MCP_CONNECT_TIMEOUT_MS

Updated October 13, 2026 by Alex Sorokoletov

MCP_CONNECT_TIMEOUT_MS is a Claude Code environment variable. Its release history is not tracked here. It is listed in the official reference.

Status	Present in v2.1.294
Category	Network and proxy
Official docs	Listed

How to set it

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

export MCP_CONNECT_TIMEOUT_MS=<value>
claude

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

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

Related variables

CLAUDE_CODE_CONNECT_TIMEOUT_MS
CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT
MCP_TIMEOUT: MCP server connection timeout.
MCP_TOOL_TIMEOUT: Individual MCP tool execution timeout.
CLAUDE_CODE_SYNC_PLUGINS_MCP_TIMEOUT_MS
API_FORCE_IDLE_TIMEOUT
API_TIMEOUT_MS: Request timeout in milliseconds.
BASH_DEFAULT_TIMEOUT_MS

Frequently asked questions

Which Claude Code version has MCP_CONNECT_TIMEOUT_MS?

Its release history is not tracked here.

How do I set MCP_CONNECT_TIMEOUT_MS?

Export it before starting Claude Code (export MCP_CONNECT_TIMEOUT_MS=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.