Models carrying the opus-5 prompt bundle now receive a built-in instruction telling Claude not to spawn subagents or run workflows and deep-research unless the user asked for it.
- the
tengu_heron_brookinjection previously came only from client data or the remote flag string; it now falls back to a built-in two-line block - the fallback applies when the model carries the opus_5_prompt_bundle capability
- killswitch is
tengu_fennel_godwit - the applied event still fires as
tengu_heron_brook_appliedwithfromClientData: !1on this path
Do not use workflows or deep-research 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.
tengu_fennel_godwit Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · 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
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
New in this build: tengu_fennel_godwit