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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds meaningful behavioral context by explaining the consequence of a completed challenge, namely the private binding of the traveler to this MCP session. No contradiction with annotations exists.

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?

Two tight sentences with no filler. The main purpose is front-loaded ('Check whether...'), and the additional binding context is compact and relevant.

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 simple one-parameter, read-only status check, the description provides enough context about what the challenge is and its scope. There is no output schema, so a slightly more explicit statement about the returned status shape would strengthen it, but this omission is minor given how straightforward the tool's purpose is.

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 must compensate, and it partially does by clarifying that the challenge is a code or email-link challenge within this session. However, it never explicitly says challengeRef is the identifier returned from start_traveler_verification or how to obtain it, leaving that connection implied rather than direct.

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 uses a specific verb ('check whether') and names the exact resource: 'a code or email-link challenge started in this MCP session.' It clearly targets completion status and even explains what completion means ('binds the traveler privately'), distinguishing this from sibling tools like start_traveler_verification and verify_traveler_code.

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 gives useful scope ('started in this MCP session') but never explicitly says when to use this tool instead of a sibling or what steps should precede it. The workflow is implied rather than stated, so an agent must infer that this follows starting a challenge and that it is not for verifying codes or checking handoff status.

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