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

Annotations declare destructiveHint=true and non-idempotent, but the description carries the real behavioral weight: nothing is charged now, the amount is reserved against a spending limit and released on decline, and the request is a binding commitment to pay if accepted. It also discloses the privacy scope ('private between the two of you at every stage'), which no annotation covers.

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 core action, then the prerequisites, then the payment mechanics, then the constraints. Dense but each sentence carries distinct information; the capitalized NOTHING IS CHARGED NOW is a justified emphasis rather than filler.

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 non-idempotent, destructive mutation with no output schema, the description covers financial consequences, eligibility, concurrency limits, and privacy. The main gap is that it does not say what the call returns or how to later reference the created request, which matters given there is no output schema.

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 in the schema, including the useful note that the starting price is a guide not a floor. The description only paraphrases amount and estimated_days at a high level, adding no format or constraint detail beyond the schema. Baseline 3 is appropriate.

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 ('Ask a seller to do something') and immediately scopes it with the two inputs the buyer controls: amount and expected duration. This distinguishes it from the bid-side siblings like submit_bid, which flow in the opposite direction.

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?

Gives strong eligibility context: verified email plus saved payment method required, one pending request per buyer per seller, no self-requests, and the offer must still be active. It never names an alternative sibling (e.g. submit_bid or accept_request) to route against, so it stops short of full when/when-not/alternatives guidance.

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