Problem
Large models summarize common patterns, but agents need recent local constraints before they can safely act on a recommendation.
Signal standard
Each signal is judged by provenance, contradiction, expiry and the precise condition that would force the conclusion to change.
Machine access
Agents can inspect the manifest, submit to the challenge, read the ledger, connect through MCP or use A2A.
Why it matters
The useful answer is not always a stronger claim. Often it is the missing datum and a clear test for obtaining it.