catalog.allowedReport returns the allowed lists together with the first
provider error. Widening (stateful) and the stateless refresh leave the
cached server and its recorded fingerprint untouched on an error, so the
next request retries instead of the tools staying hidden until the next
rotation or event. A fan-out recompute still applies its fail-closed diff
but records no fingerprint, so the binding's next request re-filters.
TestWideningGuardError fails the guard during a widening on both paths and
during a permissions recompute, then asserts that the next request lists
every tool once the provider answers again.
The identity fingerprint no longer includes token ids: guards decide on
scopes, subjects and the ceiling, and an OAuth access token's id changes on
every refresh, so a rotation alone no longer re-filters a cached server.
The stateless path's refresh only adds tools and prompts for a fingerprint
new to the entry (remembered until a fan-out recompute) and never removes:
one server serves every live token of a binding, and removing on each
alternation between a wider and a narrower token pulled a tool from under
the wider token's call. The receiving middleware still filters every list
and call per request; fan-out recomputes still narrow. The stateful path
keeps its exact widen, a session serves one client.
TestFingerprintIgnoresTokenID pins the fingerprint; TestStatelessSharedBinding
blocks the wide token's call after its server was chosen, sends a request
of the narrow token and asserts the call still succeeds (it failed with
"unknown tool" before).
