Claude Code Fixes MCP Servers From `--mcp-config` Not Connecting Before the First Turn in Print Mode
Claude Code Changelog·medium signal
In 2.1.221, MCP servers passed via `--mcp-config` were not connected before the first turn under `-p`/print mode, which made the model emit tool calls as literal text instead of invoking them. Anyone scripting headless Claude Code runs with `-p` and custom MCP servers has likely seen silent no-op turns from this and blamed the prompt. The same release also fixes a crash when preparing API requests for SDK MCP tools named after built-in object properties such as `constructor`.