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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorld, so safety is covered. The description adds real context beyond them: that verification is performed on-chain against the digest committed at mint, and that it returns a self-contained answer in a single call.

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?

Very short and front-loaded: the keystone framing and the call-and-return contract arrive immediately, followed by the return shape. 'One call, a trustable answer' has slight promotional flavor but conveys the no-follow-up guarantee.

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 does substantive work by naming the returned fields (canonical_ok, artist, digest, traits) and explaining what canonical_ok means. Field types and the traits structure remain undefined, but the trust semantics are conveyed well enough to call correctly.

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?

One required parameter with 100% schema description coverage ('token id to verify'), so the schema already carries the semantics. The description adds nothing about the id itself, which is the baseline-3 case when schema coverage is high.

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 and resource: calls the contract's on-chain verify(id) and returns a trust verdict. Clear enough to distinguish from a generic verify, but it never explicitly contrasts with the sibling nonce_verify, leaving the agent to infer which verify 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?

'THE KEYSTONE... One call, a trustable answer' implies this is the go-to verification entry point, but there is no explicit when-to-use or when-not-to-use guidance and no named alternative such as nonce_verify or koine_provenance.

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