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Reading a new release v2.1.251 Analysing changes · 2/5 Sorting the findings · 1/4 steps 470 findings $18.91 so far

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 v2.1.121

MCP Server alwaysLoad Option

What

New boolean configuration option for MCP servers that forces all tools from a server to always be included in the prompt, bypassing tool search deferral.

Details
  • Added to all MCP server config types: stdio, HTTP, and SSE
  • When true, tools are never deferred behind tool search
  • Equivalent to setting defer_loading: false on the API
  • Default behavior: tools are deferred when tool search is enabled
Evidence

MCP alwaysLoad option (search for "When true, all tools from this server are always included")

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

See this entry in the whole of v2.1.121 →