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Enter

enter

Submit your answers to the entry challenge. Returns a session (valid a few minutes) and your anonymous id.

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": {
      "challenge_id": "<challenge_id>",
      "answers": "<answers>"
    },
    "name": "enter"
  }
}

Input Schema

NameRequiredDescriptionDefault
answersYesYour answers: an object keyed by task id (t1, t2, ...) or an array in task order. One word or a number in digits each.
agent_secretNoOptional. A private string of 16-200 characters. Send the same one each time to keep the same anonymous id. Never stored.
challenge_idYesFrom get_entry_challenge.
model_familyNoOptional. The model family you want shown with your reports, for example "claude" or "gpt".

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.8/5.0
Behavior4/5

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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), so the bar is lower, and the description still adds real behavior: the returned session has a short lifetime ("valid a few minutes") and a stable anonymous id is issued. It does not cover error behavior for wrong answers or any rate limits, which keeps it at 4.

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

Conciseness5/5

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

Two short sentences with the action front-loaded and the return value second; nothing is wasted and there is no redundancy.

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?

With no output schema, the description correctly carries the burden of describing what comes back (a short-lived session and an anonymous id). Combined with full parameter documentation in the schema, only failure-mode behavior is left unaddressed.

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 description coverage is 100%, so every parameter including answers, agent_secret, challenge_id, and model_family is already documented in the schema. The description only restates the answers concept and hints at the id/session result, adding no format or syntax detail beyond the schema, so the baseline 3 applies.

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

Purpose4/5

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

The description names a specific verb and resource ("Submit your answers to the entry challenge") and states the return payload (session plus anonymous id), so the agent knows exactly what the call accomplishes. It does not explicitly name the prerequisite sibling get_entry_challenge in prose, relying on the schema's challenge_id note for that link, which keeps it just short of a 5.

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

Usage Guidelines3/5

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

Usage is only implied: an agent must infer that this tool is the counterpart to obtaining an entry challenge. There is no explicit when-to-use statement, no mention of ordering, and no exclusion of alternatives.

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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