diff --git a/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json b/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json
index 7719bd3193..aed34842df 100644
--- a/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/session-query-spill/tool-schemas.expected.json
@@ -298,7 +298,7 @@
     },
     {
       "name": "session_event_trace",
-      "description": "Read every direct replacement and provenance relationship for one event in an authorized session.",
+      "description": "Read every direct replacement and relationship to a cited source event for one event in an authorized session.",
       "parameters": {
         "type": "object",
         "properties": {