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

Adds real context beyond the annotations: the management token is required, the call does not deliver an event, and activation is conditional ('when valid'). The annotations already cover safety shape (idempotent, non-destructive, open-world), so the remaining gap is failure behavior when the challenge is invalid, which is not described.

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 tight sentences, front-loaded with the action, followed by the prerequisite and the alternative. No filler or restatement of the title.

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 mutation tool with no output schema, the description supplies the prerequisite ordering, the postcondition (no event delivered), and the sibling to use for read-only inspection. Error handling for an invalid challenge is the only notable omission.

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 100%, so hookId and managementToken are already fully documented in the schema; the description only echoes the management-token requirement. The 'exact challenge' referenced is not itself a parameter, so it adds workflow meaning but not parameter semantics. Baseline 3 is correct.

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?

States a specific verb (verify/activate) and resource (destination), and distinguishes itself from register_destination (the prerequisite) and get_destination_status (the non-activating alternative). An agent can place this tool in the workflow without opening any schema.

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?

Gives an ordered prerequisite ('First publish the exact challenge returned by register_destination'), a near-exclusion ('does not deliver an event'), and a named alternative ('Use get_destination_status to inspect progress without activation'). This is explicit when-to-use and when-to-use-something-else guidance.

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