What
A new event records where a server's tools came from, distinguishing real cache misses from deliberate bypasses.
Details
tengu_mcp_discovery_sourcereportscache_freshorcache_stalefor hits, and a normalized reason otherwise.- Reasons meaning "we connected anyway" collapse to
live. - Genuine misses report
miss_disabled,miss_expired,miss_corrupt,miss_strikeormiss_no_fingerprint. - Two mapped reasons are new opt-outs:
skills-capableandchannel-capableservers deliberately bypass the cache. - Gated on
tengu_mcp_discovery_cache, which falls back to enabled.
Evidence
miss_no_fingerprint
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Feature flag
tengu_mcp_discovery_cache Not enough to sayNothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.
This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.221: on
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.221. It isn't a statement about your account. What a flag value here can and cannot tell you
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this build
New in this build: tengu_mcp_discovery_cache