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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 v2.1.208

Official plugin prompt overrides via server-side feature flag

What

Anthropic can now push prompt overrides for official (first-party) plugins via the tengu_official_plugin_prompt_overrides GrowthBook feature flag. This allows updating plugin instructions server-side without requiring a CLI release.

Details
  • Applies only to plugins from Anthropic's marketplace or known official plugin names
  • Overridable fields: server_instructions, server_instructions_by_server, tools, search_hints, param_descriptions, prompts, skills
  • If the GrowthBook payload fails schema validation, the baked-in plugin text is used and an error is logged
  • Per-server instruction overrides via server_instructions_by_server let different MCP servers within the same plugin get different instructions
Evidence

Plugin prompt override (search for "tengu_official_plugin_prompt_overrides")

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

See this entry in the whole of v2.1.208 →