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

Annotations already indicate readOnlyHint=true and idempotentHint=true, which the description aligns with by saying 'Verify'. However, the description adds no additional behavioral detail such as what the verification result looks like, whether it returns a boolean or a report, or any side effects. It does not contradict annotations but contributes minimal transparency beyond them.

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 short sentence, but it is not effectively concise—it is under-specified and uses vague terminology. It is not front-loaded with the primary action (verifying an agent signature); instead it lists abstract security properties. A concise description would state the core function clearly in one or two sentences, but this does not.

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?

The tool has a complex input schema with a nested envelope object containing 13 required properties, and no output schema. The description provides none of the needed context: what the envelope is, how to generate a signature, what 'payload/context integrity' means in practice, or what the tool returns. It is completely inadequate for an agent to call this tool correctly.

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 description coverage is 0%, so the description is the only source of parameter meaning. Yet it mentions none of the parameters (envelope, payload, context, invitation_ref). It does not explain how to construct or interpret the envelope object, or what payload/context refer to. The agent is left with no guidance on how to populate the required fields.

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 says 'Verify' but the object is vague: 'cryptography, payload/context integrity, lifecycle interval, replay and temporal assurance' is a list of security properties, not a clear statement that this tool verifies an agent's signature on a payload/context. It does not distinguish from sibling tools like verify_passport or verify_receipt. The phrase 'for free' is extraneous and confuses rather than clarifies the purpose.

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 guidance on when to use this tool versus alternatives. The description does not mention any conditions, prerequisites, or scenarios for use. An agent would have no idea if this is the right tool for a given verification task.

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