diff --git a/README.md b/README.md
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@@ -1,3 +1,5 @@
 # crucible-agent-maintain-only-latest
 
-Auto-generated tool: Maintain only the latest check result for each monitored target in concurrency-safe memory and expose it through the specified FastAPI current-status endpoint.
\ No newline at end of file
+> Maintain only the latest check result for each monitored target in concurrency-safe memory and expose it through the specified FastAPI current-status endpoint.
+
+A tool, not a standing agent service — see `input.schema.json`/`output.schema.json` for its contract. Generated by crucible-agent-decomposer for a plan gap step; language and structure are whatever the capability actually needs, not a fixed layout.