CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS

Updated October 14, 2026 by Alex Sorokoletov

CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS is a Claude Code environment variable. Added between v2.1.269 and v2.1.283 and still present in v2.1.295. It is not in the official reference.

Status	Present in v2.1.295
Added	Added between v2.1.269 and v2.1.283
Category	Network and proxy
Official docs	Not listed

How to set it

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

export CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS=<value>
claude

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

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

Related variables

CLAUDE_CODE_MCP_SERVER_URL: The companion to MCP_SERVER_NAME, providing the server endpoint URL.
CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT
MCP_CONNECT_TIMEOUT_MS
MCP_CONNECTION_NONBLOCKING: Make MCP connections non-blocking.
MCP_REMOTE_SERVER_CONNECTION_BATCH_SIZE: Remote MCP connection batch size.
MCP_SERVER_CONNECTION_BATCH_SIZE: Concurrent MCP server connections.
MCP_TIMEOUT: MCP server connection timeout.
MCP_TOOL_TIMEOUT: Individual MCP tool execution timeout.

Frequently asked questions

Which Claude Code version has CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS?

Added between v2.1.269 and v2.1.283 and still present in v2.1.295.

How do I set CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS?

Export it before starting Claude Code (export CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_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.