tengu_mcp_discovery_cache_enable

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.238, including the newest one read.

Releases whose published page names tengu_mcp_discovery_cache_enable.

1. v2.1.238 20 Aug 2026
   Calling a tool on a disabled MCP server errors instead of quietly reconnecting

   Calling a tool on a disabled MCP server would tell you to re-enable it, but that path is off.

   gate cited by this entry, found in this entry's text

2. v2.1.238 20 Aug 2026
   The MCP discovery cache is now off unless explicitly turned on

   The MCP discovery cache flipped from on-by-default to off unless the server or you enable it.

   gate cited by this entry, found in this entry's text

3. v2.1.238 20 Aug 2026
   MCP work aborts when the signed-in account changes mid-flight

   Switching accounts would cancel in-flight MCP work instead of finishing it under the new identity, but it's dark.

   gate cited by this entry, found in this entry's text

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

The earliest release whose published evidence quoted tengu_mcp_discovery_cache_enable was v2.1.238, 20 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.