{"name":"tengu_non_deferrable_builtins","slug":"tengu-non-deferrable-builtins","family":"flag","title":"Feature flags","noun":"feature flag","description":"Default `null`. A list of tool names that tool search does not defer, so they are loaded with the request. The value may be a plain array or an object keyed by model name substring with a `*` fallback; it is merged with a `non_deferrable_builtins` list from another config source, and its entries also feed a set of MCP server names alongside the always-allow rules.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.176","removed_in":null,"in_current_build":true,"newest_mined":"2.1.309","builds":116,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[],"entries_total":0,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_nonblocking_stdout","slug":"tengu-nonblocking-stdout","description":"Failures installing the fast, non-blocking stdout writer now log more detail and report telemetry once per reason"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-non-deferrable-builtins","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}