Models advertising a new capability get an appended prompt block telling the model not to reach for subagents or research workflows unprompted, and the matching steering nudge is turned off for them.
- gated on the
opus_5_prompt_bundlecapability, with a remote kill-flag checked inside the capability test (fallback: not killed) - the appended block reads "Do not call the AgentTool unless the user requested it" and "Do not use workflows or deep-research unless the user requested it"
- application is logged as
tengu_heron_brook_appliedwithfromClientData: !1 - the
tengu_heron_brookstring flag still overrides - the same capability check feeds the "thistle grebe" steering resolver with a new "model" source returning "no_nudges", suppressing the delegate-to-subagents steering text
Do not call the AgentTool unless the user requested it
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_heron_brook 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 v2.1.219: not a boolean we can read
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 v2.1.219. It isn't a statement about your account. What a flag value here can and cannot tell you