tengu_mcp_retry_on_tools_list_error
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.152 and was gone by v2.1.154.
Default false. When an MCP server connects but its tools/list call failed, and the server's transport is neither stdio nor sdk, Claude Code marks it pending and reconnects to retry, up to 3 times with exponential backoff starting at 1000 ms and capped at 30000 ms. Off, the server stays connected with the tools-list error.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.153 bundle, and it can be wrong.
In the changelogs
0No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.152 without anybody writing a line about it.
Gate readings
0No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
2Build by build
136One 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.