An internal advisor model concept exists, with sub-agents told never to consult it, and only runs under first-party auth plus a flag.
Claude Code now supports an internal 'advisor' model concept, surfaced through the query context via getAdvisorSetting/advisorModel. When the advisor is active and the session isn't compacting, an internal meta message, Never consult the advisor tool., is injected into forked-agent prompts so sub-agents don't recursively call it. The advisor tool itself only runs when first-party auth is combined with a support flag or a remote experiment.
tengu_sage_compass2 Not enough to sayNothing 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 v2.1.257: no gate table built for this version
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 v2.1.257. It isn't a statement about your account. What a flag value here can and cannot tell you
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
| `--advisor <model>` | Enable the server-side [advisor tool](/docs/en/advisor) for this session with a model alias, `fable`, `opus`, or `sonnet`, or a full model ID. Takes precedence over the `advisorModel` setting for the session. `fable…cli-reference see the edit
Anthropic's documentation has since written up advisorModel, on CLI reference.