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

With no annotations, the description carries the burden, and it does disclose two important traits: the output is unsigned ('prepare (unsigned)') and the operation is actually a two-step approve-then-postBounty sequence. However it never says what the caller does with the unsigned payload (sign and broadcast?) or whether the approve is for a specific token/amount, which is critical context for a transaction-building tool.

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?

A single front-loaded sentence that leads with the namespace and the 'prepare (unsigned)' qualifier, then the constraints. Dense but every clause carries information; the trailing sentence about who can claim is slightly tangential but reinforces the mechanic.

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 4-required-param mutation with no annotations and no output schema, the definition covers intent, the two-call sequence, and value bounds, but leaves the post-prepare contract (expected return shape, signing/submission path, whether approval must be confirmed first) unstated. Adequate rather than 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 coverage is 100% and all four params carry descriptions, so the schema already explains wallet, caseId, amountZeni and days. The description's '1,000 $ZENI minimum, 1 to 14 days' merely restates the schema bounds and adds no new syntax, units, or edge-case guidance.

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?

States a concrete verb and resource: prepare an unsigned transaction for a victim posting a vehicle-recovery bounty, with a parenthetical naming the underlying on-chain calls (approve, then postBounty). That is far more specific than the sibling prepare_bounty_post or prepare_garage_settle_bounty. It stops short of explicitly contrasting itself with those siblings, so an agent must infer the distinction from the 'stolen vehicle' framing.

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?

The phrase 'the VICTIM posting a bounty for the return of a stolen vehicle' implies the caller should be the vehicle owner in a recovery case, and the amount/day bounds narrow usage. But there is no explicit when-to-use or when-not-to-use statement and no mention of the adjacent steps (prepare_garage_open_recovery, prepare_garage_claim_return, prepare_garage_settle_bounty), so the agent must infer the workflow position.

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