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

readOnlyHint=true already tells the agent this is a safe, non-mutating operation, so the description only needs to add scope — and it does, by listing the four things checked (sequence, hashes, city signatures, contents). It does not say what happens on failure, whether a report is returned, or the cost of a full-chain recheck, which for a verification tool would be genuinely useful.

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 front-loaded sentence: the action and its scope come first, followed by a compact enumeration of what is verified. Every clause earns its place and there is 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?

For a zero-parameter, read-only verification tool with no output schema, the description covers what is checked and is sufficient to call it correctly. It is only slightly thin on what the agent should expect back (a pass/fail verdict vs. a detailed report), which no structured field supplies either.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; per the baseline, an empty schema warrants a 4. No syntax or format detail is missing because no inputs exist.

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 (ricontrolla = re-verify) and resource (l'intera catena del registro) and enumerates the verification targets: sequenza, impronte, firme della città, contenuti. This is clearly distinct from a plain read like leggi_registro, though it never names that sibling explicitly, so it stops short of a 5.

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 verb 'ricontrolla' implies an integrity-check use case, but there is no explicit when-to-use guidance, no prerequisites, and no routing between this and leggi_registro (read) or cerca_archivio. The agent must infer that this is for validation rather than inspection.

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