Mcp Dev Calls

Speko Calls — "AI calls for devs" MCP demo

Find a business and place a real, disclosed phone call to it — straight from your coding agent.

> "call Sakura Sushi and ask if they have a table for 4 at 8pm" > → "Hi, I'm John's AI assistant…" > → OUTCOME: table for 4 at 8pm, booked under John — back in your terminal.

This repo is a demo. It shows how a developer can wire a Claude Code MCP to Speko's calling platform: get an API key from platform.speko.dev, bring your own business-lookup (Google Places), and let Speko place the call.

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What it showcases

1. Get a key, make a call. SPEKO_API_KEY from platform.speko.dev → real outbound calls via the official @spekoai/sdk.
2. Bring-your-own lookup. The Google business lookup lives in this demo's own server, not baked into api.speko.dev. Speko's API stays focused on calling; discovery is the app's concern.
3. Safety as the product. A non-removable AI disclosure, business-line checks where required, no-sell/harassment/impersonation screens, rate caps, local DNC, after-hours confirmation, and signed dial tokens — all enforced server-side, where they can't be patched around.
4. Two clean tiers. A thin, secret-free MCP (mcp-framework) over a backing API that holds the keys.

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Architecture

┌─────────────┐   MCP (stdio)    ┌──────────────────────┐   HTTP (+SPEKO_API_KEY)   ┌──────────────────┐
│ Claude Code │ ───────────────▶ │  mcp/   (no secrets) │ ────────────────────────▶ │  api.speko.dev   │
│  (you)      │  lookup/make/    │  mcp-framework tools │   via @spekoai/sdk        │  dial · poll ·   │
└─────────────┘  readiness       └──────────┬───────────┘                           │  transcript      │
                                            │ HTTP                                  └──────────────────┘
                                            ▼
                                 ┌──────────────────────────────────────────┐
                                 │  server/  (the backing API — holds keys)  │
                                 │  • Google Places business lookup          │
                                 │  • Twilio carrier line-type check         │
                                 │  • signed HMAC dial tokens                │
                                 │  • disclosure + abuse guardrails          │
                                 └──────────────────────────────────────────┘

• mcp/ — the MCP server Claude Code talks to. Built on mcp-framework. Holds no secrets; every tool just calls server/ over HTTP.
• server/ — a small Express API. Holds SPEKO_API_KEY, the Google Places / Twilio keys, and the dial-token secret. Runs the lookup, enforces every safety rail, and dials through @spekoai/sdk.

Why split it? Two reasons: secrets and rails must live somewhere trusted (you can't ship keys in an npx package), and per the demo's design the Google lookup stays out of api.speko.dev — it belongs to the app.

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Quickstart

# one command: sign in with your browser, then it writes the MCP into every coding
# agent it detects (Claude Code/Desktop, Cursor, Windsurf, VS Code, Gemini, Codex, Cline)
# and installs the calling guide in each.
npx @spekoai/mcp-calls@latest init

init signs you in via your browser, then writes your key into every coding agent it finds. Already have a key, or on a headless box? --token sk_... or --paste skips the browser, and npx @spekoai/mcp-calls login re-authenticates later. The package runs single-process — your key calls api.speko.dev directly (no separate server to boot).

Then, in your agent:

> "call Sakura Sushi and ask if they have a table for 4 at 8pm — my name is John"

Manual / CI setup (skip the wizard)

# Claude Code
claude mcp add speko-calls --scope user --env SPEKO_API_KEY=sk_... -- npx -y @spekoai/mcp-calls

// Claude Desktop — claude_desktop_config.json
{ "mcpServers": { "speko-calls": {
  "command": "npx", "args": ["-y", "@spekoai/mcp-calls"],
  "env": { "SPEKO_API_KEY": "sk_..." }
} } }

To route through a hosted/remote backing server instead of running in-process, set SPEKO_MCP_SERVER_URL (then SPEKO_API_KEY lives on that server, not in your client).

lookup_business mints a dial token → make_call places the disclosed call and streams progress while it rings → the OUTCOME: line lands back in your terminal.

> Telephony note: real calls require the Speko deployment's outbound SIP trunk / caller-ID to be > configured. If make_call returns not_connected (the AI agent starts but the phone never rings), > run check_call_readiness — the demo reports this honestly rather than faking a result.

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Tools

| Tool | What it does | | --- | --- | | lookup_business(name, location?, phone_number?) | Resolve a business → dialable candidates + a signed dial_token per callable one (the only path that can authorize make_call). Pass phone_number (E.164 — e.g. found via the agent's web search) to skip the directory lookup; still carrier-verified as a business line. | | make_call(dial_token, objective, caller_name, context?) | Place the disclosed, objective-scoped call. Waits for completion, streams progress, returns the OUTCOME line + transcript. Reports connected/answered honestly — a call the platform never actually puts on the wire (no telephony leg) comes back as not_connected, never a fake success. | | call_number(phone_number, objective, caller_name) | Disclosed PERSONAL call to a specific number (e.g. a friend) — mobiles allowed. On by default (set SPEKO_ALLOW_DIRECT_DIAL=0 to restrict to business lines). | | get_call(call_id) | Read-only: re-check an existing call's status, OUTCOME, and transcript. Never dials. | | check_call_readiness() | Read-only preflight — auth, credit balance, outbound caller-ID. Never dials. |

call_me (ring the account owner's own verified phone) ships in v2, once the platform exposes a verified personal phone — it is intentionally not registered in v1 (no inert tools in the agent's context); check_call_readiness reports its availability.

Safety rails (enforced in server/)

Built around consent and server-side enforcement: a hard-coded, non-overridable AI disclosure, business-line verification on lookup_business, no-sell/no-spam + harassment + impersonation screens, per-number rate caps, a local do-not-call list (speko dnc), an after-hours confirmation gate (08:00–21:00 destination-local; late or unknown-timezone calls need explicit human confirmation), signed account-bound dial tokens (HMAC-SHA256, 15-min TTL), and nonce-delimited prompt blocks against injection. These run server-side because an open npm package can be patched around.

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Layout

mcp-dev-calls/
├── mcp/              # the MCP server (mcp-framework, no secrets)
│   ├── src/
│   │   ├── index.ts          # MCPServer bootstrap (stdio)
│   │   ├── tools/            # LookupBusiness · MakeCall · CheckCallReadiness · CallMe
│   │   └── http/             # client to the backing server
│   └── server.json           # MCP registry metadata
├── server/           # the backing API (Express; holds keys + rails)
│   ├── src/
│   │   ├── index.ts          # HTTP bootstrap
│   │   ├── routes.ts         # POST /lookup · POST /call · GET /readiness · GET /call/:id
│   │   ├── lookup/           # Google Places + Twilio + demo fallback
│   │   ├── safety/           # dial tokens · objective screen · disclosure prompt
│   │   ├── speko/            # @spekoai/sdk wrapper (+ raw session read)
│   │   └── calls/            # make_call · readiness · get_call · connection assessment
│   └── test/                 # unit tests for the safety-critical logic
├── scripts/          # place-call.mjs (one-shot demo runner) · inspect-call.mjs (diagnostics)
├── .env.example      # both tiers
└── package.json      # npm workspaces root

Develop

npm run typecheck     # tsc --noEmit, both tiers
npm test              # vitest (server safety rails)
npm run build         # tsc → dist/, both tiers
npm run dev:server    # backing API with watch
npm run dev:mcp       # MCP over stdio with watch

MIT © SpekoAI

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: SpekoAI
• Source: SpekoAI/mcp-dev-calls
• License: MIT

Install and usage instructions live in the source repository linked above.