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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.219

Subagent-delegation nudges can now be suppressed by the model itself

Use it now
Useful3 Signal0
System Prompt Notable not in their notes

Subagent delegation nudges are now switched off for Opus 5; you can also control them by env var.

CLAUDE_CODE_THISTLE_GREBE
What

The prompt block that nudges Claude to delegate to subagents can be turned off based on the model, not just by env var, client data or remote config.

Details
  • resolution order was env CLAUDE_CODE_THISTLE_GREBE, then client data, then growthbook; a fourth model-derived resolver was added
  • the model resolver returns no_nudges for models carrying the opus_5_prompt_bundle capability, suppressing the "## Delegating to subagents" block
  • telemetry reports source: "model" when this path decides
Evidence

tengu_subagent_steer_applied

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.219 →