Fathom MCP Server
for AI Agents
Connect your AI agent to StackOne's Fathom MCP server and give it ready-to-use MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
7 Agent Actions
Create, read, update, and delete across Fathom — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Fathom MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Fathom tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Fathom call.
Tools Discovery →What is the Fathom MCP Server?
A Fathom MCP server lets AI agents read and write Fathom data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Fathom MCP server ships with pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Fathom MCP Tools
Every action from Fathom's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Meetings
- List Meetings
Retrieve a list of meetings recorded by or shared with the authenticated user. Returns recording_id needed by get_recording_transcript and get_recording_summary.
Teams
- List Teams
Retrieve a list of teams accessible to the authenticated user
Team Members
- List Team Members
Retrieve a list of members belonging to teams accessible to the authenticated user
Recording Summarys
- Get Recording Summary
Retrieve the call summary for a meeting recording by its recording_id (from list_meetings).
Recording Transcripts
- Get Recording Transcript
Retrieve the full transcript for a meeting recording by its recording_id (from list_meetings).
Webhooks
- Create Webhook
Create a single webhook for real-time meeting notifications. Each call creates a new webhook — never call more than once for the same request. At least one of include_transcript, include_crm_matches, include_summary, or include_action_items must be true.
- Delete Webhook
Delete an existing webhook by its ID. Use the webhook ID returned from create_webhook.
Fathom AI Agent Use Cases
Connect your AI agent to Fathom and help your team scale the sales operations they run by hand today.
Use StackOne to connect your AI agent to your CRM, email, and calendar tools to automate post-demo follow-up.
ViewUse StackOne to connect your AI agent to your CRM, email, and calendar tools to automate deal risk scoring and pipeline alerts.
ViewUse StackOne to connect your AI agent to your CRM, sales engagement, and messaging tools to automate outbound prospecting.
ViewSet Up Your Fathom MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Fathom in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Platform Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What 200+ Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.
14 min read
Fathom MCP Server FAQ
Does StackOne have a Fathom MCP server?
Fathom MCP server vs direct API integration — what's the difference?
How does Fathom authentication work for AI agents?
origin_owner_id.Are Fathom MCP tools vulnerable to prompt injection?
What is the context bloat of a Fathom agent and how do I avoid it?
Can I limit which actions my Fathom agent can access?
Can I create custom agent actions for my Fathom MCP server?
When should I NOT use a Fathom MCP server?
What AI frameworks and AI clients does the StackOne Fathom MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.