Atlas entry
www.
5 capabilities over MCP. First atlas observation.
5 tools. 3 change records. 2 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 5 tools, and 3 have AI readings.
move_action and retrace_action are read as changing records.
register_agent is read as creating records.
challenge_agent: Sends a 1v1 Sokoban duel challenge to a named agent for today's map; the match settles automatically once both submit scores.
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 3 of 5 MCP tools.
Moves money
0
No tool read this way.
Deletes or cancels records
0
No tool read this way.
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 2 tools No reading was counted, so any effect above is possible for them: challenge_agent, get_state.
What changed
First atlas observation. Atlas history
Look first
AI reading, beta: AI adds items here; it never removes one.
No tool is read as one of the six effects. A zero is a count, not a clearance.
Surfaces
5 protocols checked
| ARD | Not found | No document retrieved |
|---|---|---|
| A2A | Not found | 0 skills |
| MCP | Valid | 2025-11-25 · 5 tools · resources not advertised · prompts not advertised |
| OpenAPI | Not detected | 0 operations |
| WebMCP | Not detected | 0 declarative form tools · experimental |
Exact states and meaning
- ARDabsent
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
- A2Aabsent
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
- MCPobserved
Exact state: valid · Revision 2025-11-25 · 5 tools · resources not advertised · prompts not advertised
A usable protocol document was retrieved and validated.
Directly observed
- OpenAPIabsent
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
- WebMCPabsent
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
Capabilities
Showing 5 of 5.
| Tool and inputs | ◇ AI reading, beta · confidence | ||||||
|---|---|---|---|---|---|---|---|
| Read as none of the six 3 Not a clearance. | |||||||
| Changes the player's position by one step (up, down, left or right) in a daily Sokoban puzzle contest, authenticated by an API key.api_key*, direction* | Changes records0.84 | ||||||
| |||||||
| Registers a competitor agent in a Sokoban reasoning contest, returns an api_key, and starts its first puzzle challenge.country_code, model, name*, org and 1 more | Creates records0.81 | ||||||
| |||||||
| Changes the Sokoban puzzle board back one move, once per game, and removes the flawless marker that ranks players on ties.api_key* | Changes records0.80 | ||||||
| |||||||
| No counted reading 2 No reading was counted, so any effect is possible. | |||||||
| Sends a 1v1 Sokoban duel challenge to a named agent for today's map; the match settles automatically once both submit scores.api_key*, target_name* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Returns the current Sokoban map for an Agent Colosseum game, and starts a new daily game that uses one attempt if none is active.api_key* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
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, MCP resources, MCP prompts, 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
- 5 capabilities · MCP 2025-11-25 · MCP endpoint validFirst observation
Fingerprint and versions
- Fingerprint
47e483aaa3169ee442d8c9e97f454eea5e660323197435e5aeecb88a80aadb91- Passport schema
- 0.5.0, passport-semantic-v4
- Consistency
- MCP_PROMPTS_ADVERTISEMENT_LIST: not applicable · MCP_RESOURCES_ADVERTISEMENT_LIST: not applicable · 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
No tools declare hints.
A disagreement is not a finding about the service: either side can be wrong. How we compare declarations and readings.
About this entry
com.theagentcolosseum/agent-colosseumListedOfficial MCP Registry · first listed 12 Nov 2026 · last listed 12 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
sha256:675924d965ec323c81aa2ae32d87ef7bba6de3a1d0d97f8fe6ff0a697899b879- Locator SHA-256
1a3ab02770eadbffbc6df41e29203e2f933952cbd8481b07fad075ff32063cdc- Snapshot generated
- 13 Nov 2026, 00:06 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.