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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

One change

Connect Claude Code to tools via MCP

mcp

first seen The page's own history The capture it came from

Nearest release: v2.1.238, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

mcp Changed · +0 / -6 lines

### How it works

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   Tool search isn't supported on Microsoft Foundry [deployments hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options), which reject it server-side: Claude Code detects the rejection and loads MCP tools upfront for that deployment instead. [`ENABLE_TOOL_SEARCH`](#configure-tool-search) can't override this, since the rejection comes from the deployment itself.
 </Note>
 
-### How it works
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-Tool search is enabled by default. MCP tools are deferred rather than loaded into context upfront, and Claude uses a search tool to discover relevant ones when a task needs them. Only the tools Claude actually uses enter context. From your perspective, MCP tools work exactly as before.
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-If you prefer threshold-based loading, set `ENABLE_TOOL_SEARCH=auto`. Claude Code then loads every schema upfront while the definitions it would otherwise defer total less than 10% of the context window, and defers every one of those definitions once they reach 10%. See [Configure tool search](#configure-tool-search) for all options.
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 ### For MCP server authors
 
 If you're building an MCP server, the server instructions field becomes more useful with tool search enabled. Server instructions help Claude understand when to search for your tools, similar to how [skills](/docs/en/skills) work.