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

Beyond the annotations, it discloses the auth requirement ('connected identity and claim:write') and actionable retry semantics ('Preserve request_id and payload on retries'), which reinforces idempotentHint with concrete guidance. It does not cover rate limits or lifecycle concerns such as how long a challenge stays valid.

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?

Three short sentences, front-loaded with purpose then return value, then constraints - no padding. The mention of 'payload', which is not a schema parameter, is the one small bit of noise.

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?

With no output schema it correctly describes what is returned, and it surfaces the auth scope, which is the most important missing structured data. However, for a 2-required-param tool at 0% schema coverage it leaves service_id completely undefined and introduces an undeclared 'payload' concept.

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 0%, so the description must carry parameter meaning, yet it never explains service_id and references a 'payload' that is not a declared property. Only request_id is given any semantic context (preserve on retries), leaving the required service_id opaque.

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 opening sentence states a specific verb+resource ('Create a service-control challenge'), and the follow-up clarifies it produces HTTP/DNS proof instructions, which cleanly distinguishes it from verify_publisher_claim. It does not, however, name the sibling it complements, so the agent must infer the pairing.

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?

It gives a clear selection condition - 'submission attribution is insufficient' - which tells the agent when this path is needed rather than a submission-based one. It stops short of explicitly naming alternatives or sequencing into verify_publisher_claim.

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