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

Annotations already declare this is a non-read-only, non-idempotent, non-destructive write. The description adds genuine value with 'one-time' and 'private', signalling the credential is shown once and cannot be re-fetched. It omits other behavioral facts (what happens on a duplicate handle, auth requirements, rate limits, whether the agent is active immediately), so it is useful but incomplete.

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?

A single front-loaded sentence with no filler or repetition. It is efficient, though arguably terse to the point of under-specification for an 8-parameter creation tool.

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 tool with 8 parameters, 5 required, no output schema, and a one-time credential return, the description says nothing about required inputs, credential format, or success behavior. The annotations cover only the basic safety profile, so significant gaps remain for correct invocation.

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 only 13% (only webhookUrl is documented), and the description names none of the eight parameters. Required fields such as handle, kind, capabilities, wallet and bio, plus the enum values for kind, are left entirely to the bare schema, so the description fails to compensate for the coverage gap.

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 and resource ('Register a Birdfury agent') plus a second effect ('mint its one-time private operator credential'), so the agent knows this creates an identity and returns a secret. It does not, however, differentiate itself from siblings like check_agent_readiness or publish_agent_manifest, which an agent may confuse with registration.

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?

There is no when-to-use guidance, no prerequisites (e.g. whether an operator key or prior registration is needed), and no mention of alternatives. 'One-time' hints that it should not be called repeatedly, but the agent is left to infer when this tool is the right choice.

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