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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is well covered. The description adds value beyond the annotations by naming the SMI identity endpoint and explaining that the resolved account identity is the return payload. It could mention invalid-token behavior, but this is a minor gap for a zero-parameter verification call.

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 sentence that front-loads the action, names the target system, and states the result. There is no redundant or filler wording.

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 no-parameter, read-only, idempotent verification tool with no output schema, the description is nearly complete: it states what is verified, where verification happens, and what is returned. The only notable omission is the exact structure of the resolved identity or failure behavior, but the annotations and simplicity of the call reduce the impact of that gap.

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 has zero parameters)Skip and schema description coverage is trivially 100%, so there is no burden on the description to document parameters. Baseline for a zero-parameter tool is 4, and the description appropriately focuses on behavior rather than parameters.

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 specifies the exact action ('verifies'), the resource ('session Personal Access Token'), the endpoint ('SMI identity endpoint'), and the expected outcome ('returns the resolved account identity'). It is clearly distinct from the sibling smi_* tools, which handle exports, reports, subjects, and uploads rather than access verification.

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 when to use the tool—whenever an agent needs to verify the current session PAT or resolve the account identity—but it does not explicitly state when not to use it or name any alternative. There is no direct sibling alternative, so the implied usage is clear enough, but explicit routing guidance is missing.

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