Atlas entry

`fathom-lab-door.fly.dev`

46 capabilities over MCP. First atlas observation.

Observed 4 Nov 2026, 22:54 UTC · passive: no tools called, no credentials sent · sha256:7a7245…6269

46 capabilities, 43 of them tools. 12 only read. 8 change records, and 1 of those deletes or cancels. 23 have no reading.

AI reading, beta. side-effects v1 on claude-haiku-5.5, calibrated on MCP (golden-3). Only readings above a measured precision count. Counts are tools, not calls: no tool was called.

AI readings summary · beta

The service lists 43 tools, and 20 have AI readings.

fathom_forget is read as deleting or cancelling records.

activities_update is read as changing records.

6 tools are read as creating records, including fathom_space_context, activities_add and fathom_propose.

Written by code from the AI readings on this page: it groups them and says nothing they do not.

What an agent can do here

AI readings, beta · Readings on 20 of 43 MCP tools. 1 reads as deleting or cancelling.

Moves money
0
No tool read this way.
Deletes or cancels records
1 tool
- fathom_forget0.88
Sends messages to people
0
No tool read this way.
Changes permissions
0
No tool read this way.
Runs code
0
No tool read this way.
Should ask a person first
0
No tool read this way.

No counted reading 23 tools No reading was counted, so any effect above is possible for them: activities_answer, activities_get_choice, activities_list_join_requests, activities_lock_choice, activities_offer_choice, activities_participation, activities_request_to_join, activities_set_details, activities_tick_choice, affiliations_declare and 13 more.

What changed

First atlas observation. Atlas history

Look first

AI reading, beta: AI adds items here; it never removes one.

fathom_forgetDeletes or cancels records · 0.88

Surfaces

5 protocols checked

ARD	Not found	No document retrieved
A2A	Not found	0 skills
MCP	Valid	2025-11-25 · 43 tools · 2 resources · 1 prompt
OpenAPI	Not detected	0 operations
WebMCP	Not detected	0 declarative form tools · experimental

Exact states and meaning

ARD
absent
Exact state: not found · No document retrieved
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
A2A
absent
Exact state: not found · 0 skills
The supported discovery location returned no matching document.
Not found does not prove the service exposes no such interface elsewhere.
Not observed / not fetched
MCP
observed
Exact state: valid · Revision 2025-11-25 · 43 tools · 2 resources · 1 prompt
A usable protocol document was retrieved and validated.
Directly observed
OpenAPI
absent
Exact state: not detected · 0 operations
No endpoint was established from the evidence and scope that InterfaceDelta inspected.
Not detected does not prove that no endpoint exists.
Not observed / not fetched
WebMCP
absent
Exact state: not detected · 0 declarative form tools · experimental
No named declarative WebMCP form tools were observed in the origin root HTML.
Script-registered tools and other pages are not observed, so this does not mean the site has no WebMCP tools.
Not observed / not fetched

46 · inventory complete

Showing 46 of 46.

Tool and inputs							◇ AI reading, beta · confidence
Read as one of the six effects 1 AI only raises attention: these rows come first.
link*◇ AIDeletes or cancels records 0.88		Deletes or cancels records 0.88					Deletes or cancels records0.88
`fathom_forget` inputs `link` (required) AI Deletes or cancels records 0.88
Read as none of the six 19 Not a clearance.
bring, concernRole, description, finding and 13 more							Creates records0.85
`activities_add` inputs `bring`, `concernRole`, `description`, `finding` and 13 more AI Creates records 0.85
activityId*, bring, concernRole, description and 10 more							Changes records0.85
`activities_update` inputs `activityId` (required), `bring`, `concernRole`, `description` and 10 more AI Changes records 0.85
query*, token							Reads only0.80
`capabilities_search` inputs `query` (required), `token` AI Reads only 0.80
spaceId*, token							Reads only0.82
`experiences_preview` inputs `spaceId` (required), `token` AI Reads only 0.82
token							Reads only0.80
`extensions_list` inputs `token` AI Reads only 0.80
closesGap, extension, fields, id and 5 more							Creates records0.85
`extensions_propose` inputs `closesGap`, `extension`, `fields`, `id` and 5 more AI Creates records 0.85
no inputs							Creates records0.80
`fathom_builder_start` AI Creates records 0.80
interest*, memory, page, question and 1 more							Reads only0.80
`fathom_find` inputs `interest` (required), `memory`, `page`, `question` and 1 more AI Reads only 0.80
tool*							Reads only0.87
`fathom_help` inputs `tool` (required) AI Reads only 0.87
interest, kind, name*, newTown and 6 more							Creates records0.80
`fathom_propose` inputs `interest` (required), `kind` (required), `name` (required), `newTown` and 6 more AI Creates records 0.80
spaceId, token							Reads only0.90
`fathom_space` inputs `spaceId` (required), `token` (required) AI Reads only 0.90
fact, source, spaceId, synthetic and 1 more							Creates records0.85
`fathom_space_context` inputs `fact` (required), `source`, `spaceId` (required), `synthetic` and 1 more AI Creates records 0.85
run, since, token							Reads only0.86
`genesis_items` inputs `run`, `since`, `token` AI Reads only 0.86
interest, limit, token, town							Reads only0.84
`knowledge_lens` inputs `interest`, `limit`, `token`, `town` AI Reads only 0.84
purpose, token, town, visibility							Creates records0.86
`spaces_create_draft` inputs `purpose` (required), `token`, `town`, `visibility` (required) AI Creates records 0.86
spaceId*, token							Reads only0.86
`spaces_get` inputs `spaceId` (required), `token` AI Reads only 0.86
token							Reads only0.91
`spaces_list_public` inputs `token` AI Reads only 0.91
class, name, token							Reads only0.80
`type_status` inputs `class`, `name`, `token` AI Reads only 0.80
token							Reads only0.88
`views_list` inputs `token` AI Reads only 0.88
No counted reading 23 No reading was counted, so any effect is possible.
activityId, answer, others, spaceId* and 1 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_answer` inputs `activityId` (required), `answer` (required), `others`, `spaceId` (required) and 1 more
activityId, spaceId, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_get_choice` inputs `activityId` (required), `spaceId` (required), `token`
activityId, spaceId, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_list_join_requests` inputs `activityId` (required), `spaceId` (required), `token`
activityId, optionId, spaceId*, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_lock_choice` inputs `activityId` (required), `optionId` (required), `spaceId` (required), `token`
activityId, extensionId, field, kind and 4 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_offer_choice` inputs `activityId` (required), `extensionId`, `field`, `kind` (required) and 4 more
activityId, spaceId, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_participation` inputs `activityId` (required), `spaceId` (required), `token`
activityId, name, spaceId	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_request_to_join` inputs `activityId` (required), `name`, `spaceId` (required)
activityId, extensionId, spaceId*, token and 2 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_set_details` inputs `activityId` (required), `extensionId` (required), `spaceId` (required), `token` and 2 more
activityId, optionIds, spaceId, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`activities_tick_choice` inputs `activityId` (required), `optionIds` (required), `spaceId` (required), `token` (required)
label, object, relation, subject* and 1 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`affiliations_declare` inputs `label`, `object` (required), `relation` (required), `subject` (required) and 1 more
manifest, spaceId, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`experiences_apply` inputs `manifest` (required), `spaceId` (required), `token`
manifest*, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`experiences_validate` inputs `manifest` (required), `token`
amends, attempted, need, token and 1 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`extensions_report_gap` inputs `amends`, `attempted` (required), `need` (required), `token` and 1 more
extensionId, token, version	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`extensions_withdraw` inputs `extensionId` (required), `token`, `version` (required)
days, keep*, level, time	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`fathom_remember` inputs `days`, `keep` (required), `level`, `time`
invite, name, yes*	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`fathom_space_join` inputs `invite` (required), `name` (required), `yes` (required)
link*	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`fathom_status` inputs `link` (required)
spaceId*, token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`invite_links_create` inputs `spaceId` (required), `token`
token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`places_verdicts` inputs `token`
token	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`platform_describe` inputs `token`
definition, differs_from, examples, identity_rule and 4 more	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`propose_type` inputs `definition`, `differs_from`, `examples`, `identity_rule` and 4 more
spaceId, token, version, viewId	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`views_checks` inputs `spaceId`, `token`, `version` (required), `viewId` (required)
token, view*	unknown	unknown	unknown	unknown	unknown	unknown	No reading
`views_propose` inputs `token`, `view` (required)
MCP resources 2 Not read by AI.
no inputs							Not read
`name not shown`
no inputs							Not read
`name not shown`
MCP prompts 1 Not read by AI.
no inputs							Not read
`build-interest-space`

Read as this effect No reading: unknown Not read as this effect◇ AI readings, beta. A zero is a count, not a clearance.

Not observed in this Passport: A2A skills, OpenAPI operations.

The atlas shows each capability by its plain identifier, inputs and declared sign-in. Publisher descriptions, paths, links and source evidence are not published here.

The comparison with the previous observation is shown only to the account that recorded it.

Atlas history

1 observation

4 Nov 2026, 22:54 UTC46 capabilities · MCP 2025-11-25 · MCP endpoint validFirst observation
Fingerprint and versions
Fingerprint
7a72459eb19d232a986d19b89fb8923c59c0638df8a19ee062ceb62c57886269
Passport schema
0.5.0, passport-semantic-v4
Consistency
MCP_PROMPTS_ADVERTISEMENT_LIST: match · MCP_RESOURCES_ADVERTISEMENT_LIST: match · MCP_TOOLS_ADVERTISEMENT_LIST: match · OPENAPI_MCP_EXPLICIT_MAPPING: not applicable

Each class compares an observation with the previous atlas observation. Runs of unchanged observations are grouped. Struck values are what the previous observation recorded; inserted values are what this one recorded.

Declared and observed

43 tools declare hints; the AI readings agree with all 20 that have a reading.

A disagreement is not a finding about the service: either side can be wrong. How we compare declarations and readings.

About this entry

dev.fly.fathom-lab-door/fathom
Listed
Official MCP Registry · first listed 3 Nov 2026 · last listed 3 Nov 2026

Passive observations of a public interface listed in the Official MCP Registry. An observation does not verify security, ownership or compliance, and InterfaceDelta assigns no scores or rankings. Methodology · Report an inaccuracy · Ask for removal

Identity and snapshot

Target key: sha256:53eeb14355d811c0cd94736552dc4785ee6b92652961321cd079655ee08b2aa3
Locator SHA-256: de614a8236036f8864bda9a79e225765039bcdf7e485d2231c8139de64f3d89a
Snapshot generated: 5 Nov 2026, 00:16 UTC

The entry is one exact observed target, not a real-world service identity, and implies no ownership. Endpoint paths are not published; the locator hash lets an operator confirm their own URL.

Capability facts

As observed from outside, at the time below

Observed: 4 Nov 2026, 22:54 UTC
Signed: 5 Nov 2026, 00:15 UTC

Protocols: MCP
Tools: 43
Declared sign-in: None declared

Effects counted AI readings, beta

Moves money: 0
Deletes or cancels records: 1
Sends messages to people: 0
Changes permissions: 0
Runs code: 0
Asks a person: 0

43 tools examined; 20 counted above a measured threshold.

Declared vs read disagreements

Declared read-only, read as writing: 0
Declared destructive, read as not writing: 0
Declared non-destructive, read as deleting: 0
Declared closed-world, read as reaching out: 0

Change since previous: First observation
Label status: Current