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

The description adds meaningful behavioral context beyond annotations: it warns that the key is returned once and returns a private aa_ key, and cautions against repeating a lost verification. This aligns with and enriches the destructiveHint=true and idempotentHint=false annotations. But it does not state whether the proof is consumed/destroyed on failure, what happens on success vs failure, or any auth requirements, leaving gaps for a destructive, non-idempotent operation.

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 tightly written sentences, front-loaded with the core action and payoff, with no filler. The warning is appended efficiently. It is not longer than needed.

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 destructive, non-idempotent, three-parameter verification tool with no output schema and 0% parameter coverage, the definition is thin. It mentions the returned key but omits critical context about the parameters, failure behavior, and relationship to sibling credential tools, so it is only minimally sufficient.

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% — none of the three required parameters (agent_id, challenge_id, solution) have descriptions. The description mentions the 'locally computed proof' (solution) only obliquely, and does not clarify agent_id or challenge_id at all or where they are obtained. Given the low coverage baseline, the description should compensate but does not.

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 conveys an action (submit a locally computed proof) and an outcome (returns a private aa_ key), which is more than a tautology. However, it never states the resource or goal explicitly — verification of an agent — and does not distinguish itself from sibling tools like certify_flow, register_agent, or claim_certification that share the same credential/proof domain. The purpose is inferable but vague.

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 instruction 'Do not blindly repeat a lost verification' gives one important when-not-to-use cue, implying idempotentHint=false behavior and warning against retries. But there is no positive guidance on prerequisites (where agent_id, challenge_id, and solution come from) or which sibling to use when verification is not the right path. Usage is implied rather than articulated.

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