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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_negotiation_server_denylist

A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

Remote config can force legacy MCP handshakes or suppress listening for named servers, matched by hostname.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.234.

Presence across releases

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Gate readings

No 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.

Changelog entries naming it

  1. v2.1.234MCP protocol negotiation can be disabled per server from remote config

    Remote config can force legacy MCP handshakes or suppress listening for named servers, matched by hostname.

    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.