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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 v2.1.122 28 Apr 2026

"workspace" Reserved as MCP Server Name

What

The name "workspace" is now reserved and cannot be used when adding a custom MCP server.

Details

Attempting to add an MCP server named "workspace" will throw: Cannot add MCP server "workspace": this name is reserved.

Evidence

New reserved name check (search for xeH = "workspace" at line ~55807)

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

See this entry in the whole of v2.1.122 →