Name: Fathom (lab)
Author: fathom-lab-door

Fathom (lab) MCP

Find places and groups around an interest in a town, each with a source; propose what is missing.

Tool-list grade A Remote · Streamable HTTP No auth needed 42 tools v0.1.0

No reviews yet by fathom-lab-door The publisher’s own endpoint — this marketplace is not in the path

93/100

tool-list score

tools declared

remote

at its publisher

—

calls last 7d

What it does

Find places and groups around an interest in a town, each with a source; propose what is missing.

Quickstart

# 1 — add it to Claude Code
claude mcp add --scope user --transport http fathom-lab-mcp https://fathom-lab-door.fly.dev/mcp

# 2 — ask your agent for something these tools do
#   platform_describe, capabilities_search, spaces_create_draft and 39 more

Fathom (lab) costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.

Publishernot claimed

fathom-lab-door1 server

1 category

All 1 server

Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.

Tool surface

What the model actually sees. Descriptions are diffed on every release — see version history.

Only tools that write or reach the network

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

Parameter	Type	Required	Notes
token	string	no	—

Search the small synthetic capability catalog.

Parameter	Type	Required	Notes
token	string	no	—
query	string	yes	—

Create a synthetic draft Space for the delegated principal.

Parameter	Type	Required	Notes
token	string	no	—
purpose	string	yes	—
visibility	string	yes	—
town	string	no	—

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

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—

List public synthetic Spaces visible to the caller.

Parameter	Type	Required	Notes
token	string	no	—

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

Parameter	Type	Required	Notes
token	string	no	—

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 it. "inferred" can never be declared. Terms are short plain text, never a person.

Parameter	Type	Required	Notes
token	string	no	—
subject	string	yes	—
relation	string	yes	—
object	string	yes	—
label	string	no	—

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 given. Relay the attribution lines and the unclaimed line exactly as returned, never reworded or dropped, and say which thing

Parameter	Type	Required	Notes
token	string	no	—
run		no	—
since		no	—

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, never reworded or dropped, and say which things are 'from a source' and which are only 'suggested'. When you pass a place o

Parameter	Type	Required	Notes
token	string	no	—
interest		no	—
town		no	—
limit		no	—

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: {name, source_url, licence, retrieved_at, existing_kind?, located_in?}); a predicate also needs class "predicate", domain a

Parameter	Type	Required	Notes
token	string	no	—
name		no	—
definition		no	—
parent		no	—
identity_rule		no	—
examples		no	—
use		no	—
differs_from		no	—

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.

Parameter	Type	Required	Notes
token	string	no	—
name		no	—
class		no	—

Record a structured report for a missing capability.

Parameter	Type	Required	Notes
token	string	no	—
need	string	yes	—
attempted		yes	—
why	string	yes	—
amends	string	no	—

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. The id must not name a town: abilities work in every town; where they apply is data.

Parameter	Type	Required	Notes
token	string	no	—
extension		no	The whole definition as one object { id, version, kind, title, purpose, fields }; or send those fields flat instead.
id	string	no	Lowercase words joined by dots or hyphens, e.g. commons.golf-round or running-distance (pattern ^[a-z0-9]+(\.[a-z0-9-]+)+$). Ids starting fathom, core or platform are reserved.
version	integer	no	1 for a new ability; a changed one is the next version.
kind	string	no	'commons' for a group's own use; 'commercial' for a business offer. Defaults to commons.
title	string	no	What it is called, at most 40 characters.
purpose	string	no	One sentence: what it helps a group know, at most 300 characters. No money, no personal data, never a condition for joining.
fields	array	no	At most 8 fields. Each has key (^[a-z][a-zA-Z0-9]{0,31}$), label and type: text (with maxLength 1-80), number or range (optional min, max), choice (options), or yesno.
closesGap	string	no	—

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).

Parameter	Type	Required	Notes
token	string	no	—

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

Parameter	Type	Required	Notes
token	string	no	—
extensionId	string	yes	—
version	number	yes	—

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.

Parameter	Type	Required	Notes
token	string	no	—
view		yes	—

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

Parameter	Type	Required	Notes
token	string	no	—
viewId	string	yes	—
version	integer	yes	—
spaceId	string	no	—

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

Parameter	Type	Required	Notes
token	string	no	—

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.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—
extensionId	string	yes	—
version	number	yes	—
values		yes	—

Add an activity to a Space as its owner. Plain text only: title up to 120 characters, when up to 80, where up to 120, description up to 500, and newcomer guidance with at most 5 bring items and 5 ground rules. No markup, links, personal data, or money words. An AI may add only synthetic activities; only a person can mark one real.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
title	string	yes	—
when	string	yes	—
where	string	yes	—
level	string	no	—
description	string	no	—
whoFor	string	no	—
bring	array	no	—
firstTime	string	no	—
finding	string	no	—
groundRules	array	no	—
concernRole	string	no	—
provenance	string	yes	—
places	integer	no	—
offerWindowMs	integer	no	—
offerWindowHours	integer	no	—

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 their own page for this request, and Withdraw is there. Keep it for them; the status URL alone can't take the request back.

Parameter	Type	Required	Notes
spaceId	string	yes	The group id, from /ask or spaces_list_public.
activityId	string	yes	The activity id, from /ask or spaces_get.
name	string	no	Optional first name or nickname; no email, phone or link.

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

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—

A person's answer to an activity (in, maybe, out, or "if-others": I'm in if 1 to 3 others are; or "withdraw" to take that back) is theirs alone, given on the people page. Called with a token, this is refused (answers-person-only) and logged: an AI may tell its person what activities_participation shows, never answer for them.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—
answer	string	yes	—
others	integer	no	—

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 members would come if others say they're in (never the person themselves, never names), and for the person's own conditional

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—

As the Space owner, let the group choose a time, place, or approved ability field; a choice field copies its options and a text field takes 2 to 4 short plain-text labels only from a person on the people page (agent text-label calls are refused). Members tick what works on the people page; you cannot tick for them. One open choice per activity.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—
kind	string	yes	—
options	array	no	—
extensionId	string	no	—
version	number	no	—
field	string	no	—

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.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—

As the Space owner, lock one option of an open choice: it becomes the activity's time, place, or detail field value and the choice closes.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—
optionId	string	yes	—

As the Space owner, change an activity: title (up to 120 characters), when (80), where (120), description (500; empty removes it), and newcomer guidance. Plain text only; empty guidance text or lists remove them. Members see "Changed". An AI may not mark an activity real.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
activityId	string	yes	—
title	string	no	—
when	string	no	—
where	string	no	—
description	string	no	—
whoFor	string	no	—
bring	array	no	—
firstTime	string	no	—
finding	string	no	—
groundRules	array	no	—
concernRole	string	no	—
provenance	string	no	—

Create a private invite link as the Space owner.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—

Validate a declarative experience manifest without rendering it.

Parameter	Type	Required	Notes
token	string	no	—
manifest		yes	—

Apply an owner-approved trusted experience manifest to a Space.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—
manifest		yes	—

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.

Parameter	Type	Required	Notes
token	string	no	—
spaceId	string	yes	—

Only after your person said yes to this exact proposal. Propose a place or community that is missing from Fathom's public lab, or (kind offer) your person's own spare capacity, for example a spare kiln shelf on Thursday evenings. 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 pending proposal and re

Parameter	Type	Required	Notes
kind	string	yes	place (a public page about it is required as the source), community, or offer: a person's own spare capacity, only with their yes
interest	string	yes	The interest it serves, for example pottery.
town	string	yes	The town it is in, for example Oslo.
name	string	yes	Its name; for an offer, what is offered, for example a spare kiln shelf.
yes	string	no	Required for an offer (kind offer), and sent only after your person said yes to this exact offer. Without it nothing is offered. Ignored for a place or community.
when	string	no	Only for an offer: optional short words on when, for example Thursday evenings. No contact details.
source	string	no	Any https page about it that you read, your person gave you, or Fathom listed; required for a place, optional for a community. Never a placeholder or invented address.
note	string	no	Optional: one line on why it fits.
said_as	string	no	Optional: the word your person used for the interest, when it differs (for example klatring); the interest is stored as the matched one.
newTown	string	no	Only when your person confirmed a real town the lab does not cover yet.

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; give the link exactly as your person has it. Nothing is saved.

Parameter	Type	Required	Notes
link	string	yes	The status link, for example https://…/proposals/prop-1 or https://…/joins/join-1, or just its id; or your person's own memory link.

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 be remembered come first, with one line saying so. Nothing is removed. A link that is not theirs changes nothing.

Parameter	Type	Required	Notes
interest	string	yes	The interest, for example pottery or klatring.
town	string	yes	The town, for example Oslo.
question	string	no	Optional: the person's question in their own words. Fathom does not classify it; the answer is the same with or without it.
memory	string	no	Optional: your person's own memory link, exactly as they have it.
page	integer	no	Optional: page of ten places, from 1.

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 nothing is kept. Returns your person's own link (the only way back to the memory): give it to them and keep it private. Cho

Parameter	Type	Required	Notes
keep	string	yes	Send yes only after your person said yes to being remembered. Without it nothing is kept.
level	string	no	Optional: beginner or experienced.
days	string	no	Optional: weekdays or weekends.
time	string	no	Optional: daytime or evenings.

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

Parameter	Type	Required	Notes
link	string	yes	Your person's own memory link, for example https://…/memories/mem-…?key=…

Join a builder's private Space for your person, through the invitation link they were given, only after your person said yes to joining. Send yes: "yes" and the name they want the others to see (a first name or nickname). Returns their own token: pass it to answer for them when they say so (activities_answer, activities_tick_choice) and to see the Space (fathom_space). One person per session.

Parameter	Type	Required	Notes
invite	string	yes	The whole invitation link (…/join/…), or its token.
yes	string	yes	Send yes only after your person said yes to joining. Without it nothing is joined.
name	string	yes	The first name or nickname your person wants the others to see. No contact details.

Add one fact about a Space you built (a place, a price, a date, a room): with the https page that states it as source, or synthetic: "yes" when it is made up for this plan (the people then see it marked "synthetic: made up for this plan, not checked"). Exactly one of the two. Builder's token only.

Parameter	Type	Required	Notes
token	string	yes	Your builder token.
spaceId	string	yes	—
fact	string	yes	One fact, plain text.
source	string	no	The https page that states the fact.
synthetic	string	no	yes when the fact is made up for this plan.

See a private Space as its members do: its purpose, what is known (each fact with its source or marked synthetic), each thing decided together with who said yes, open choices with their ticks, and who joined. Your builder token, or your person's own token from fathom_space_join.

Parameter	Type	Required	Notes
token	string	yes	A builder token, or a person's own token from fathom_space_join.
spaceId	string	yes	—

Tick every option of an activity's open choice that works for your person, when they say so, with their own token from fathom_space_join. An empty list takes their ticks back. Replaces their earlier ticks.

Parameter	Type	Required	Notes
token	string	yes	Your person's own token from fathom_space_join.
spaceId	string	yes	—
activityId	string	yes	—
optionIds	array	yes	The option ids that work for your person (from fathom_space or activities_get_choice).

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.

No parameter schema on file.

Free

$0 forever

Every tool — any call limit is its publisher’s, not ours
No card, and mcprush charges nothing for it
Runs at its publisher’s own address — this marketplace is not in the path
Nothing to cap, because mcprush bills nothing

Nothing here is billable: mcprush charges nothing to install Fathom (lab) or to call it, at any volume.

ATool-list grade · score 93 / 100

Release 0.1.0 · scanned 2 Nov 2026

Graded from the tools this server lists, not from its source code.

Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.

Threat score100

Client score93

Findings0 threat · 0 capability

Capabilitymoderate

Coveragemanifest

Verificationnot in this report

Surface digesta352ab9c490d3176615d8e5b32d4f8a0c9a264f94c4875547bf7643d76f82cc0

Score vectorthreat 100 → client 93

Term	Level	What it prices	Points
capability-exposure	moderate	capability blast radius (moderate) — client exposure if the model is manipulated	−3
coverage-honesty	manifest	inspection depth (manifest) — how much of the target the scan could see	−4

score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.

What the scan could actually read

A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.

The scan read each tool’s name, description, input schema and annotations exactly as the server listed them the last time it answered us; no code was reviewed. We ask the server again about once a month, and a list that changed is graded again.

Tool surfaceread

Implementation sourcenot available

Package metadatanot available

Live transportnot available

The implementation source was not read — this reflects the declared tool metadata only.

Capability — what it could do if the model were manipulated

Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. moderate is the level these add up to.

Tool	Capability tags	Why the tag was assigned
platform_describe	no tags
capabilities_search	no tags
spaces_create_draft	state-write	state-write: declares readOnlyHint: false
spaces_get	no tags
spaces_list_public	no tags
places_verdicts	no tags
affiliations_declare	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
genesis_items	no tags
knowledge_lens	no tags
propose_type	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
type_status	no tags
extensions_report_gap	state-write	state-write: declares readOnlyHint: false
extensions_propose	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
extensions_list	no tags
extensions_withdraw	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
views_propose	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
views_checks	state-write	state-write: declares readOnlyHint: false
views_list	no tags
activities_set_details	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
activities_add	state-write	state-write: declares readOnlyHint: false
activities_request_to_join	state-write	state-write: declares readOnlyHint: false
activities_list_join_requests	no tags
activities_answer	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
activities_participation	no tags
activities_offer_choice	state-write	state-write: declares readOnlyHint: false
activities_get_choice	no tags
activities_lock_choice	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
activities_update	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
invite_links_create	state-write	state-write: declares readOnlyHint: false
experiences_validate	no tags
experiences_apply	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
experiences_preview	no tags
fathom_propose	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
fathom_status	no tags
fathom_find	no tags
fathom_remember	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
fathom_forget	state-write	state-write: declares readOnlyHint: false, destructiveHint: true
fathom_space_join	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
fathom_space_context	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true
fathom_space	no tags
activities_tick_choice	state-write	state-write: declares readOnlyHint: false
fathom_builder_start	external-sink	external-sink: declares readOnlyHint: false, openWorldHint: true

Toxic-flow graph

The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.

The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.

Supply chain and provenance

Integrityfirst-seen

Surface digesta352ab9c490d3176

Scanned2026-11-02

This is the first scan of this surface here, so there is nothing yet to compare it against.

Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.

Where are you running it?

Tool surface

Release history

Fathom (lab) MCP

What it does

Quickstart

Where are you running it?

Tool surface

What counts against your monthly calls

What the scan could actually read

Capability — what it could do if the model were manipulated

Toxic-flow graph

Supply chain and provenance

Release history

See also