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Glossary · Learn more

MCP Tool Search

Loading tool details only when they are needed. See what it is, how it works, how it is used and what to watch for, with pictures and examples.

Back to the glossary Claude Code
A purple card catalog where one drawer opens to bring out a single full manual while the rest stay closed.

What it is

Tool Search saves room in the . MCP can bring many tools, and each tool has a long description called a . At the start, loads only the tool names and the server instructions. When decides to use a tool, it fetches that tool's full schema then, so servers you are not using take up little .

How it works

  1. Session starts with tool names only
  2. Claude needs a certain MCP tool
  3. Claude searches and loads its schema
  4. Claude calls the tool as usual

How to use it

  1. /context

    shows what uses space; deferred tools are marked as deferred or loaded on demand.

  2. ENABLE_TOOL_SEARCH=false claude

    turns tool search off and loads every MCP tool up front.

  3. ENABLE_TOOL_SEARCH=auto:5

    loads tools up front until they pass 5% of the context window, then switches to search.

  4. "alwaysLoad": true

    in a server's .mcp.json entry, keeps that server's tools always visible.

Watch out

Tool search is on by default, but it works only on newer such as Claude Opus 4, Sonnet 4, Haiku 4.5 and later; on older models all tools load up front. Every tool you load up front with alwaysLoad uses context on every turn, so use it for only a few tools. Server authors should write clear, short instructions, because Claude reads them to know when to search for their tools.

Original and official docs

This page explains the term in plain words. The original is the authority: if they differ, follow the original.

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