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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial

The gate behind MCP error-throwing now reads under the name tengu_tranquil_fern instead of tengu_repl_mcp_error_throw

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaGateswhat it touches
KindInternal Changesin v2.1.275,
Under the hood No documentation found

The gate behind MCP error-throwing now reads under the name tengu_tranquil_fern instead of tengu_repl_mcp_error_throw

What

The internal helper that used to check a gate (an internal on/off switch) named tengu_repl_mcp_error_throw now instead checks a gate named tengu_tranquil_fern, with the same default of enabled.

Why

This looks like a rename rather than a behavior change, continuing this gate's history: it was previously documented as one of a small set of flags whose value gets pinned for the life of a session so a remote configuration change mid-session can't flip it, and was compiled on at that time.

Read from
Names in the bundletengu_tranquil_fern
Feature flag
tengu_tranquil_fern Not enough to say

Nothing 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 v2.1.275: 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.

tengu_repl_mcp_error_throw Not enough to say

Nothing 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 v2.1.275: not a boolean we can read

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 v2.1.275. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtNothing has been read about either `tengu_tranquil_fern` or `tengu_repl_mcp_error_throw` under this release, so their current state for this…

See this entry in the whole of v2.1.275 →

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