diff --git a/src/contracts/sessionToolContracts.ts b/src/contracts/sessionToolContracts.ts
index 3be958abdd..6fbb906faa 100644
--- a/src/contracts/sessionToolContracts.ts
+++ b/src/contracts/sessionToolContracts.ts
@@ -125,7 +125,7 @@ export const SESSION_TOOL_CONTRACTS = [
   ),
   session(
     "find_changed_behavior",
-    "Aggregate validated process and artifact comparison Evidence. Runtime observations remain distinct from static behavior candidates; missing or incomplete comparisons produce unresolved findings, never causal claims. Returns every finding inline.",
+    "Aggregate validated process, artifact, and function comparison Evidence. Runtime observations remain distinct from static behavior candidates; missing or incomplete comparisons produce unresolved findings, never causal claims. Returns every finding inline.",
     changedBehaviorInputSchema,
   ),
   session(