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

Confirms and enriches the readOnlyHint by stating nothing is registered or stored, and adds an auth-relevant fact (no account or token needed) that annotations don't cover. It never describes the shape of the returned request, which is the one behavioral detail left implicit.

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-loaded with the purpose, then when-to-use, then notes, then an example — a clean priority order. The example is long but earns its length by demonstrating a nested payload, which plain prose could not do as compactly.

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 nested objects and no output schema, the description carries the burden of showing input shape, and the example does that well. The residual gap is that the returned "ready request" is never characterized, so the agent knows what to send but not what comes back.

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 baseline would be 3; the description exceeds it by giving a full worked example that shows realistic values for agent.name, agent.description, mandate.purpose, places, actions_per_day and duration_days, illustrating how the optional fields get used. It still does not explain the meaning of actions_per_day or the ≤90-day bound beyond what the schema states.

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 pair (validate + return a ready request) on specific resources (agent profile, mandate), plus a side-effect disclaimer ("Nothing is registered or stored") that prevents confusion with tools that actually register. The prerequisite mention of how_to_join anchors it against the sibling set.

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 when-to-use line naming the predecessor tool (how_to_join) and the intended consumer of the result (the guarantor), plus an explicit exclusion: never include the guarantor's personal details. That is the when/when-not/alternative pattern at full strength.

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