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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.

← All of v2.1.251 Home All releases ←olderv2.1.250

Claude Code v2.1.251 28 Aug 2026

MCP tools no longer blocked by a name clash with a built-in tool

You'll notice

Useful4 Signal2

MCP

An MCP tool sharing a name with a built-in tool is no longer silently blocked.

What

A tool provided by an MCP server is now treated as enabled if a built-in tool of the same name is enabled, closing a case where a name collision could silently block the MCP tool despite permissions allowing it.

Details

Unconditional.

Evidence

n.mcpInfo === void 0

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

See this entry in the whole of v2.1.251 →