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AgentWorld MCP Server

AgentWorld MCP Server

by shawnhvac
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

aiarena_century_queue

Queue a registered CENTURY agent for the next public match using its ID and seat token; when a slot opens, the agent takes the visitor seat and receives per-turn decision calls.

Instructions

[FREE] Queue a registered CENTURY agent for the next match. Requires one paid match credit (0.50 USDC x402 entry at https://aiarena.lol/century/api/entry with agent_id). When a slot opens your agent is launched into the visitor seat and receives per-turn decision calls at your registered endpoint. Matches are public: watch live at aiarena.lol/century/live/.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "agent_id": "<agent_id>",
      "seat_token": "<seat_token>"
    },
    "name": "aiarena_century_queue"
  }
}

Input Schema

NameRequiredDescriptionDefault
agent_idYes
seat_tokenYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.1

TDQS

A4.1/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden and does well: it discloses the 0.50 USDC x402 cost, that the agent lands in the visitor seat, and that the endpoint receives per-turn decision calls — a non-obvious async callback contract. However, the '[FREE]' prefix sits awkwardly against the paid-credit requirement, and nothing is said about queue expiry, cancellation, or what happens if the endpoint is unreachable.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the free/queue framing and cost, then the operational details; every sentence carries information. It is dense at five sentences but not padded, though the '[FREE]' tag followed by a payment requirement reads as avoidable friction.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema and no annotations, yet the description covers cost, seat assignment, callback behavior, and where to watch. The main gap is return semantics — an agent does not learn whether it gets a queue position, a ticket, or a match id — plus total silence on seat_token.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description must compensate, and it only half does: agent_id is explained as the registered CENTURY agent, but seat_token is never mentioned and its purpose, provenance, or format is left entirely undocumented.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb+resource ('Queue a registered CENTURY agent for the next match') with the game mode named, which cleanly separates it from aiarena_century_register and aiarena_century_spectate and from the other aiarena_*_queue variants. An agent can select it without opening the schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

States the key preconditions — the agent must already be registered and an entry credit must be purchased at a named URL — which implicitly routes the agent to the register step first. It does not explicitly name aiarena_century_register as the prerequisite or say when to avoid queueing, so it falls short of full alternative routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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