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

Annotations already declare readOnly, idempotent, closed-world, non-destructive, so the safety profile is covered. The description earns credit by explaining what verification actually entails (hash recomputation plus ledger lookup), which tells the agent this is a deterministic recomputation rather than a mere lookup. It stops short of describing outcome behavior (what a mismatch looks like, whether ledger state can change the answer).

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?

One sentence, front-loaded with the verb and resource, with the mechanism in a trailing clause. No filler.

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 explained, and annotations cover the safety profile. But for a tool whose only input is an opaque nested object, the description leaves the agent without enough to construct a valid call, which is the one gap that matters here.

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 0% and the single parameter is a nested object with additionalProperties:true, so the schema gives the agent no idea what fields a certificate must contain. The description does nothing to compensate — it never sketches the certificate shape, required fields, or an example. This is the definition's biggest weakness.

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 ('Verify an offset certificate') and goes further by naming the mechanism: recompute the hash and check the ledger. That clearly separates it from verify_disbursement and verify_retirement, though it never explicitly contrasts itself with those siblings.

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?

No guidance on when to call this versus the sibling verify_* tools, no prerequisites, and no statement of what a caller should do with a failed verification. The use case is only implied by the word 'verify'.

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