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

Annotations declare readOnlyHint=true, so the safety profile is covered. The description adds useful behavior detail—Ed25519 signature check and payload return on success—but does not describe what happens on invalid signatures (error shape, exception, or null return), leaving a gap 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?

The description is short and front-loaded with the core action. The Args section duplicates the schema's own parameter description, which is minor waste, but overall it is efficiently sized.

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 single-parameter read-only verification tool with a 100%-covered schema and an output schema present, the description is nearly complete. The only meaningful omission is failure behavior, but return structure is presumably covered by the output schema.

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 100%, and the single parameter jws is fully documented in the schema. The description's Args line repeats the schema text verbatim without adding format, syntax, or validation details, so baseline 3 is appropriate.

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?

The description states a specific verb (verify) and a precise resource (MoltGuard Verifiable Credential JWS signature), and adds that it checks the Ed25519 signature and returns the payload on success. This makes the operation clear, though it does not explicitly distinguish itself from the many other *_verify siblings beyond the MoltGuard naming.

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 explicit guidance on when to use this tool versus alternatives such as molcheck_verify, molproof_verify, or moltrust_verify. The description implies it is for verifying a MoltGuard credential but offers no conditions, exclusions, or prerequisites for selection.

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