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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / Feature flags

tengu_mcp_normalize_root_combinators

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.195 and was gone by v2.1.216.

What it is

Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.216 – 2.1.243 27 releases not in the build — —
2.1.195 – 2.1.215 21 releases in the build — unknown

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.216 read on another version Not enough to say no value returned no value returned not a boolean we can read
v2.1.195 read on another version Not enough to say no value returned no value returned not a boolean we can read

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.

Changelog entries naming it

  1. v2.1.216MCP Tool Schema Validation Upgraded to JSON Schema Draft 2020-12

    gate cited by this entry

  2. v2.1.195MCP Tool Schema Normalization

    gate cited by this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu_mcp, up to twelve of them.

tengu_mcp_auto_backgroundNo description from anybody. 2.1.212 tengu_mcp_cgroupOn Linux you can force MCP servers into their own memory cgroup with an environment variable. never mined tengu_mcp_claudeai_eligibility_gateNo description from anybody. 2.1.212 tengu_mcp_cli_command_executedNo description from anybody. never mined tengu_mcp_connect_timeout_retryMCP connect timeouts now respect the global timeout and get retried instead of failing. 2.1.227 tengu_mcp_degradedMCP events are forwarded for logging with identifying fields stripped, and skipped entirely if analytics are off. never mined tengu_mcp_directory_bffNo description from anybody. 2.1.138 tengu_mcp_directory_visibilityNo description from anybody. 2.1.138 tengu_mcp_discovery_cacheThe /mcp view now counts cached servers separately so you can tell them from live connections. 2.1.221 tengu_mcp_discovery_cache_enableCalling a tool on a disabled MCP server would tell you to re-enable it, but that path is off. 2.1.238 tengu_mcp_discovery_sourceStartup no longer dials cached HTTP or SSE MCP servers; they restore from cache and connect on first use. never mined tengu_mcp_drop_invalid_tool_schemasNo description from anybody. never mined

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.