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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 v2.1.211

Auto Front-Load of Tab Context for Navigate Without tabId

What

When the navigate tool is called with a URL but no tabId, Claude in Chrome now automatically issues a tabs_context_mcp call in the background to acquire a tab, then injects the tab context into the result. The caller no longer needs to call tabs_context_mcp first for simple URL navigation.

Details
  • A short timeout bounds the background lookup; if it exceeds the limit, the tool returns an error instructing the caller to retry or call tabs_context_mcp explicitly.
  • url: "back" and url: "forward" still require an explicit tabId (they have no meaningful default).
  • The tab context JSON (from the front-loaded lookup) is appended to the successful navigate result for reference.
Evidence

Auto tab lookup logic (search for "The hidden tabs_context_mcp lookup did not respond within")

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

See this entry in the whole of v2.1.211 →