callrail-mcp

A Model Context Protocol server that exposes the CallRail REST API v3 to any MCP-compatible client (Claude Code, Claude Desktop, Cursor, etc.).

Created by Steve Japalucci — Founder of Pittsburgh Digital Marketing Agency (PGHDMA).

What you can ask Claude to do

Once installed, any MCP-aware assistant can answer things like:

Reporting

• "Pull last week's calls for Alan Construction, grouped by source"

• "Show me every missed call from Google Ads this month"

• "Find any calls from 412-555-1234 across all clients in the last 90 days"

• "Get the transcript for call CAL019abc..."

Agency cost attribution (new in v0.4)

• "Why is my CallRail bill $174? Break it down by client"

• "Which client is the biggest minute user this cycle?"

Conversion debugging (new in v0.4)

• "Why didn't this call convert in Google Ads? CAL019..."

• "Is this 58-second call eligible to count as a Google Ads conversion?"

Tag + tracker management

• "Tag this call as 'lead' and add a note"

• "Provision a new Google Ads call-extension tracker for Renaissance in area code 412" (requires confirm_billing=True — costs ~$3/mo)

Related MCP server: Kommo CRM MCP Server

Installation

# Recommended: pipx for isolated CLI install
pipx install callrail-mcp

# Or with pip
pip install callrail-mcp

To install from source (latest unreleased):

pipx install git+https://github.com/pghdma/callrail-mcp.git

Auth

Get an API key at Settings → API Keys in your CallRail account. You need Account Admin permission to create one.

Provide it one of two ways:

Option 1: environment variable (recommended for most setups)

export CALLRAIL_API_KEY="your_key_here"

Option 2: key file

mkdir -p ~/.config/callrail
echo "your_key_here" > ~/.config/callrail/api-key.txt
chmod 600 ~/.config/callrail/api-key.txt

Or override with CALLRAIL_API_KEY_FILE=/path/to/key.txt.

Configure your MCP client

Claude Code / Claude Desktop (~/.claude.json or claude_desktop_config.json)

{
  "mcpServers": {
    "callrail": {
      "command": "callrail-mcp",
      "env": {
        "CALLRAIL_API_KEY": "your_key_here"
      }
    }
  }
}

If you installed via pipx, callrail-mcp will be on your PATH automatically. Otherwise, point command at the full path to the executable.

Cursor / other clients

The server speaks standard MCP stdio. Any client that supports stdio MCP servers will work — just run callrail-mcp as the command.

Available tools

59 tools total — ~95% of CallRail's REST API v3 surface. Read tools, write tools, tracker provisioning, agency aggregation, account management (Companies/Users CRUD), notifications, integrations discovery, outbound calls, offline-lead backfill via create_form_submission, and (new in v1.1) leads, SMS-thread lead management, server-side analytics, and per-call page views.

Read tools

Write tools (v0.2+)

Tracker provisioning (v0.3+)

Account management (v0.6+)

Notifications + Integrations (v0.7+)

Outbound calling (v0.7+)

Validation is strict: phone-number format, area code (^\d{3}$), pool_size ∈ [1, 50] (safety cap to prevent accidental 5-figure provisioning bills), name/whisper/greeting length caps, source-type enum (12 values: the 10 documented at apidocs.callrail.com plus facebook_all / bing_all which are proven in production but still absent from the docs). Tag colors validate against the full documented 24-color set.

Leads & server-side analytics (v1.1+)

Agency aggregation (v0.4+)

All tools accept account_id optionally — if omitted, the first accessible account is auto-resolved. Most accept company_id to filter to a single client.

How this compares to CallRail's official MCP server

CallRail now offers an official hosted MCP server (documented at apidocs.callrail.com) — OAuth 2.0, ~30 tools, with the server URL "provided by your CallRail account team." It's a good option if you want a fully managed remote server.

This project remains different on purpose:

Both speak the same underlying REST API v3. If you're an agency running Claude against multiple client accounts and want cost attribution and bulk workflows, this project is built for exactly that.

Out of scope (deliberately not implemented)

The following CallRail capabilities are NOT in this MCP, by design. PRs welcome if you have an account that supports them — or open an issue and we'll prioritize.

Blocked by CallRail account permissions (returns 403)

These endpoints exist but require account upgrades / additional permissions our standard CallRail account doesn't have. Verified live 2026-04-24:

• Send SMS (POST /text-messages.json) — needs A2P SMS registration / dedicated SMS API permission. CallRail enforces TCPA-compliance keywords (STOP / CANCEL / UNSUBSCRIBE) on outbound text messages.

• Webhook integration create / update / delete (POST /integrations.json with type=Webhook) — needs Integration-Admin permission. CallRail manages webhooks via the Integrations framework, not a standalone endpoint.

Not exposed by CallRail's REST API (UI-only on standard plans)

These have no API equivalent at all — managed exclusively via the CallRail web UI:

• Outbound Caller IDs — verification flow for outbound caller identification.

• Numbers — account-level number ownership, porting, transfers.

• Call Flows — IVR builder / call routing tree configuration.

• Custom Fields CRUD — custom data columns are readable as part of call/form responses but the schema management endpoint isn't exposed.

• Do Not Call list — DNC number management.

Will work on if/when

Either CallRail upgrades the API or the user upgrades their account permissions, the above can be added without breaking changes — we'd just expose them as new MCP tools.

Rich field selection

The CallRail API returns a lean default payload. Ask for more fields on list_calls / get_call / list_form_submissions via the fields parameter:

fields=company_name,source_name,keywords,landing_page_url,device,first_call,value,tags,note,gclid,fbclid,utm_source,utm_medium,utm_campaign,utm_content,utm_term,referrer_domain

See the CallRail API docs for the full field catalog per resource.

Examples

Claude Code

> List companies under our CallRail account.

(Claude calls list_companies → returns clients with IDs and primary numbers)

> Pull today's calls for company COM019ab... — include source and keyword.

(Claude calls list_calls with company_id, days=1, fields="source,keywords,landing_page_url")

> Why is my CallRail bill $174 this month? Break it down by client.

(Claude calls usage_summary → returns per-company cost share, sorted by biggest user)

> Why didn't this call show up as a conversion in Google Ads? CAL019dbf79...

(Claude calls call_eligibility_check → returns gclid/duration/answered checks
 + targeted reason like "duration 58s under Google Ads minimum (60s)")

> Provision a new Google-Ads-call-extension tracker for Alan Construction in 412.

(Claude calls create_tracker — refuses unless you also pass confirm_billing=True
 since it incurs a ~$3/mo charge)

Direct Python usage

The CallRailClient is also usable as a library:

from callrail_mcp.client import CallRailClient

cr = CallRailClient()  # picks up CALLRAIL_API_KEY
aid = cr.resolve_account_id()
for call in cr.paginate(f"a/{aid}/calls.json", {"per_page": 250}, items_key="calls"):
    print(call["id"], call.get("source"), call.get("customer_name"))

Running the server directly

For debugging or to verify your key works:

python -m callrail_mcp

The server speaks MCP stdio. It will wait for JSON-RPC messages on stdin. Ctrl-C to exit.

To smoke-test the API key without running the MCP loop:

python -c "from callrail_mcp.client import CallRailClient; c=CallRailClient(); print(c.get('a.json'))"

Rate limits

CallRail allows 60 requests/minute per API key. The client retries 429 responses using the Retry-After header, and 5xx responses with exponential backoff (max 3 retries by default). For heavy pagination, prefer the built-in paginate() helper which uses per_page=100 by default.

Development

git clone https://github.com/pghdma/callrail-mcp
cd callrail-mcp
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"
pytest

Contributing

Contributions welcome — see CONTRIBUTING.md for dev setup, test conventions, and release flow. Please file issues via GitHub Issues and follow the Code of Conduct.

Security

If you discover a security vulnerability, please report it privately per SECURITY.md instead of opening a public issue.

Author

Steve Japalucci — Founder of Pittsburgh Digital Marketing Agency. Reach out at s@pghdma.com.

License

MIT — see LICENSE. Copyright © 2026 Steve Japalucci / Pittsburgh Digital Marketing Agency.

Disclaimer

This project is an independent open-source integration and is not affiliated with, endorsed by, or officially supported by CallRail. "CallRail" is a trademark of CallRail, Inc. All product names, logos, and brands are property of their respective owners.