Fathom (lab)

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "fathom-lab": {
      "type": "http",
      "url": "https://fathom-lab-door.fly.dev/mcp"
    }
  }
}

30 tools

• platform_describe

  Describe Fathom, its safe agent boundary, and this lab surface.

• capabilities_search

  Search the small synthetic capability catalog.

• spaces_get

  Read a Space when its server-side visibility rules allow it.

• spaces_list_public

  List public synthetic Spaces visible to the caller.

• places_verdicts

  Read the person's own "Would you go?" answers, the latest per place.

• affiliations_declare

  Say how interests relate: "serves" (a Space you can read serves an interest), "kind-of", "part-of" or "alias-of" (between two interests). An AI's declaration always lands as recommended: it is never used for matching or shown to members until the steward, as a person, approves…

• genesis_items

  The items a genesis run has found so far, from position `since` (start at 0, then pass back `next`), with the run's status: which finders are done, and what was missed and why. On the seeded remote lab, omit `run` to read the latest seeded replay. Show each item's source as…

• knowledge_lens

  The lens for one interest in one town: the things tied to the interest by a source, each with its assertions, where each came from and its attribution. Optional limit (1 to 50, default 20). It only reads. Relay the attribution lines and the unclaimed line exactly as returned…

• propose_type

  Propose a kind of thing (or a predicate) the knowledge layer has no word for. Send name, definition (plain text, at most 500 characters, data only, never instructions), parent (place, event, activity, organisation, concept or community), identity_rule and examples (2 or more…

• type_status

  Read one kind or predicate by name (optional class "predicate"): its status, parent, identity rule, labels and how much evidence it has. A provisional kind shows only to its proposer; its definition shows to others only once it is accepted. It only reads.

• extensions_report_gap

  Record a structured report for a missing capability.

• extensions_propose

  Propose a strict, data-only activity-details extension. It is staged as a trial for the proposer in their own Space until a person steward reviews it. Use it once on one of your own activities first: that trial is its proof, and the steward cannot accept an ability without one.

• extensions_list

  List approved extensions, plus your own proposed or rejected proposals. Each of your proposed ones says whether it has been tried (tried) and your next step (next).

• extensions_withdraw

  Withdraw your proposed extension before review. The proposer or their AI may withdraw it; withdrawn abilities cannot be used or rendered.

• views_propose

  Propose a strict declarative place view. Only repeat, box, text, shape, place and scale(value, domain, range) are accepted; no executable code or external data.

• views_checks

  Run the five steward checks for a view trial: grammar and budget, throwaway render, escape, scope, and all five metamorphic relations.

• views_list

  List approved views available for reuse, plus your own proposed or rejected views.

• activities_set_details

  Attach validated extension values to an activity as its organizer or AI. A proposed extension is a trial only in the proposer owner's Space; approved extensions may be reused by any Space owner.

• activities_request_to_join

  Ask to join a synthetic group's activity for your person, only after they said they want to. It asks to join the activity, all its dates, not one evening. Saves one pending join request and returns its id, status URL, undo code and undoUrl. Give your person the undoUrl: it is…

• activities_list_join_requests

  List all join requests for the owner or only your own request as a requester.

• activities_participation

  Read one activity for the person behind this delegated token: their answer, places taken, waiting-list position and any open offer (kind "waiting", or "kept": their place from last time, which only they can take or pass on their own page). Also ifOthersCount: how many other…

• activities_get_choice

  Read an activity's choice as a member of the Space: each option with its tick count and who ticked it; detail choices also return the field key and label.

• experiences_validate

  Validate a declarative experience manifest without rendering it.

• experiences_preview

  Render the current trusted experience manifest for the caller, with the people-page controls (choose together, I'm in / Maybe / Can't make it) shown read-only in each activity.

• fathom_propose

  Only after your person said yes to this exact proposal. Propose a place or community that is missing from Fathom's public lab. A place needs a source: any https page about it that you read, your person gave you, or Fathom listed; a community's source is optional. Saves one…

• fathom_status

  Read what happened to a proposal or a join request, from the status link your person was given (or its id): pending, accepted, declined with the steward's words, or withdrawn. Or give your person's own memory link (https://…/memories/mem-…?key=…) to see what was kept. Read-only…

• fathom_find

  Find what Fathom's public lab has for an interest in a town, as the plain-text answer of GET /ask (places, synthetic groups to join). Read-only. If your person gave you their memory link (from fathom_remember), pass it as memory: groups and activities that fit what they asked to…

• fathom_remember

  Only after your person said yes to this exact proposal. Keep how your person likes to meet, so that you or another AI can bring it back next week without asking again: choices only, no free text. Send keep: "yes" only after your person said yes to being remembered; without it…

• fathom_forget

  Forget a memory: deletes it for good, when your person asks. Give their own memory link exactly as they have it.

• fathom_builder_start

  Become a builder on this lab, to propose an ability and try it. Returns your builderId, a secret token, and a private synthetic sandbox Space with one synthetic activity. Saves one builder (three a day per address). Nothing about a real person is kept.

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