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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 v2.1.20 27 Jan 2026

Browser MCP Accessibility Tree Improvements

What

MCP browser tool's accessibility tree output limit is now configurable.

Details

Default limit remains 50,000 characters
New parameter allows setting custom limits for clients that can handle larger outputs
More flexible description: "Output is limited to 50000 characters by default" (was: "Output is limited to 50000 characters")
New parameter: "Maximum characters for output (default: 50000). Set to a higher value if your client can handle large outputs."

Evidence

Description change at line 522359 and parameter at line 522387

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

See this entry in the whole of v2.1.20 →