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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 v2.1.251

Plugins can now hook agent offers, skill prompts and attribution text

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Useful4 Signal4
Plugins Notable

Plugins can now control which subagents are offered, skill prompt text, and commit attribution.

What

Three new points where a plugin can intervene: whether a given subagent type is offered to the model, the text of a skill's prompt before it is used, and the attribution text attached to commits and PRs. Each runs only if a plugin registered a handler for it; otherwise Claude Code's own default behavior runs unchanged.

Details
  • The agent offer point checks whether any handler is registered for that event before filtering the candidate agent list, so no handler means no extra work.
  • The attribution point is called by the builder that produces commit and PR attribution text, so a plugin can rewrite what gets committed.
  • Each event carries the subject with it: the agent offer event is matched on the agent, its description and its source, and answered with a boolean saying whether to offer it.
Evidence

hasModuleHandlers("agent.offer", { agent: r.agentType }), "skill.prompt": X.SKILL_PROMPT, attribution.text

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

See this entry in the whole of v2.1.251 →