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

1. Sign up for Harmonica (free)
2. Go to Profile > API Keys > Generate API Key
3. 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, project_id to file it under a project)
update_session	Update session metadata (topic, goal, context, critical, prompt; project_id to move it into a project or null to detach)
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)
install_method_spec	Install an OFL method spec (method.md) as a runnable chain template
create_project	Create a project (workspace) to group related sessions
list_projects	List the projects (workspaces) you have access to
get_project	Get a project by id, with the ids of its linked sessions
update_project	Rename a project or update its description (editor access)
delete_project	Soft-delete a project; its sessions are left intact (owner access)
create_unconference_topic	Create a draft topic in an Unconference project and mirror it to the connected brain repository (editor access)
publish_sensemaking_topic	Publish a project as a public sensemaking topic (/explore + /t/[slug])

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

See Also

• harmonica-chat — Conversational Harmonica companion for Claude Code — design, create, and manage sessions (/harmonica-chat)
• Harmonica docs — Full platform documentation and API reference

License

MIT