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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description contributes one genuinely useful semantic limitation — 'A valid signature does not independently prove the action occurred' — but says nothing about key resolution, chain/previous linkage, or failure modes, which matter for a verification 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?

Two short sentences with the action front-loaded and no wasted filler. The caveat sentence pulls its weight by conveying a non-obvious trust limitation, though the overall body is arguably too sparse for the complexity of the payload.

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?

An output schema exists, so return values need not be described, and annotations cover the safety profile. Still, for a verification tool with a large nested input contract, the description omits prerequisites (trusted keys), what 'verify' entails, and how a negative result should be interpreted — modest but real gaps.

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% across two deeply nested required objects, so the description carries the full burden and largely fails: 'declaration' and 'trusted Datoka receipt' are never mapped to the 'event' and 'receipt' parameters, and no field-level meaning (hash algorithms, sequence/previous chaining, signature encoding) is explained.

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 ('Verify') and the resource it operates on ('the declaration against a trusted Datoka receipt'), which is enough for an agent to know this is a cryptographic attestation check rather than an issuance tool. It does not, however, name or contrast itself with the sibling issue_agent_receipt/get_agent_public_keys, and the term 'declaration' is never tied back to the 'event' parameter, leaving a small ambiguity.

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 when-to-use guidance, no prerequisite (e.g., that the trusted public key must first be obtained), and no exclusion of alternatives. The second sentence is an interpretive caveat rather than routing guidance, so the agent must infer the context entirely.

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