ENABLE_TOOL_SEARCH

Updated October 13, 2026 by Alex Sorokoletov

ENABLE_TOOL_SEARCH is a Claude Code environment variable: Tool search/deferred loading: auto, true, false, or 0–100%. Its release history is not tracked here. It is listed in the official reference.

Status	Present in v2.1.294
Category	Shell and tools
Official docs	Listed

How to set it

For one session, export it in the shell that starts Claude Code:

export ENABLE_TOOL_SEARCH=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "ENABLE_TOOL_SEARCH": "<value>"
  }
}

Related variables

CLAUDE_CODE_ENABLE_EXPERIMENTAL_ADVISOR_TOOL: Enables the experimental Advisor Tool — a server-side tool with its own advisorModel config option.
ENABLE_LSP_TOOL: Enable Language Server Protocol tool.
CLAUDE_CODE_DISABLE_ADVISOR_TOOL: Disables what appears to be an internal advisory tool.
CLAUDE_CODE_EMIT_TOOL_USE_SUMMARIES: Emit tool use summary events.
CLAUDE_CODE_ENABLE_TODO_TOOLS
CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY: Max concurrent tool executions; default 10.
CLAUDE_CODE_TOOL_MEMORY_CGROUP_EXCLUDE
CLAUDE_CODE_TOOL_MEMORY_LIMIT

Frequently asked questions

What does ENABLE_TOOL_SEARCH do?

Tool search/deferred loading: auto, true, false, or 0–100%

Which Claude Code version has ENABLE_TOOL_SEARCH?

Its release history is not tracked here.

How do I set ENABLE_TOOL_SEARCH?

Export it before starting Claude Code (export ENABLE_TOOL_SEARCH=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.

All variables, searchable: Claude Code environment variables.