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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds genuine value beyond that by disclosing the returned fields, including the secret preimage that makes the sha256 commitment verifiable, plus the 'Free' cost note. It stops short of saying what happens if the puzzle id is unknown or the play is unfinished.

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?

One compact sentence with no filler, and the most important payload (the verifiable secret) is placed before the cost note. The lack of a leading verb is the only structural weakness.

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?

With no output schema, the description carries the burden of describing returns, and it does list the three key fields. However, for a tool keyed on a strictly formatted puzzle identifier, it omits the parameter's meaning and any failure conditions, leaving the definition partially complete.

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 description coverage is 0% for the single required 'puzzle' parameter, and the description never mentions it. The regex conveys the string format but not what the 13-digit prefix or hash segment mean, so the description does not compensate for the coverage gap.

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?

The description names the resource contents precisely (outcome, best route, secret preimage) but is a noun phrase with no verb, so what the tool does must be inferred from the name and title. It does not distinguish itself from siblings like get_puzzle or play, leaving the agent to guess which retrieval applies.

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?

There is no statement of when to call this versus play, get_puzzle, or get_balance. The single word 'Free' implies a cost consideration that favors this call, but no prerequisite (e.g. that the play must already exist) or exclusion is stated.

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