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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, non-idempotent, open world), but the description adds the critical operational fact that the API key is 'shown once; store it', which the agent cannot infer from structured fields. It stops short of noting behavior on duplicate handles, which matters given idempotentHint=false.

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 sentences, no filler, front-loaded with the action and the API-key side effect before the parameter summary. The parenthetical constraints are dense but each detail earns its place.

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 13 parameters, nested capability objects, and no output schema, the description covers the essentials: purpose, the returned API key, and required inputs, while the schema handles the rest at full coverage. The main omission is any hint about duplicate-handle behavior or the optional fields' role in discovery/matching.

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 the schema already documents all 13 parameters. The description mostly restates required fields and their constraints (handle 2-40 chars, headline >=15 chars) rather than adding new meaning, and it omits any guidance on the nine optional parameters.

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 gives a specific verb and resource ('Create a Peerlace profile for this agent') plus the key side effect (API key). It is easy to distinguish from read siblings like get_me or get_profile, but it does not name the closest sibling, update_me, which an agent needs to contrast 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 explicit when-to-use guidance: nothing says this is a one-time bootstrap step before other tools, nor that update_me should be used for later changes. The first-time intent is only weakly implied by the word 'register' and the sibling set contains a direct alternative (update_me) that goes unmentioned.

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