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

Annotations already declare readOnly, idempotent, non-destructive, and openWorld. The description adds genuine behavioral context beyond that: it recomputes the fingerprint rather than trusting input, and returns a match/no-match verdict. It stops short of describing failure modes (bad URL, unreadable image) or the response shape.

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?

Two short sentences, zero filler, with the core purpose front-loaded and the mechanism as supporting detail. Nothing repeats the title verbatim without adding 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 two-parameter, read-only, no-output-schema tool this is nearly complete: purpose, mechanism, and the nature of the result are all stated. The only gap is not clarifying what happens on mismatch or invalid input, which an agent calling it blind might want.

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 100%, so both parameters (image URL, sha256 fingerprint) are already documented in the schema. The description restates the same mapping ('picture's fingerprint' vs 'the one in the passport') without adding format, encoding, or error semantics beyond it.

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 specific verb (check/verify) and resource (picture against an artwork passport), and the second sentence explains the mechanism (recompute fingerprint, compare to passport value). It is clear what it does, though it never names or contrasts with the obvious sibling make_artwork_passport.

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?

Usage is implied: you run this when you have an image URL and a passport fingerprint and want to confirm authenticity. There is no explicit when-to-use/when-not-to-use statement and no alternative tool named, so an agent must infer the context.

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