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

With no annotations, the description carries the full burden and does real work: it names both token sources, discloses the write/mutation nature of submission, and calls out the rate limit (five attempts a day). It does not say whether an accepted submission is final/reversible, what happens on rejection, or what the call returns.

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

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

Four compact sentences, front-loaded with the action and the token prerequisite before the rate limit and answer formats. No filler text; every clause conveys decision-relevant information.

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

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

For a mutation tool with no annotations, no output schema, and an opaque nested object parameter, the description supplies the auth path, the rate limit, and the three answer formats — enough to call it correctly. The remaining gap is outcome/response behavior on success or rejection, which matters more here since no output schema exists to cover it.

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

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

Schema coverage is 0% with a nested `answer` object, so the description must compensate, and it does: it enumerates the three concrete answer shapes ({ items: [..] } for Loot, { order: [..] } for Courier, { top, balance, rejected } for Ledger) and pinpoints where `token` comes from. It does not say how the agent determines which of the three shapes applies, and the inner arrays are left as [..].

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

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

Specific verb+resource ('Submit an answer to today's Trial') that is clearly distinct from siblings trial_today and trial_board, which surface rather than submit the trial. An agent can pick this tool without opening any schema.

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

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

States the prerequisite explicitly (a token from `join` for guests or from `wallet_login`), which routes the agent through the correct auth sibling first, and discloses the five-attempts-per-day limit. It does not explicitly contrast with trial_today/trial_board or say what to do when attempts run out, so it stops short of a 5.

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