DialMCP Connector

Give your AI agent a phone.
Open-source connector for DialMCP — the hosted MCP server that lets AI agents place real phone calls from your own verified number.

What this is

DialMCP is a remote MCP server at https://mcp.dialmcp.com/mcp. Any client that speaks Streamable HTTP with OAuth can connect to it directly — no install, no API keys. You do not need this package for those clients.

This repository exists for two reasons:

1. A stdio bridge for clients that only support local servers. Some MCP clients still can't talk to remote servers. dialmcp-connector launches a local stdio server that proxies to the hosted endpoint and handles the OAuth browser flow for you.
2. The open, canonical documentation of the DialMCP integration — tool schemas, client configs, the server.json registry manifest, and the safety model — in one auditable place.

The hosted calling service itself is closed-source. This connector is MIT-licensed and contains no proprietary logic: it is a thin transport shim over a public endpoint.

Quick start

Direct connection (preferred)

If your client supports remote MCP servers, skip this package entirely:

URL:        https://mcp.dialmcp.com/mcp
Transport:  Streamable HTTP
Auth:       OAuth 2.1 (sign in with your phone number)

claude mcp add --transport http dialmcp https://mcp.dialmcp.com/mcp
# add --scope user to enable it in every project

[mcp_servers.dialmcp]
url = "https://mcp.dialmcp.com/mcp"

On first connect a browser window opens for sign-in. Verify your phone number with an SMS code — that number becomes your caller ID.

Via this connector (stdio-only clients)

npx dialmcp-connector

Or in an MCP client config:

{
  "mcpServers": {
    "dialmcp": {
      "command": "npx",
      "args": ["-y", "dialmcp-connector"]
    }
  }
}

See examples/ for ready-to-paste configs.

Tools

The API is async by design: place_call returns instantly with a call ID and your agent polls get_call, so a multi-minute call never trips a client's tool timeout.

When a call completes, get_call returns a structured resolution — achieved, partially_achieved, or not_achieved — with a summary, any commitments the other party made, suggested follow-ups, a turn-by-turn transcript, and a signed link to the audio recording.

During the call the service presses keys through automated phone trees, waits silently through hold music, and detects voicemail — hanging up rather than leaving a message.

Safety model

Every protection is enforced server-side, not as model instructions the agent could talk itself out of.

• Disclosure. Every call opens by stating it's an AI assistant, who it's calling for, and that the line is recorded — before the ask. Compliance is independently verified against each transcript and logged. The agent never denies being an AI, and ends the call if the callee objects.
• Your real number. Calls present your own SMS-verified caller ID. Nothing is spoofed, and recipients can call you back.
• Rate limits. 1 concurrent call · 3/hour · 10/day · max 2/day to the same destination · 6-minute default and 10-minute hard cap, watchdog-enforced. Bulk calling is impossible by construction.
• Time and place. 8:00–21:00 destination local time (TCPA-aligned), US and Canada only. Unknown time zones are treated conservatively.
• Non-bypassable blocklist. Emergency services (911), premium-rate lines (900/976), and high-fraud ranges can never be dialed.
• Permanent opt-outs. Do-not-call requests are confirmed on the call, caught by a second independent transcript review, stored permanently, and enforced platform-wide across every user. Public self-serve opt-out at https://mcp.dialmcp.com/opt-out — no account needed.
• Objective screening. An independent reviewer screens each call's stated objective for harassment, deception, or fraud before dialing. The agent states only facts supplied in the task.
• Prohibited uses. Telemarketing, cold outreach, robocalling, surveys, lead generation, debt collection, and political outreach are barred by the Terms.

Full detail: https://dialmcp.com/safety.html

Requirements

• Node.js 18 or newer (only if you use the stdio bridge)
• A US or Canadian mobile number for SMS verification
• Users must be 18 or older

Links

• Website — https://dialmcp.com
• Safety and anti-spam — https://dialmcp.com/safety.html
• Privacy — https://dialmcp.com/privacy
• Terms — https://dialmcp.com/terms
• Do-not-call opt-out — https://mcp.dialmcp.com/opt-out
• Support — support@dialmcp.com

Releasing

Every release publishes to two places: npm (dialmcp-connector) and the official MCP Registry (com.dialmcp/dialmcp). Both are automated by .github/workflows/release.yml.

Cutting a release

1. Bump version in both package.json and server.json — npm run validate:manifest fails if they disagree, and CI runs it on every push.
2. Merge to main.
3. Run the Release workflow manually (Actions → Release → Run workflow, dry_run left checked) and let it go green. This packs the tarball and validates server.json against the live registry schema without publishing anything.
4. Publish a GitHub Release tagged vX.Y.Z. The tag must match package.json or the workflow stops before publishing.

Step 3 is worth the two minutes: registry versions are immutable and cannot be unpublished. A bad version can only be superseded by a higher one or marked deprecated.

What the workflow does

--provenance attaches a signed attestation linking the tarball back to the commit and workflow run that built it, which is why the job needs id-token: write.

The registry publish is a separate job for two reasons. It has to wait for npm: the registry proves ownership by fetching the freshly published version and reading its mcpName field, which 404s until npm propagates (the job retries for ~2.5 minutes). And it holds the signing key, which is scoped to the whole com.dialmcp namespace rather than this one package — so it lives in a protected environment. Keeping that environment off the publish job is deliberate: its branch policy only admits v* tags, and applying it job-wide would block manual dry runs from main outright.

One-time setup

The TXT record goes on the bare domain, SPF-style — a _mcp. selector is not read and fails with an opaque signature error. Signatures carry a ±15s timestamp window, so the runner's clock must be accurate.

Contributing

Issues and pull requests are welcome for the connector, docs, and client configs. Bugs in the hosted service itself are best sent to support@dialmcp.com. Please read SECURITY.md before reporting anything security-related.

License

MIT © Datawizz Inc. See LICENSE.