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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

MCP notification handlers registered through one helper

Under the hood

Useful1 Signal0

MCP

MCP notification wiring for VS Code and daemon sessions now goes through one shared path.

What

The claude-vscode and ccd_session notification wiring no longer reaches into the raw client.

Details

both paths call a single registration helper that takes the server entry, instead of calling setNotificationHandler directly

Evidence

tengu_feedback_survey_event

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 →