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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 v2.1.119

MCP Completion Support (McpCompletable)

What

Added support for MCP completion/autocomplete of prompts and resource templates.

Details
  • New McpCompletable type registered as Symbol.for("mcp.completable")
  • Validates completion request types: prompts must use ref/prompt, resource templates must use ref/resource
  • Provides structured error messages: "Expected CompleteRequestPrompt, but got ..." / "Expected CompleteRequestResourceTemplate, but got ..."
Evidence

MCP completions (search for "McpCompletable", "mcp.completable", "Expected CompleteRequestPrompt")

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

See this entry in the whole of v2.1.119 →