@chamade/mcp-server

MCP (Model Context Protocol) server for Chamade — a voice and chat gateway that lets your AI agent join meetings and DMs on Discord, Microsoft Teams, Google Meet, Telegram, SIP, Zoom, Nextcloud Talk, Slack, and WhatsApp.

The recommended voice path is hosted STT/TTS with bring-your-own-key. Drop your own ElevenLabs / Deepgram / OpenAI / Cartesia API key in your dashboard once — Chamade runs the full speech pipeline on its side using that key. Transcripts flow in as call_transcript events, chamade_call_say speaks into the meeting. Free on Chamade's side; you only pay your provider. Your agent stays fully text-driven.

Already have a voice pipeline you want to keep (OpenAI Realtime, LiveKit Agents, Pipecat, Deepgram Voice Agent, a manual cascade)? Chamade also exposes the call's raw-PCM audio as a bidirectional WebSocket — BYO audio, Chamade transports, you run the speech layer. Either mode, same MCP tools for control.

File attachments work out of the box on DMs and meeting chat for Discord, Telegram, Slack, WhatsApp (incl. voice notes), and Nextcloud Talk. Use chamade_file_upload_url to mint a pre-signed no-auth upload URL, then pass the returned file_id in attachments on chamade_dm_chat or chamade_call_chat. Inbound files arrive on chamade_inbox as Chamade-signed URLs — your agent can curl them with no extra auth. Teams + Meet support is code-ready but gated until the respective platform certifications complete.

Chamade is currently in early access: free, no subscription, no quota.

v4: hosted MCP + thin stdio shim

The Chamade MCP server is now hosted at https://mcp.chamade.io/mcp/ and speaks the Streamable HTTP transport. That's the single source of truth — every tool, every resource, every push event lives there.

• If your MCP client supports Streamable HTTP (Claude Desktop recent, Claude Code, Cursor, Windsurf, …), configure it directly against the hosted endpoint. You don't need this npm package.
• If your MCP client is stdio-only, install this package. Since v3 it's a ~160-line wrapper that spawns mcp-remote under the hood to bridge stdio to the hosted HTTP endpoint. Same tools, same push events, same latency. Zero drift because there is no parallel stdio implementation.

What changed in v4

v4 is a server-side wire-shape change picked up automatically by the shim. Headline items, full detail in docs/AGENTS.md:

• Channels are now Agents. Per-bearer scoping is unchanged; the noun is agent everywhere on the wire and in tool descriptions.
• account_id is the canonical join key. Used identically in chamade_dm_chat, chamade_call_join, event payloads, and reply XML tag attributes.
• Event payload v2. data carries account_id + from + from_name (sender_* fields removed) and a pre-stuffed agent_context.{accounts, active_calls} snapshot so the agent always knows what it's on without an extra round-trip.
• Explicit-target XML tags. Reply XML can now address conversations / calls outside the current reply context (<dm platform=…>, <call_say call_id=…>, …) for cross-target initiation.
• Auto-MCP attachment. Providers with native MCP-as-tool support (OpenAI Responses, Anthropic Managed Agents, Foundry) receive the Chamade MCP server pre-injected with a per-agent bearer.

Earlier versions of this package (v2.x and below) shipped a full native stdio server that implemented the 13 tools locally in TypeScript against Chamade's REST API. v3+ replaces that with a shim — please upgrade to avoid maintaining two surfaces that slowly diverge.

Quick start

Option A — HTTP direct (preferred)

If your client speaks Streamable HTTP, skip this package entirely:

{
  "mcpServers": {
    "chamade": {
      "type": "http",
      "url": "https://mcp.chamade.io/mcp/",
      "headers": {
        "Authorization": "Bearer chmd_..."
      }
    }
  }
}

Option B — stdio shim (this package)

For stdio-only clients:

{
  "mcpServers": {
    "chamade": {
      "command": "npx",
      "args": ["-y", "@chamade/mcp-server@3"],
      "env": {
        "CHAMADE_API_KEY": "chmd_..."
      }
    }
  }
}

CHAMADE_API_KEY is required. Get a real one at https://chamade.io/dashboard → API keys and paste the full chmd_… value (≥ 40 chars after the prefix). If the env var is missing, empty, or still contains a placeholder like chmd_..., the shim refuses to start instead of silently falling back to OAuth — that fallback path loops on refresh-and-revoke and is not a viable auth method for this server.

Configuration

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%/Claude/claude_desktop_config.json (Windows). Use Option A or B above.

Claude Code

.mcp.json at the root of your project. Use Option A (HTTP direct) for the best experience.

For real-time push events (transcripts, incoming DMs, ringing calls, WhatsApp dm_delivered flush), launch Claude Code with the channel flag every time:

claude --dangerously-load-development-channels server:chamade --continue

The flag is a per-launch client-side opt-in mandated by Claude Code for MCP channels not yet on the Anthropic allowlist — it's not dangerous, it's just the standard opt-in for experimental channels during the research preview. The server name after server: must match the key in your .mcp.json. Without the flag, tools still work but push events are silently ignored — you have to poll chamade_inbox and chamade_call_status to see new activity.

Cursor / Windsurf / OpenClaw

Same format. Path varies by client: .cursor/mcp.json, ~/.codeium/windsurf/mcp_config.json, ~/.openclaw/config.json. Use Option A if the client supports HTTP, otherwise Option B.

Tools

Tool	Description
chamade_call_join	Join a voice meeting (platform + meeting_url).
chamade_call_say	Speak text aloud via TTS in the meeting.
chamade_call_chat	Send a text chat message in the meeting. Optional attachments: [{file_id} | {url} | {bytes_b64, name, mime}] to send files along with the text; text becomes the caption when both are set. 25 MB cap per attachment.
chamade_call_status	Get call state and new transcript lines (delta pattern).
chamade_call_accept	Answer a ringing inbound call (SIP, etc.).
chamade_call_refuse	Refuse/reject a ringing inbound call.
chamade_call_typing	Send a typing indicator in meeting chat.
chamade_call_leave	Hang up and leave the meeting.
chamade_call_list	List all active calls.
chamade_inbox	Check DM conversations (Discord, Telegram, Teams, WhatsApp, Slack, NC Talk). Shows WhatsApp 24h window state inline. Inbound file attachments arrive as attachments[] on each message, with Chamade-signed URLs.
chamade_dm_chat	Send a DM message by platform. Optional attachments: [{file_id} | {url} | {bytes_b64, name, mime}] to send files; text becomes the caption. On WhatsApp outside the 24h window, returns 202 queued and auto-fires a re-engagement template.
chamade_dm_typing	Send a typing indicator in DM by platform.
chamade_file_upload_url	Mint a short-lived (5 min) pre-signed upload URL. Your shell / agent curl -F file=@path <url> with no auth header (URL itself is the auth), then pass the returned file_id in attachments: [{file_id}] on a subsequent send. Recommended path for any non-trivial local file — a shell-streamed upload keeps the tool call tiny instead of forcing every base64 character through the model's output budget.
chamade_account	Check account status, plan, credit/quota, and per-platform readiness (incl. a files bool per platform).

Resources

URI template	Description
chamade://calls/{call_id}/transcript	Live transcript. Each read returns only new lines since the last read (delta pattern). Channel-mode clients also receive push notifications for every new line.

Channel mode (push events)

Channel mode pushes DM messages, incoming SIP calls, transcript lines, call state changes, and WhatsApp dm_delivered flush events directly into the agent's context — no polling.

Server side — nothing to configure. The hosted Chamade MCP server always declares the experimental.claude/channel capability during the initialize handshake. The v2.x --channel arg / CHAMADE_CHANNEL=1 env var are gone.

Client side — Claude Code needs a per-launch flag. Claude Code only processes notifications/claude/channel from MCP servers you've explicitly opted in:

claude --dangerously-load-development-channels server:chamade --continue

Required every launch. Without it, Chamade tools still work but push events are silently dropped client-side — the agent has to poll chamade_inbox and chamade_call_status to see new activity.

Other MCP clients (Claude Desktop, Cursor, Windsurf) currently do not have a channel receiver and will silently ignore push notifications. They still work in polling mode via chamade_inbox with last_message_cursor + optional wait for long-polling.

Environment variables (shim only)

Only the stdio shim uses these. Direct HTTP config has everything in JSON.

Variable	Required	Default	Description
CHAMADE_API_KEY	Yes	—	API key (chmd_*, ≥ 40 chars of entropy) from chamade.io/dashboard. The shim validates the shape at startup and exits 1 on placeholders or missing values; there is no OAuth fallback.
CHAMADE_URL	No	https://chamade.io	Chamade instance URL. The shim derives the MCP endpoint automatically: https://chamade.io → https://mcp.chamade.io/mcp/, https://dev.chamade.io → https://mcp.dev.chamade.io/mcp/.
CHAMADE_MCP_URL	No	—	Explicit MCP endpoint override. Skip unless you're running a custom proxy.

The v2.x --channel CLI flag is silently accepted for backwards-compat, but it's a no-op — channel mode is always on in v3.

Supported platforms

• Discord — voice channels (shared bot or bring your own), text, files (send + receive, 25 MB)
• Microsoft Teams — voice meetings + text DM, requires OAuth connection on dashboard. Files code-ready, gated behind AppSource cert.
• Google Meet — voice (audio_in) + chat text, requires OAuth connection on dashboard (see note below). Files code-ready, gated behind Google OAuth verification.
• Telegram — DM text + files (send + receive). No voice.
• Zoom — voice + meeting chat, pass meeting URL (pending Zoom Marketplace approval — tester access on request). No files.
• SIP / Phone — voice only, pass phone number or SIP URI. No files.
• Nextcloud Talk — voice + text + files (send on any addon version, receive needs addon ≥ 2.4.0)
• WhatsApp — DM text + files (send + receive, incl. voice notes as raw audio). No voice calls.

⚠️ Google Meet voice — beta limitation. Real-time audio capture on Meet relies on Google's Meet Media API, currently in Developer Preview. Every meeting participant must be individually enrolled — if anyone isn't, audio capture fails. Calendar integration and in-meeting chat work normally for everyone. For production voice use cases, prefer Teams, Discord, Nextcloud Talk, or SIP.

How it works

Agent (Claude Desktop, Cursor, …)
  │ MCP (Streamable HTTP, Authorization: Bearer chmd_*)
  ▼
mcp.chamade.io                       (hosted by Chamade)
  │
  ▼
Chamade API                           (chamade.io)
  │
  ▼
Maquisard bridge                      (transports audio; forwards to your
                                       STT/TTS provider when BYOK preset set)
  │
  ▼
Discord / Teams / Meet / …

With Option B (stdio shim), the client doesn't speak HTTP; the shim sits in between as a transport adapter:

Agent (stdio-only client)
  │ stdio JSON-RPC
  ▼
@chamade/mcp-server@3                 (this package, ~160 LOC)
  │ spawns
  ▼
mcp-remote                            (local subprocess)
  │ Streamable HTTP, Bearer chmd_*
  ▼
mcp.chamade.io                        (hosted)

Development

npm install
npm run dev     # runs with tsx (hot reload, src/index.ts)
npm run build   # compiles to dist/
npm test        # unit tests for deriveMcpUrl + buildRemoteArgs

The shim itself is tiny (see src/index.ts). Full MCP tool behavior is tested in the parent Chamade repo under tests/e2e/test_mcp_http.py, which drives the hosted server directly — that's the source of truth for tool semantics.

Documentation

• MCP server docs — setup for every major client
• Push mode docs — how real-time push events work (stateful sessions)
• Agents — bearer × platform scoping (one agent per key / OAuth client)
• Full API reference — every tool, every endpoint, LLM-formatted
• Setup guide — step-by-step onboarding for agents

Issues & feedback

• Bug or feature request: open an issue
• Direct contact: contact@nafis.io
• In-app: every Chamade dashboard has a "Send feedback" button

License

MIT — see LICENSE.