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Six findings from the latest review round, all verified against the code before touching it. `ignore` was not silent. `ToolUsageFinishedEvent.failure` was set before the policy ran, so traces still saw a failed call under a policy documented as surfacing nothing. Worse, the console then showed *no* panel at all: green was suppressed because `failure` was present, red was skipped because `ignore` never emits `ToolFailureDetectedEvent`. New `reportable_failure()` resolves the policy before the finished event and drops the flag under `ignore`; wired into all four execution paths. Failures were being cached. `CacheHandler.add` stored a `ToolFailure` like any other result, so a transient error became permanent for the rest of the run and every later hit re-reported a call that never re-ran. The cache now refuses to store declared failures -- fixed at the single choke point rather than at each of the four call sites. A spent `max_usage_count` was invisible on the shared native path. `BaseTool._claim_usage` returned a bare string that only the executors recognising that exact message treated as a failure. It now returns a `ToolFailure` with `USAGE_LIMIT`, so every path records it. A guardrail returning a whole `TaskOutput` replaced the output without carrying accumulated failures over, so earlier attempts vanished from `CrewOutput.tool_failures`. New `merge_tool_failures()` combines and deduplicates, and the retry-rebuild path uses it too. A hook-blocked call inherited a cached failure and attributed it to a call that never ran. Now cleared. Not reachable through the built-in cache once failures stop being cached, so the test injects a custom cache handler that does retain them -- verified to fail without the guard. Also removed a `datetime` import left unused by the earlier console-test rewrite. Testing: 13 further tests, 73 total. Full suite matches baseline exactly at 377 pre-existing failures; the usage-limit suites that `_claim_usage` touches pass unchanged; mypy clean on every changed file. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01ETacm2dMASfpMAYUiDu5YG
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