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Add the Pieces MCP server to Claude Code

Config last verified Nov 10, 2026

The exact config to run Pieces in Claude Code — paste it in, restart, and the tools load.

Prerequisites

  • Claude Code installed.

Setup

1. Open ~/.claude.json

2. Add this configuration

Add to ~/.claude.json

~/.claude.json
json
{
  "mcpServers": {
    "pieces": {
      "type": "http",
      "url": "http://localhost:39300/model_context_protocol/2025-03-26/mcp"
    }
  }
}
Or via CLI
bash
claude mcp add --transport http pieces http://localhost:39300/model_context_protocol/2025-03-26/mcp

3. Restart Claude Code and confirm the Pieces tools load.

Gotchas

Claude Code stores MCP servers under an "mcpServers" object in ~/.claude.json. It also reads a project-scoped .mcp.json and supports adding servers from the command line with "claude mcp add". Each entry must declare either a "type" or a "command"; Claude Code refuses an entry that has neither. Remote servers connect natively over Streamable HTTP with OAuth.

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