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

With no annotations, the description carries the full behavioral burden. It discloses two useful traits – the result is 'precomputed' and 'signed', and there is a cost model ('$0.01 x402 or pass') – but says nothing about what happens with an unknown fingerprint, whether the fee is charged on failure, authentication beyond payment, or what the signed payload contains.

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?

It is a single short sentence with no padding, which is good, but the brevity comes at the cost of clarity rather than being front-loaded and informative. The jargon ('x402', 'pass') is unexplained.

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 two-parameter tool with zero annotation coverage, no output schema, and no parameter descriptions, the definition should explain the verdict concept, the payment mechanism, and expected behavior. It touches on cost and signing but leaves an agent unable to call it confidently.

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%, so the description must explain both parameters. It only alludes to 'fingerprint' as the lookup key and vaguely gestures at 'payment' ('$0.01 x402 or pass'), without defining the fingerprint format, what a 'pass' is, or how the payment string is constructed.

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 is a noun phrase ('Precomputed signed per-class verdict by candidate fingerprint') rather than a clear action, leaving it ambiguous whether the tool retrieves or computes a verdict. It shares the word 'rewrite' with every sibling (rewrite_family, rewrite_pack, rewrite_verify_pack) but gives no basis for telling them apart.

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 use this tool, when not to, or how it relates to rewrite_family, rewrite_pack, or rewrite_verify_pack. The only situational hint is a price, which does not guide tool selection.

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