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

With no annotations, the description carries the full burden and does well: it discloses that nothing is reserved or charged until the recipient acts, that the link is secure and pre-filled, and that the person's consent to be contacted at the given email is required. Missing details like link expiry or required permissions keep it from 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?

Three tight sentences, front-loaded with what the tool produces, followed by the recipient flow and the consent prerequisite. No filler or redundancy.

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 6-parameter creation tool with no annotations and no output schema, the description explains the workflow and side effects well but leaves three parameters undocumented and never indicates what the tool returns (presumably the link itself). Adequate but with clear gaps.

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 only 17% (just size), so the description must compensate. It clarifies that size/type must correspond to available inventory and that email is the contact-consent channel, but phone, first_name, and last_name are unexplained in both the schema and the description.

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 and resource (create a booking link) and constrains scope to a size/type that is currently available, which is concrete enough to distinguish it from the read-only siblings. It never names get_facility_info or list_available_units, so the agent must infer that availability must be checked first.

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?

The 'currently available' constraint and the consent prerequisite imply the right context for calling it, but there is no explicit when-to-use, when-not-to-use, or named alternative. The agent is left to infer that list_available_units precedes this call.

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