a/spec/workbench/README.md
+++ b/spec/workbench/README.md
@@ -171,3 +171,10 @@ terminal evidence to an admitted invocation suite and public manifest. Its
 [377-case kit](mck/draft.5/README.md) preserves returned values, SDK model errors,
 primary failures, cancellation and separate cleanup failures. Offline admission
 does not establish actual host execution or authoritative job cancellation.
+
+[Snapshot-bound job receipts](jobs/draft.1/README.md) define a separate exact
+`morphir/workbench/jobs` `0.1.0-draft.1` profile. The portable reducer binds
+authority, snapshot and call inventory; separates cancellation acknowledgement
+from terminal evidence; and retains host receipts across same-session reconnect.
+This contribution does not change any offline MCK draft or add live RPC methods.
+Shared transition MCK qualification and authenticated host adapters remain pending.
diff --git a/spec/workbench/jobs/draft.1/README.md b/spec/workbench/jobs/draft.1/README.md
new file mode 100644
index 000000000..5ed5a69d0
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/README.md
@@ -0,0 +1,128 @@
+# Snapshot-bound Workbench job receipts
+
+This transport-neutral profile is exactly `0.1.0-draft.1`, named
+`morphir/workbench/jobs`. It is a new contract namespace, separate from value and
+terminal admission drafts. Its terminal payload references the frozen
+`0.1.0-draft.5` outcome envelope without changing it.
+
+This contribution defines receipt admission and client reduction. It does not
+add JSON-RPC methods, authenticate hosts, execute jobs or advertise support in
+the existing connected host. Connected `protocolVersion: 1`, generated-driver
+v1 and the five offline Workbench MCK drafts remain unchanged. A host adapter
+must implement and qualify the profile before a client enables live controls.
+
+## Authority and negotiation
+
+An authenticated host offers exactly:
+
+```json
+{"profile":"morphir/workbench/jobs","contractVersion":"0.1.0-draft.1","hostId":"host","sessionId":"session","providerId":"provider","operations":["query","cancel"]}
+```
+
+`query` is required; `cancel` is optional. Operations are a unique set. Unknown
+operations, members, profile names, versions and version build suffixes reject.
+Only this exact prerelease is supported. No generic SemVer comparison is needed
+for this fixed draft; a reader with version ranges must use a SemVer library.
+An offline schema fixture is not a live capability advertisement.
+
+The caller obtains the expected binding from authenticated submission, never
+from the receipt it is about to validate. The identity contains exactly
+`hostId`, `sessionId`, `providerId`, `jobId` and `snapshotId`. Each contains
+1 to 128 UTF-16 code units. The offer's first three fields must match. Provider
+and snapshot are immutable for the job, including while reconnecting. A new
+session or provider cannot borrow the old job's authority. A snapshot handle
+denotes immutable execution input; it is not a local path or a content hash
+unless a separately qualified host contract says so.
+
+Host authentication, provider trust, public-entry admission and snapshot
+creation remain host responsibilities. The reducer checks binding and receipt
+consistency, not cryptographic provenance. New project-scoped metadata bindings
+must remain scoped when a host translates a planned engine job into this identity.
+
+## Receipts
+
+A receipt has exactly these six fields:
+
+```json
+{"contractVersion":"0.1.0-draft.1","identity":{"hostId":"host","sessionId":"session","providerId":"provider","jobId":"job","snapshotId":"snapshot"},"sequence":0,"state":"submitted","cancelRequested":false,"outcomes":null}
+```
+
+| State | Outcomes | Meaning |
+| --- | --- | --- |
+| `submitted` | `null` | Host accepted this exact job and snapshot. |
+| `running` | `null` | Host reports execution in progress. |
+| `terminal` | Exact draft.5 envelope | Primary outcomes and separate cleanup are final. |
+
+Sequence numbers range from 0 through 2147483647 on every target. The initial
+submission receipt is sequence 0, submitted, with `cancelRequested: false`.
+Running and terminal receipts have positive sequences. Host revisions advance
+for a state change or cancellation acknowledgement, not merely because a query
+was issued. Polling may skip revisions; it does not require a complete event log.
+
+The client captures a nonempty ordered inventory of at most 1,000 invocation
+call IDs at submission. IDs contain 1 to 128 UTF-16 units and are unique. A
+terminal must have exactly that inventory, in order. Typed values retain the
+draft.5 bounds and shape; the host must also admit every output against the
+submitted manifest. This receipt reducer alone cannot establish output types.
+`Result.Err` remains returned data. SDK errors, primary failures, cancellation
+and cleanup keep their distinct variants. Cleanup never changes primary status.
+
+## Reduction and cancellation races
+
+Validate the entire supplied receipt and its identity before sequence handling.
+Malformed or wrongly bound stale evidence rejects. With the exact binding:
+
+- A lower sequence is stale and leaves the cursor unchanged.
+- An equal sequence and identical admitted payload is an idempotent replay.
+- An equal sequence with conflicting payload rejects.
+- A higher sequence can move submitted to running or directly to terminal.
+  Running cannot move back to submitted. Terminal is immutable.
+- Cancellation acknowledgement can change false to true while submitted or
+  running. Once acknowledged it cannot return to false. It requires a negotiated
+  cancellation operation. The same state and acknowledgement cannot acquire a
+  new revision without a change.
+
+`cancelRequested` means the host acknowledged a request. It does not mean any
+call terminated. Sending a client cancellation request changes no authoritative
+receipt. A host may finish with returned values or failures after acknowledgement.
+The host may also cancel by its own policy without a client request. The primary
+terminal payload decides each call's outcome.
+
+If cancellation is unavailable, the client must not send it. If the job is
+terminal, use the retained terminal rather than sending another request. If
+disconnected, the client retains the last receipt and reports unavailable
+transport. Disconnect and timeout are never synthesized as failed or cancelled
+job receipts. A timeout can leave the host running.
+
+## Disconnect and reconnect
+
+Connection availability is client state, separate from submitted/running/terminal.
+An offline cursor cannot adopt incoming receipts. Reconnect requires a newly
+authenticated offer with the exact previous host, session, provider, draft and
+operation set. It restores transport availability and permits a fresh query of
+the existing identity. The ordinary stale/replay/advance rules admit that reply.
+
+This qualifies in-memory same-session reconciliation only. It does not promise
+durable job retention, recovery after host restart, transferable sessions,
+exactly-once submission or an authenticated transport implementation. A changed
+session requires explicit host recovery support, not a fresh label on old evidence.
+
+## Bounds and qualification
+
+Raw receipt framing must be capped at 1 MiB before JSON parsing. JSON parsers at
+the host boundary must reject duplicate members. Closed parsed shapes then feed
+the portable reducer. No Ion receipt mapping is defined in this first job draft;
+existing JSON and Ion evaluation inputs and outcome codecs remain supported.
+
+The schemas check shape, discriminants, closed members, versions and numeric
+bounds. Schema string lengths count code points; the reducer enforces UTF-16
+identity limits. Sequence transitions, authority equality, call inventory,
+acknowledgement monotonicity and authentication are semantic requirements, not
+established by schema validation.
+
+Structural fixtures run through the existing `workbench:schema-check` task.
+The MoonBit implementation has portable semantic tests on JS, native, Wasm and
+Wasm GC. These are implementation tests, not a shared MCK adapter qualification
+or evidence that the Rust connected host implements job execution. A future
+shared MCK slice must add parent-owned transition goldens to the existing runner,
+then qualify host adapters and bind query/cancel transport methods.
diff --git a/spec/workbench/jobs/draft.1/schemas/identity.schema.json b/spec/workbench/jobs/draft.1/schemas/identity.schema.json
new file mode 100644
index 000000000..3aa902ebe
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/schemas/identity.schema.json
@@ -0,0 +1,45 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/identity.schema.json",
+  "title": "Snapshot-bound job identity",
+  "description": "Immutable host, session, provider, job and model snapshot binding. Identity strings also require bounded UTF-16 units in the reducer",
+  "examples": [
+    {
+      "hostId": "host",
+      "sessionId": "session",
+      "providerId": "provider",
+      "jobId": "job",
+      "snapshotId": "snapshot"
+    }
+  ],
+  "type": "object",
+  "required": [ "hostId", "sessionId", "providerId", "jobId", "snapshotId" ],
+  "properties": {
+    "hostId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "sessionId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "providerId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "jobId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "snapshotId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/spec/workbench/jobs/draft.1/schemas/offer.schema.json b/spec/workbench/jobs/draft.1/schemas/offer.schema.json
new file mode 100644
index 000000000..88884267b
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/schemas/offer.schema.json
@@ -0,0 +1,61 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/offer.schema.json",
+  "title": "Exact Workbench jobs offer",
+  "description": "Exact prerelease receipt profile offered by an authenticated host. Query is required and cancellation is optional. This schema does not grant authority",
+  "examples": [
+    {
+      "profile": "morphir/workbench/jobs",
+      "contractVersion": "0.1.0-draft.1",
+      "hostId": "host",
+      "sessionId": "session",
+      "providerId": "provider",
+      "operations": [ "query", "cancel" ]
+    }
+  ],
+  "type": "object",
+  "required": [
+    "profile",
+    "contractVersion",
+    "hostId",
+    "sessionId",
+    "providerId",
+    "operations"
+  ],
+  "properties": {
+    "profile": {
+      "const": "morphir/workbench/jobs"
+    },
+    "contractVersion": {
+      "const": "0.1.0-draft.1"
+    },
+    "hostId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "sessionId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "providerId": {
+      "type": "string",
+      "maxLength": 128,
+      "minLength": 1
+    },
+    "operations": {
+      "type": "array",
+      "maxItems": 2,
+      "minItems": 1,
+      "uniqueItems": true,
+      "contains": {
+        "const": "query"
+      },
+      "items": {
+        "enum": [ "query", "cancel" ]
+      }
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/spec/workbench/jobs/draft.1/schemas/receipt.schema.json b/spec/workbench/jobs/draft.1/schemas/receipt.schema.json
new file mode 100644
index 000000000..d3b60bc94
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/schemas/receipt.schema.json
@@ -0,0 +1,122 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/receipt.schema.json",
+  "title": "Authoritative job receipt",
+  "description": "Closed host receipt with separate cancellation acknowledgement and exact draft.5 terminal evidence. Cross-receipt semantics require the portable reducer",
+  "examples": [
+    {
+      "contractVersion": "0.1.0-draft.1",
+      "identity": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "jobId": "job",
+        "snapshotId": "snapshot"
+      },
+      "sequence": 0,
+      "state": "submitted",
+      "cancelRequested": false,
+      "outcomes": null
+    }
+  ],
+  "type": "object",
+  "allOf": [
+    {
+      "if": {
+        "properties": {
+          "state": {
+            "const": "running"
+          }
+        }
+      },
+      "then": {
+        "properties": {
+          "sequence": {
+            "minimum": 1
+          }
+        }
+      }
+    },
+    {
+      "if": {
+        "properties": {
+          "sequence": {
+            "const": 0
+          }
+        }
+      },
+      "then": {
+        "properties": {
+          "state": {
+            "const": "submitted"
+          },
+          "cancelRequested": {
+            "const": false
+          }
+        }
+      }
+    }
+  ],
+  "if": {
+    "properties": {
+      "state": {
+        "const": "terminal"
+      }
+    }
+  },
+  "then": {
+    "properties": {
+      "sequence": {
+        "minimum": 1
+      },
+      "outcomes": {
+        "$ref": "https://morphir.finos.org/spec/workbench/0.1.0-draft.5/terminal-outcomes.schema.json"
+      }
+    }
+  },
+  "else": {
+    "properties": {
+      "outcomes": {
+        "type": "null"
+      }
+    }
+  },
+  "required": [
+    "contractVersion",
+    "identity",
+    "sequence",
+    "state",
+    "cancelRequested",
+    "outcomes"
+  ],
+  "properties": {
+    "contractVersion": {
+      "const": "0.1.0-draft.1"
+    },
+    "identity": {
+      "$ref": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/identity.schema.json"
+    },
+    "sequence": {
+      "type": "integer",
+      "maximum": 2147483647,
+      "minimum": 0
+    },
+    "state": {
+      "enum": [ "submitted", "running", "terminal" ]
+    },
+    "cancelRequested": {
+      "type": "boolean"
+    },
+    "outcomes": {
+      "oneOf": [
+        {
+          "type": "null"
+        },
+        {
+          "$ref": "https://morphir.finos.org/spec/workbench/0.1.0-draft.5/terminal-outcomes.schema.json"
+        }
+      ]
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/spec/workbench/jobs/draft.1/tests/identity.json b/spec/workbench/jobs/draft.1/tests/identity.json
new file mode 100644
index 000000000..74708411c
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/tests/identity.json
@@ -0,0 +1,60 @@
+{
+  "target": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/identity.schema.json",
+  "tests": [
+    {
+      "description": "Exact identity",
+      "data": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "jobId": "job",
+        "snapshotId": "snapshot"
+      },
+      "valid": true
+    },
+    {
+      "description": "Empty snapshot",
+      "data": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "jobId": "job",
+        "snapshotId": ""
+      },
+      "valid": false
+    },
+    {
+      "description": "No job",
+      "data": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "snapshotId": "snapshot"
+      },
+      "valid": false
+    },
+    {
+      "description": "Unknown member",
+      "data": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "jobId": "job",
+        "snapshotId": "snapshot",
+        "path": "/local/path"
+      },
+      "valid": false
+    },
+    {
+      "description": "Long provider",
+      "data": {
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp",
+        "jobId": "job",
+        "snapshotId": "snapshot"
+      },
+      "valid": false
+    }
+  ]
+}
diff --git a/spec/workbench/jobs/draft.1/tests/offer.json b/spec/workbench/jobs/draft.1/tests/offer.json
new file mode 100644
index 000000000..8a6a5a03a
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/tests/offer.json
@@ -0,0 +1,154 @@
+{
+  "target": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/offer.schema.json",
+  "tests": [
+    {
+      "description": "Query and cancel",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "cancel"
+        ]
+      },
+      "valid": true
+    },
+    {
+      "description": "Query without cancellation",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query"
+        ]
+      },
+      "valid": true
+    },
+    {
+      "description": "Reordered operations",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "cancel",
+          "query"
+        ]
+      },
+      "valid": true
+    },
+    {
+      "description": "Cancel alone",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "cancel"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Duplicate operation",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "query"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Unknown operation",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "evaluate"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Other draft",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.2",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "cancel"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Release spelling",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "cancel"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Build spelling",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1+build",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "cancel"
+        ]
+      },
+      "valid": false
+    },
+    {
+      "description": "Unknown flag",
+      "data": {
+        "profile": "morphir/workbench/jobs",
+        "contractVersion": "0.1.0-draft.1",
+        "hostId": "host",
+        "sessionId": "session",
+        "providerId": "provider",
+        "operations": [
+          "query",
+          "cancel"
+        ],
+        "recovery": true
+      },
+      "valid": false
+    }
+  ]
+}
diff --git a/spec/workbench/jobs/draft.1/tests/receipt.json b/spec/workbench/jobs/draft.1/tests/receipt.json
new file mode 100644
index 000000000..3c51676fc
--- /dev/null
+++ b/spec/workbench/jobs/draft.1/tests/receipt.json
@@ -0,0 +1,409 @@
+{
+  "target": "https://morphir.finos.org/spec/workbench/jobs/0.1.0-draft.1/receipt.schema.json",
+  "tests": [
+    {
+      "description": "Submitted",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0,
+        "state": "submitted",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": true
+    },
+    {
+      "description": "Running",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 1,
+        "state": "running",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": true
+    },
+    {
+      "description": "Acknowledged while queued",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 1,
+        "state": "submitted",
+        "cancelRequested": true,
+        "outcomes": null
+      },
+      "valid": true
+    },
+    {
+      "description": "Return can win cancellation race",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2,
+        "state": "terminal",
+        "cancelRequested": true,
+        "outcomes": {
+          "contractVersion": "0.1.0-draft.5",
+          "calls": [
+            {
+              "id": "call",
+              "outcome": {
+                "status": "returned",
+                "value": {
+                  "type": "bool",
+                  "value": true
+                }
+              }
+            }
+          ],
+          "cleanup": {
+            "stage": "cleanup",
+            "code": "provider.dispose",
+            "message": "dispose failed"
+          },
+          "extensions": null
+        }
+      },
+      "valid": true
+    },
+    {
+      "description": "Host cancellation without client request",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2,
+        "state": "terminal",
+        "cancelRequested": false,
+        "outcomes": {
+          "contractVersion": "0.1.0-draft.5",
+          "calls": [
+            {
+              "id": "call",
+              "outcome": {
+                "status": "cancelled"
+              }
+            }
+          ],
+          "cleanup": null,
+          "extensions": null
+        }
+      },
+      "valid": true
+    },
+    {
+      "description": "Premature running",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0,
+        "state": "running",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Acknowledged initial submission",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0,
+        "state": "submitted",
+        "cancelRequested": true,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Terminal requires payload",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 1,
+        "state": "terminal",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Nonterminal cannot carry values",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2,
+        "state": "running",
+        "cancelRequested": true,
+        "outcomes": {
+          "contractVersion": "0.1.0-draft.5",
+          "calls": [
+            {
+              "id": "call",
+              "outcome": {
+                "status": "returned",
+                "value": {
+                  "type": "bool",
+                  "value": true
+                }
+              }
+            }
+          ],
+          "cleanup": {
+            "stage": "cleanup",
+            "code": "provider.dispose",
+            "message": "dispose failed"
+          },
+          "extensions": null
+        }
+      },
+      "valid": false
+    },
+    {
+      "description": "Unknown state",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0,
+        "state": "disconnected",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Negative sequence",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": -1,
+        "state": "submitted",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Fractional sequence",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0.5,
+        "state": "submitted",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Out of range sequence",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2147483648,
+        "state": "submitted",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": false
+    },
+    {
+      "description": "Maximum sequence",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2147483647,
+        "state": "running",
+        "cancelRequested": false,
+        "outcomes": null
+      },
+      "valid": true
+    },
+    {
+      "description": "Wrong nested terminal draft",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2,
+        "state": "terminal",
+        "cancelRequested": true,
+        "outcomes": {
+          "contractVersion": "0.1.0-draft.6",
+          "calls": [
+            {
+              "id": "call",
+              "outcome": {
+                "status": "returned",
+                "value": {
+                  "type": "bool",
+                  "value": true
+                }
+              }
+            }
+          ],
+          "cleanup": {
+            "stage": "cleanup",
+            "code": "provider.dispose",
+            "message": "dispose failed"
+          },
+          "extensions": null
+        }
+      },
+      "valid": false
+    },
+    {
+      "description": "Unknown receipt field",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 0,
+        "state": "submitted",
+        "cancelRequested": false,
+        "outcomes": null,
+        "success": true
+      },
+      "valid": false
+    },
+    {
+      "description": "Contradictory returned value",
+      "data": {
+        "contractVersion": "0.1.0-draft.1",
+        "identity": {
+          "hostId": "host",
+          "sessionId": "session",
+          "providerId": "provider",
+          "jobId": "job",
+          "snapshotId": "snapshot"
+        },
+        "sequence": 2,
+        "state": "terminal",
+        "cancelRequested": true,
+        "outcomes": {
+          "contractVersion": "0.1.0-draft.5",
+          "calls": [
+            {
+              "id": "call",
+              "outcome": {
+                "status": "returned",
+                "value": {
+                  "type": "bool",
+                  "value": true
+                },
+                "failure": {
+                  "stage": "evaluate",
+                  "code": "x",
+                  "message": "x"
+                }
+              }
+            }
+          ],
+          "cleanup": {
+            "stage": "cleanup",
+            "code": "provider.dispose",
+            "message": "dispose failed"
+          },
+          "extensions": null
+        }
+      },
+      "valid": false
+    }
+  ]
+}