diff --git a/evals/scenarios/assets/06-sep41-interface-types.json b/evals/scenarios/assets/06-sep41-interface-types.json
new file mode 100644
index 0000000..319cf2b
--- /dev/null
+++ b/evals/scenarios/assets/06-sep41-interface-types.json
@@ -0,0 +1,13 @@
+{
+  "skills": [
+    "assets"
+  ],
+  "query": "I'm writing a Soroban contract that implements the SEP-41 token interface. What are the exact signatures for transfer, transfer_from and symbol?",
+  "expected_behavior": [
+    "Gives `transfer(from: Address, to: MuxedAddress, amount: i128)`, with a `MuxedAddress` destination",
+    "Gives `transfer_from(spender: Address, from: Address, to: Address, amount: i128)`, keeping a plain `Address` destination",
+    "Gives `symbol() -> String`, not `Symbol`",
+    "Does not claim existing callers must convert an `Address` by hand: the generated client accepts `impl Into<MuxedAddress>`, so `&to` works",
+    "Does not suggest `&to.into()` for the client call, since it fails type inference (E0283)"
+  ]
+}
diff --git a/skills/assets/SKILL.md b/skills/assets/SKILL.md
index 1658beb..e649323 100644
--- a/skills/assets/SKILL.md
+++ b/skills/assets/SKILL.md
@@ -377,12 +377,17 @@ pub fn transfer_asset(
 
 SAC implements the standard SEP-41 token interface:
 - `balance(id: Address) -> i128`
-- `transfer(from: Address, to: Address, amount: i128)`
-- `approve(from: Address, spender: Address, amount: i128, expiration_ledger: u32)`
+- `transfer(from: Address, to: MuxedAddress, amount: i128)`
+- `transfer_from(spender: Address, from: Address, to: Address, amount: i128)`
+- `approve(from: Address, spender: Address, amount: i128, live_until_ledger: u32)`
 - `allowance(from: Address, spender: Address) -> i128`
 - `decimals() -> u32`
 - `name() -> String`
-- `symbol() -> Symbol`
+- `symbol() -> String`
+
+Only `transfer` takes a `MuxedAddress` destination. The generated
+`TokenClient` accepts `impl Into<MuxedAddress>` there, so pass an `&Address`
+as `&to` (as above), never `&to.into()`, which fails to compile (E0283).
 
 ## When to Use What