tool.description-collision

heuristicunmeasuredseverity: medium

Not yet measured

This is a planned measured rule (SPEC §8). It is currently tier heuristic with no committed eval. It reports nothing and gates nothing until its battery passes the recomputed admission test. Running that battery costs API spend and requires explicit approval; it is out of scope for this build. The tier flips to enforced / measured only when the evidence is committed to evals/rules/tool.description-collision/ and verified in CI.

Claim

Two tools in one set describe themselves so similarly the model cannot reliably choose between them.

Rationale

Detector + committed eval land at M5 (SPEC §8); until the admission test passes, this rule reports nothing and gates nothing.

Fix

Differentiate the descriptions: name the distinct trigger for each tool, not the shared capability.

chaff explain tool.description-collision: same registry, offline, from the CLI.