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Harmonica MCP

MCP server for Harmonica deliberation sessions — create, query, and analyze sessions from any AI agent

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Harmonica MCP Server

MCP server enabling AI agents to create and query Harmonica deliberation sessions.

Harmonica is a structured deliberation platform where groups coordinate through AI-facilitated async conversations. Create a session with a topic and goal, share a link with participants, and each person has a private 1:1 conversation with an AI facilitator. Responses are synthesized into actionable insights. Learn more.

Quick Start

1. Get an API key

Sign up for Harmonica (free)
Go to Profile > API Keys > Generate API Key
Copy your hm_live_... key — it's only shown once

2. Configure your MCP client

Add to your MCP client config (e.g. Claude Code, Cursor, Windsurf):

{
  "mcpServers": {
    "harmonica": {
      "command": "npx",
      "args": ["-y", "harmonica-mcp"],
      "env": {
        "HARMONICA_API_KEY": "hm_live_your_key_here"
      }
    }
  }
}

3. Start a deliberation

Ask your AI agent to create a session:

Create a Harmonica session about "Team Retrospective" with the goal "Review Q1 and identify improvements"

Share the join URL with participants. Once they've responded, use get_responses and get_summary to see the results.

Tools

Tool	Description
`create_session`	Create a new deliberation session and get a shareable join URL (optional: `questions`)
`update_session`	Update session metadata (topic, goal, context, critical, prompt)
`list_sessions`	List your deliberation sessions (filter by status, search)
`get_session`	Get full session details (includes facilitation prompt)
`get_questions`	Get pre-session questions (data collection form)
`get_responses`	Get participant responses
`get_summary`	Get AI-generated summary
`search_sessions`	Search by topic or goal
`list_telegram_groups`	List Telegram groups registered to the user's account (no parameters)

From Source

git clone https://github.com/harmonicabot/harmonica-mcp.git
cd harmonica-mcp
npm install && npm run build

Then use node /path/to/harmonica-mcp/dist/index.js instead of npx -y harmonica-mcp in your config.

Environment Variables

Variable	Required	Default	Description
`HARMONICA_API_KEY`	Yes	—	Your Harmonica API key
`HARMONICA_API_URL`	No	`https://app.harmonica.chat`	API base URL

Roadmap

One-command install via npx add-mcp (auto-detects Claude Code, Cursor, Windsurf)
HTTP transport — zero-install setup, just add a URL
Inbound context — feed external data into sessions via MCP
Session templates discovery tool
TypeScript and Python client SDKs

License

MIT