{"name":"CLAUDE_CODE_THISTLE_GREBE","slug":"claude-code-thistle-grebe","family":"env","title":"Environment variables","noun":"environment variable","description":"Subagent delegation nudges are now switched off for Opus 5; you can also control them by env var.","description_source":"entry","described_by":{"version":"2.1.219","anchor":"subagent-delegation-nudges-can-now-be-suppressed-by-the-mode"},"presence":{"first_seen":"2.1.215","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":82,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.227","anchor":"prompt-section-discouraging-over-delegation-to-subagents","heading":"Prompt section discouraging over-delegation to subagents","line":"Claude can be told to stop over-spawning subagents for small tasks, but that guidance is absent by default.","released_at":"2026-08-10 20:56:57","reason":"named in this entry, found in this entry's text"},{"version":"2.1.219","anchor":"subagent-delegation-nudges-can-now-be-suppressed-by-the-mode","heading":"Subagent-delegation nudges can now be suppressed by the model itself","line":"Subagent delegation nudges are now switched off for Opus 5; you can also control them by env var.","released_at":"2026-07-24 16:11:49","reason":"named in this entry, found in this entry's text"},{"version":"2.1.219","anchor":"subagent-steering-can-be-resolved-per-model","heading":"Subagent steering can be resolved per model","line":"Subagent nudging behaviour can be picked per model, but the whole feature stays behind a gate.","released_at":"2026-07-24 16:11:49","reason":"named in this entry, found in this entry's text"},{"version":"2.1.215","anchor":"subagent-delegation-steering-via-claude-code-thistle-grebe","heading":"Subagent Delegation Steering via CLAUDE_CODE_THISTLE_GREBE","line":null,"released_at":"2026-07-19 00:53:37","reason":"found in this entry's text"}],"entries_total":4,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"CLAUDE_CODE_3P_PROBE_WROTE_HAIKU_DEFAULT","slug":"claude-code-3p-probe-wrote-haiku-default","description":"If your cloud account cannot use a model, Claude Code can step down to the next one; `CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACK` turns this off"},{"name":"CLAUDE_CODE_3P_PROBE_WROTE_OPUS_DEFAULT","slug":"claude-code-3p-probe-wrote-opus-default","description":"Internal marker on third-party providers. When Claude Code itself writes `ANTHROPIC_DEFAULT_OPUS_MODEL` into its environment (the model availability probe on Bedrock, Vertex or Mantle, or a move down the model fallback ladder), it sets this variable to the same model ID. An `ANTHROPIC_DEFAULT_OPUS_MODEL` equal to it is treated as Claude Code's own choice rather than a user pin: it does not count as pinned, the probe does not skip it, and the fallback ladder may move it."},{"name":"CLAUDE_CODE_3P_PROBE_WROTE_SONNET_DEFAULT","slug":"claude-code-3p-probe-wrote-sonnet-default","description":"On third-party providers, Haiku model names are no longer skipped by the check that sets up the Sonnet default model"},{"name":"CLAUDE_CODE_3P_SEEDED_OPUS_DEFAULT","slug":"claude-code-3p-seeded-opus-default","description":"If your cloud account cannot use a model, Claude Code can step down to the next one; `CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACK` turns this off"},{"name":"CLAUDE_CODE_3P_SEEDED_SONNET_DEFAULT","slug":"claude-code-3p-seeded-sonnet-default","description":"If your cloud account cannot use a model, Claude Code can step down to the next one; `CLAUDE_CODE_DISABLE_MODEL_ACCESS_FALLBACK` turns this off"},{"name":"CLAUDE_CODE_ACCESSIBILITY","slug":"claude-code-accessibility","description":"Set to `1` to keep the native terminal cursor visible and disable the inverted-text cursor indicator. Allows screen magnifiers like macOS Zoom to track cursor position"},{"name":"CLAUDE_CODE_ACCOUNT_TAGGED_ID","slug":"claude-code-account-tagged-id","description":"Overrides the `user.account_id` attribute Claude Code attaches to its OpenTelemetry data. It applies only when an account UUID is known and `OTEL_METRICS_INCLUDE_ACCOUNT_UUID` is not turned off (default on); when unset or empty, `user.account_id` is derived from the account UUID as a tagged ID of the form `user_01...`."},{"name":"CLAUDE_CODE_ACCOUNT_UUID","slug":"claude-code-account-uuid","description":"The device bridge is skipped entirely when the host's account UUID doesn't match the stored one."},{"name":"CLAUDE_CODE_ACT_DONT_REDERIVE","slug":"claude-code-act-dont-rederive","description":"Three existing feature gates moved position; their defaults are unchanged."},{"name":"CLAUDE_CODE_ACTION","slug":"claude-code-action","description":"Marks a run as coming from the Claude Code GitHub Action. A truthy value (`1`, `true`, `yes` or `on`) makes Claude Code set `CLAUDE_CODE_ENTRYPOINT` to `claude-code-github-action`, but only when `CLAUDE_CODE_ENTRYPOINT` is not already set and the command is not `claude mcp serve`. It is also reported as `isClaudeCodeAction` in the environment details attached to telemetry."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/claude-code-thistle-grebe","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}