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

Annotations already declare readOnlyHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description's 'changes nothing and can be repeated safely' largely restates those hints, though 'No auth needed' and the mention of the registry public key add some non-annotation context.

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?

Three short sentences, front-loaded with the resource and its content. The final READ-ONLY sentence partly duplicates what the annotations already convey, which is minor redundancy but not bloat.

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 carries the burden of describing the return and does so (signed Merkle tree heads, registry public key). For a parameterless read tool it is largely complete, missing only routing against the checkpoint siblings.

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?

Zero parameters, so the rule sets a baseline of 4. Schema coverage is 100% and there is nothing for the description to disambiguate; no parameter guidance is required or missing.

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 (Read) and a precise resource: signed Merkle tree heads over the sealed identity and treasury logs, plus the registry public key. An agent knows exactly what this returns. However, it does not differentiate itself from the sibling checkpoint_consistency or checkpoint_crank, which likely also concern checkpoints.

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 description establishes context (no auth needed, safe to repeat) but never says when to reach for this versus checkpoint_consistency or checkpoint_crank. Usage is only implied by the word 'latest'. No explicit when/when-not or alternative routing.

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