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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 v2.1.221 3 Aug 2026

New telemetry for post-install plugin activation

Under the hood

Useful2 Signal0

Plugins

Claude now records whether a freshly installed plugin actually activated, and why it didn't.

What

The in-session activation helper reports whether it managed to bring the plugin up and why not when it did not.

Details

Emits tengu_plugin_install_auto_activate with activated, true when nothing blocked it, and a reason field on failure.
Separately records outcomes under the name "plugin_install_auto_activate" with reasons "cache_impact", "refresh_failed" and "plugin_load_error".
Fires wherever the install flow runs.

Evidence

tengu_plugin_install_auto_activate

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

See this entry in the whole of v2.1.221 →