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Connect Fathom to Codex

Give Codex governed access to Fathom’s 12 tools through Runlayer, with identity, policy, scanning, and audit on every call.

Book a demo Codex setup guide

Set up

Add Fathom to Codex in four steps

Admins approve the server once. Everyone in Codex then gets it through the same governed connection.

  1. 1

    Add Fathom to Runlayer

    Fathom isn’t in the Runlayer catalog yet, so an admin adds it by its MCP server URL.

    Adding a connector manually
  2. 2

    Connect Codex to Runlayer

    Runlayer’s CLI adds the Runlayer Plugin to Codex’s local plugin marketplace, and users then enable it in Codex. With direct tool listing turned on for your deployment, Fathom’s 12 tools show up in Codex’s own tool list (Codex 0.122 or newer, installed through the Runlayer CLI).

    Codex setup guide
  3. 3

    Sign in to Fathom

    Sign in the way Fathom requires. Runlayer holds the credentials so they stay out of the client’s configuration.

  4. 4

    Use Fathom from Codex

    Fathom’s approved tools appear in Codex. Every call is checked against policy and recorded.

Tools

12 Fathom tools in Codex

Runlayer policy decides which of these Codex users can call.

  • Find person

    Find a person by name across meeting speakers, then return contact info and compact summaries for matched meetings.

  • Find relevant meetings

    Targeted ranked retrieval for specific facts, decisions, quotes, named projects, companies, products, people-plus-topic questions, or locating the best matching meetings.

  • Get identity

    Returns the authenticated user's name and email address.

  • Get meeting summary

    Returns the AI summary of a specific Fathom meeting.

  • Get meeting transcript

    Returns the full transcript of a specific Fathom meeting.

  • Get recording by call ID

    Resolve a Fathom call ID to a recording_id plus title, date, and url.

  • Get recording by URL

    Resolve a Fathom URL to a recording_id plus title, date, and url.

  • Get relevant meetings result

    Returns the find_relevant_meetings result for a search_id.

See all 12 Fathom tools

Control

What Runlayer can see and stop in Codex

Some controls apply to every client at the gateway. Others depend on what Codex exposes to Runlayer.

  • Gateway policy (available)

    Every Fathom call from Codex passes through Runlayer, where your policies can allow, alert, mask, or block it.

  • Audit trail (available)

    Each call is recorded with the user, Codex as the client, the tool, and the policy and scanner decisions.

  • Client hooks (available)

    Capture supported prompts, reasoning, local and MCP tool calls, responses, and scanner decisions in real time.

  • Stop a call before it runs (available)

    Runlayer can deny a tool call or permission request before Codex runs it.

  • Block output after it runs (available)

    Runlayer can block a tool’s output before Codex’s model sees it.

  • Redact output in place (not available)

    Codex cannot take masked output, so Runlayer can block a tool’s output but not mask it. The gateway still applies policy to the call.

Frequently asked questions

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