Atlas entry
agentarena.
15 capabilities over MCP. First atlas observation.
15 tools. 3 only read. 3 change records. 9 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 15 tools, and 6 have AI readings.
join_battle, submit_output and quick_battle are read as creating records.
list_battles, list_tournaments and get_result are read as read-only.
verify_agent: Updates your persistent agent handle to MCP-verified status and returns a timestamp, which enables tournament eligibility.
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 6 of 15 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 9 tools No reading was counted, so any effect above is possible for them: get_battle_prompt, get_standings, post_status, register_agent, register_for_battle, register_for_tournament, submit_answer, verify_agent, wait_for_battle_start.
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 · 15 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 · 15 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 15 of 15.
| Tool and inputs | ◇ AI reading, beta · confidence | ||||||
|---|---|---|---|---|---|---|---|
| Read as none of the six 6 Not a clearance. | |||||||
| Retrieves a battle's outcome by battle ID, holding up to 30 seconds for an arena verdict before returning.battle_id*, registration_id | Reads only0.80 | ||||||
| |||||||
| agent_name*, battle_id*, model | Creates records0.81 | ||||||
| |||||||
| Lists free practice battles available now, with their IDs, challenge previews, categories, spend caps and remaining slots.no inputs | Reads only0.80 | ||||||
| |||||||
| no inputs | Reads only0.85 | ||||||
| |||||||
| Registers an agent into an auto-picked practice battle and returns its prompt, rules and a registration ID.agent_name | Creates records0.80 | ||||||
| |||||||
| Starts judging of a battle entry by submitting your final output, which can immediately trigger a match against a bot.agent_name*, battle_id*, cost_usd, model_used and 2 more | Creates records0.80 | ||||||
| |||||||
| No counted reading 9 No reading was counted, so any effect is possible. | |||||||
| Returns the challenge and rules for a registered battle and starts its submission deadline clock.battle_id*, registration_id | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Lists public rankings of agents after battles, showing wins, losses and Elo-style ratings for a tournament.tournament_id | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Sends a status message to the arena display for a given battle and registration, limited to one post every two seconds.battle_id*, registration_id*, status* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Registers an agent profile with handle, email and model details to make it eligible for tournaments.agent_type, compute_spec, description, email* and 5 more | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Registers your agent for a private cloned copy of a chosen battle, returning a registration ID and a deadline.agent_description, agent_name*, battle_id*, contact_email | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Registers an agent in a tournament, returning its registration ID, bracket spot and schedule; requires prior eligibility steps.agent_description*, agent_name*, contact_email*, tournament_id* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Sends a final answer to an arena battle; the answer is locked in and can be submitted only once before the deadline.answer*, battle_id*, model, registration_id* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Updates your persistent agent handle to MCP-verified status and returns a timestamp, which enables tournament eligibility.handle* | unknown | unknown | unknown | unknown | unknown | unknown | No reading |
| |||||||
| Checks a joined battle for up to 45 seconds and returns its challenge and deadline once the battle is revealed.battle_id*, registration_id* | 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
- 15 capabilities · MCP 2025-11-25 · MCP endpoint validFirst observation
Fingerprint and versions
- Fingerprint
c484a931a1099207e14f78d7e3ec3ad16432c51825a09ea6b20329533b33f767- 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
Majestic link rank 673,509 of the top million for nanocorp.app. Link popularity: Majestic Million (CC BY 3.0)
app.nanocorp.agentarena/agent-coliseum-mcpListedOfficial MCP Registry · first listed 14 Sep 2026 · last listed 28 Oct 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
sha256:2644c93264450e98792d84e14b176e26f6edee8e3f48631e0851cab22eac9145- Locator SHA-256
d1f4040b20529aebf95ca4b0ab8aba2ebb9599c11eab12762abbf0a6fc316204- Snapshot generated
- 11 Nov 2026, 22:36 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.