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Tip: MCP Stdio Servers Now Receive CLAUDE_CODE_SESSION_ID for Session-Aware Tool Behavior

Claude Code Changelogmedium signal

Claude Code 2.1.154 adds CLAUDE_CODE_SESSION_ID and CLAUDECODE=1 to the environment of stdio MCP server subprocesses. MCP server authors can now build session-aware behavior — caching per session, logging session boundaries, or correlating tool calls back to specific Claude Code runs. Simple change, but enables a class of stateful MCP patterns that previously required workarounds.

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