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Hail

io.github.hail-hq/hail-mcp · v0.1.1

Measured by MCP Station

Description written by the publisher, not verified

Phone, SMS and email for AI agents. One remote MCP endpoint, OAuth login, zero install.

Connect

claude mcp add --transport http hail-mcp https://mcp.hail.so

{
  "mcpServers": {
    "hail-mcp": {
      "url": "https://mcp.hail.so"
    }
  }
}

Tools as reported by the server

• place_call
  Originate an outbound phone call. Provide ``system_prompt`` (mode A — Hail's bundled fallback LLM uses this prompt) or ``llm`` (mode B — bring your own OpenAI-compatible endpoint as ``{"base_url": ..., "api_key": ..., "model": ...}``), or both, or ``agent_id`` (a saved agent from ``list_agents`` sup
• send_email
  Send an outbound email through your configured SES sender. ``to`` is a non-empty list of RFC-style email addresses. At least one of ``body_text`` / ``body_html`` is required (both is fine — multipart-alternative). Prefer including ``body_html``: open and click tracking only works for emails with an
• upload_email_attachment
  Upload a file to attach to a future outbound email. ``content_base64`` is the file's raw bytes, base64-encoded. Returns ``{"id": ..., "filename": ..., "content_type": ..., "size_bytes": ...}`` — pass ``id`` in ``send_email``'s ``attachment_ids`` list. The id is reusable across many sends and expires
• get_call
  Fetch the current state of one call by id. Use this after ``place_call`` (or to check on any prior call) to read the call's latest ``status`` and timing fields. Returns the API's ``CallResponse`` as a dict, or ``{"error": "call not found"}`` for an unknown id.
• list_calls
  List recent calls in your organization, newest first. Cursor-paginated: pass the previous response's ``next_cursor`` to fetch the next page. ``status`` (one of queued, dialing, ringing, in_progress, completed, failed, busy, no_answer, canceled) and ``to`` (E.164) are optional server-side filters. Re
• send_sms
  Send an outbound SMS. ``to`` must be E.164 (e.g. ``+14155551234``). ``body`` is the message text. With no ``from_``: destinations where the sender-ID carrier delivers a dynamic alphanumeric sender ID unchanged (about 110 countries, see core/hailhq/core/sender_id_corridors.py) use your organization's
• get_sms
  Fetch the current state of one SMS by id. Use this after ``send_sms`` to check delivery status. Example: get_sms(sms_id="...")
• list_sms
  Page through recent SMS messages for your organization. ``status`` filters to one of: queued, sent, delivered, failed, undelivered, received. ``to`` filters to messages sent to a specific E.164 number. Paginate with the returned ``next_cursor``.
• get_email
  Fetch the full record of one email by id. Returns the complete row — including ``body_text`` / ``body_html`` and (for inbound mail) the ``in_reply_to`` / ``message_id`` headers and ``spam``/``virus``/``spf``/``dkim``/``dmarc`` verdicts. Use this after ``list_emails`` to read a received reply's body.
• list_emails
  List emails in your organization, newest first. Cursor-paginated: pass the previous response's ``next_cursor`` to fetch the next page. Two optional server-side filters: * ``direction`` — ``outbound`` or ``inbound``. Pass ``direction="inbound"`` to read replies and other received mail. * ``status`` —
• get_email_raw
  Get a fetchable URL for an email's original MIME source. Returns ``{"url": "<presigned-s3-url>"}`` — a short-lived (~5 minute) link to the full raw RFC822 message. Fetch the URL directly to read the complete original; it needs no auth header. Raw source exists for **inbound** mail only — outbound id
• get_email_attachment
  Get a fetchable URL for one inbound email attachment. ``attachment_id`` comes from an item in ``get_email``'s ``attachments`` list. Returns ``{"url": "<presigned-s3-url>"}`` — a short-lived (~5 minute) link to the attachment bytes, fetchable directly with no auth header. Unknown ids return ``{"error
• get_email_events
  Delivery/engagement timeline (sent→delivered→opened…) for one email. Chronological lifecycle events for a single email — use this to see exactly what happened to one message (bounced? opened? clicked?) rather than the account-wide aggregates ``get_email_stats`` returns. Returns ``{"items": [...], "n
• get_email_stats
  Account-level email deliverability stats (counts, rates, time series). Aggregates across your whole organization's outbound mail over a window — use this for "how's deliverability doing" rather than one message's history (``get_email_events`` covers that). ``from_`` / ``to`` are ISO 8601 timestamps
• get_events
  Page through events from across the org or one resource. Pass ``id="<type>:<uuid>"`` to narrow to a single resource — supported types are ``call``, ``email``, and ``sms`` (e.g. ``id="sms:<uuid>"`` after ``send_sms``). When narrowed to a call, the response includes a ``call_status`` field reflecting
• list_agents
  List the workspace's saved agents: the brains that answer calls and texts on its numbers, and that ``place_call`` can use via ``agent_id``. Returns ``{"items": [{"id", "name", "system_prompt", "first_message", "ai_disclosure", "ai_disclosure_line", "voice_config", "tools", "max_duration_seconds", "h
• create_agent
  Save an agent. Then call ``route_number`` so a number answers with it, or pass its id as ``agent_id`` to ``place_call``. ``system_prompt`` is what the agent follows. ``first_message`` is spoken after the AI line; omit it to let the caller speak first. ``ai_disclosure_line`` replaces the workspace AI
• route_number
  Choose which agent answers a number's calls and texts. ``voice_agent_id`` makes the number answer calls with that agent (Hail registers it for inbound at the carrier and LiveKit); ``clear_voice=True`` stops answering calls. ``sms_agent_id`` makes the agent reply to texts; ``clear_sms=True`` stops th
• quote_numbers
  Compare live phone-number offers from the carriers. Read-only: it buys nothing and charges nothing. ``country_code`` is an ISO alpha-2 code such as ``"US"``. ``capabilities`` is ``["voice"]``, ``["sms"]`` or both (default). ``number_type`` is ``local``, ``mobile``, ``national`` or ``toll_free``; omi
• acquire_number write/delete
  Buys a real phone number. It charges the setup fee and the first month now and renews monthly. Call quote_numbers first. Pass the offer's quote_id, country_code, number_type, and confirm_total_cents = monthly_cents + setup_cents from that offer. If the quote expired or the price changed (409) you ge
• list_numbers
  List the workspace's dedicated phone numbers, newest first. ``limit`` is 1..200 (default 50). Pass the returned ``next_cursor`` as ``cursor`` for the next page. Returns ``{"items": [{"id", "e164", "country_code", "number_type", "capabilities", "provisioning_state", "voice_agent_id", "sms_agent_id",
• list_number_regions
  List the US state and Canadian province codes that quote_numbers accepts as ``region`` (optional, with ``city``). Returns ``{"regions": [{"country_code", "code", "name"}]}``, such as ``{"country_code": "US", "code": "AZ", "name": "Arizona"}``, or ``{"error": "<message>"}``.
• get_number
  Fetch one dedicated number by id: its state, capabilities and which agents answer its calls and texts. ``number_id`` comes from ``list_numbers``. Returns the ``PhoneNumberResponse`` as a dict, or ``{"error": "<message>"}``.
• release_number write/delete
  Release a phone number. DESTRUCTIVE and permanent. Calls and texts to the number stop. This month's fee and any earlier months are still billed. There is no refund. The number may not be recoverable. Ask the user before calling this. ``confirm_e164`` must equal the number's ``e164`` (for example ``"
• get_verification_requirements
  Read what the carrier needs to verify the organization before it can buy a number. Call this when quote_numbers shows an offer with ``readiness == "verification_required"``. Read-only. ``country_code`` is ISO alpha-2 (for example ``"GB"``). ``number_type`` is ``local``, ``mobile``, ``national`` or `
• submit_verification write/delete
  Send the user's personal or company details and identity documents to the carrier for verification. IRREVERSIBLE: once submitted it cannot be cancelled, and the carrier keeps the documents. ``attest_authorized``: pass true only if the person or company named in these details and documents asked for
• list_verifications
  List the organization's carrier verifications, newest first. ``purpose`` is ``number`` or ``sms``; only that kind is listed. Omit to see every registration. ``purpose='sms'`` lists the registrations to text US numbers from a US number. Returns ``{"items": [{"id", "country_code", "number_type", "subj
• get_verification
  Fetch one verification and its state. Use it to poll. There is no notification, and review takes business days. Poll every few minutes to hours, not every few seconds; the state refreshes from the carrier at most once a minute. On ``approved``: call quote_numbers again. The offer is now ``ready``; t
• cancel_verification write/delete
  Cancel a verification that has not been sent for review, or dismiss a rejected one (needed before submitting a new one for the same country and number type). The draft is discarded. Works in state ``awaiting_review`` or ``rejected``, and for an ``approved`` US SMS registration (``purpose: "sms"``):
• confirm_verification
  When a registration shows confirmation 'code', ask the person for the code the carrier texted and submit it here. ``verification_id`` comes from submit_verification or list_verifications. ``code`` is 4 to 10 characters. A wrong or expired code is an error naming ``code``; the carrier sends a new one
• get_agent
  Fetch one saved agent by id. ``agent_id`` comes from ``list_agents`` or ``create_agent``. Returns the ``AgentResponse`` as a dict (``name``, ``system_prompt``, ``first_message``, ``ai_disclosure``, ``voice_config``, ``tools``, ``voice_enabled``, ``sms_enabled``, ``status``, ...), or ``{"error": "<me
• update_agent
  Change a saved agent. Safe to repeat: the same call gives the same result. Only the fields you pass change; a field left out keeps its value. ``status`` is ``"live"`` or ``"paused"``; a paused agent does not answer. ``language`` is a lowercase ISO 639-1 code. Pass ``language`` or ``voice_id`` alone:
• delete_agent write/delete
  Delete a saved agent. DESTRUCTIVE. Ask the user before calling this. Numbers that used the agent stop answering with it: calls ring out and texts reach webhooks only. Reroute them first with ``route_number`` if that matters. ``confirm_name`` must equal the agent's ``name``. The tool reads the agent
• list_contacts
  List the workspace's contacts: org members (with their phone/email) plus manually saved contacts. Use ``lookup_contact`` for name searches. ``q`` optionally filters server-side (matches name/email/phone). ``limit`` caps the page (server default 100, max 500). Returns ``{"items": [{"id", "kind", "nam
• lookup_contact
  Find a contact by name, email, or phone fragment. Resolve a person to their ``phone_e164``/``email`` BEFORE calling ``place_call``, ``send_sms``, or ``send_email`` — do not guess a contact's number. Returns up to 10 matches, same item shape as ``list_contacts``. Example: lookup_contact(query="maya")
• list_email_domains
  List the addresses this workspace can send email from. Call this BEFORE ``send_email`` when you do not already know the ``from_`` address — do not guess a domain. Returns ``{"items": [...], "next_cursor": ..., "default_from": ...}``. Each item carries ``domain``, ``kind`` (``"custom"`` or ``"hail_ma
• whoami
  Identify the human whose credentials this session runs under. Use it to sign or route mail as that person: pass their address as ``send_email(reply_to=...)`` so replies reach them rather than the sending domain, which is often an unattended ``noreply@``. Returns ``{"auth_kind", "organization_id", "u
• create_contact
  Save a new contact for the workspace. Provide at least one of ``phone_e164`` (E.164, e.g. ``+14155551234``) or ``email`` — the API rejects (422) a contact with neither. A duplicate phone or email on an existing contact returns 409. Example: create_contact(name="Maya Chen", phone_e164="+14155551234")

Tool changes

• 2026-10-24: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-23: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-22: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-20: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-19: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-18: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment
• 2026-10-16: place_call, send_email, upload_email_attachment, get_call, list_calls, send_sms, get_sms, list_sms, get_email, list_emails, get_email_raw, get_email_attachment

Repository · Website · JSON · Text for agents · Registry updated 2026-10-18