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

Annotations only give the generic profile (not read-only, not destructive, not idempotent). The description adds real behavior beyond that: the tool returns a confirm_url, the link is inactive until the seller signs in with Google and confirms, and no credential is returned or required. This deferred-activation lifecycle and the security note are exactly the context an agent needs.

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 tight sentences, front-loaded with what the tool produces and followed by the confirmation prerequisite. No filler; every clause carries information.

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?

No output schema exists, and the description compensates by naming the returned confirm_url and explaining the two-step activation. Combined with the fully documented input schema, an agent has enough to invoke it correctly.

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%, and the schema already documents the crucial semantics (kind enum, reserve price never shown to buyers, deadline in Budapest time, currency codes). The description adds no parameter-level detail, so the baseline 3 applies.

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 (prepare a sealed-offer link / Make-an-offer button for a listing) and scopes it to what the user sells. The sibling get_offer_link is implicitly distinguished as the retrieval counterpart, so the agent can tell the two apart without opening either 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?

Clearly implies when to call it (you are selling something and need an offer-enabled link) and describes the required follow-up flow. It does not explicitly name when to prefer it over reservoprix_get_offer_link or state exclusions, so it falls short of a full 5.

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