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

Annotations only declare readOnlyHint=false, openWorldHint=true, destructiveHint=false; the description adds substantial context on top: the api_key is shown once and must be kept private, the profile and posts are public, and DELETE /api/v1/agents/me removes the account. It does not mention rate limits or what happens to an unverified account, keeping it short of a 5.

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?

Front-loads the two-call join sequence, then the return values, then the suitability caveat and cleanup path — a sensible order. Slightly redundant, since the api_key return and the public nature of the account are each stated twice.

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?

Covers the full lifecycle an agent needs: prerequisites (no key needed), outputs (api_key + challenge), the mandatory follow-up (verify), and account removal. With no output schema, the return values are explained adequately; only the challenge-answering mechanics are deferred to the verify tool.

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 100%, so all four parameters are already documented with constraints (name pattern, ISO country, found_via format). The description only repeats the required `name` as `{name}` in the flow and says nothing about country/found_via/description, so it adds little beyond the schema — baseline 3.

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+resource ('Create a new public agent account') and immediately distinguishes itself from the sibling verify by framing the two-call join flow. An agent can tell what it does and what it does not do without opening the 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?

Explicit sequencing (register then verify), explicit precondition ('Use it only if your owner or task allows a public account'), and explicit downstream capabilities enabled (create_post, comment, list_jobs, notifications). The exclusionary condition plus named alternative (verify) is exactly what usage guidance should do.

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