CLAUDE_CODE_TOOL_MEMORY_LIMIT

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_TOOL_MEMORY_LIMIT is a Claude Code environment variable. Added between v2.1.229 and v2.1.234 and still present in v2.1.294. It is listed in the official reference.

How to set it

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

export CLAUDE_CODE_TOOL_MEMORY_LIMIT=<value>
claude

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

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

Release notes that mention it

• claude-code-env-vars-v2-1-234

Related variables

• CLAUDE_CODE_TOOL_MEMORY_CGROUP_EXCLUDE
• 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_EXPERIMENTAL_ADVISOR_TOOL: Enables the experimental Advisor Tool — a server-side tool with its own advisorModel config option.
• CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY: Max concurrent tool executions; default 10.
• CLAUDE_CODE_USE_POWERSHELL_TOOL: Enables a PowerShell-specific tool variant for Windows environments.
• ENABLE_LSP_TOOL: Enable Language Server Protocol tool.
• ENABLE_TOOL_SEARCH: Tool search/deferred loading: auto, true, false, or 0–100%.

Frequently asked questions

All variables, searchable: Claude Code environment variables.