verify_message_signature

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

No annotations are provided, so the description bears the full burden of behavioral disclosure. It only states what the tool does without mentioning potential edge cases, return value behavior, or any constraints. For a read-only verification tool, this lack of detail is a notable gap.

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 a single, concise sentence that directly states the tool's purpose. It is front-loaded with the key information and contains no unnecessary words or repetition.

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?

Given the tool's simplicity and the presence of schema descriptions, a minimal description might suffice for basic usage. However, the lack of behavioral context (e.g., what 'personal_sign' entails, whether the function returns a boolean or throws on mismatch) leaves the agent uncertain about expectations. This could be improved with a sentence on return values or typical use cases.

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 schema provides descriptions for all three parameters (address, message, signature) with 100% coverage. The description adds no extra semantic detail beyond what the schema already contains, so a baseline score of 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 clearly states the tool's function: to verify a personal_sign message signature. It uses a specific verb (verify) and resource (personal_sign message signature), which distinguishes it from related tools like verify_typed_data_signature and verify_signature. The mention of 'personal_sign' adds specificity, making the purpose unambiguous.

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 implies the tool should be used for verifying personal_sign signatures, but it does not explicitly contrast it with alternatives like verify_signature or verify_typed_data_signature. There is no when-to-use or when-not-to-use guidance, leaving the agent to infer the appropriate context from the 'personal_sign' keyword.

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