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

Goes well beyond the annotations by disclosing externally visible side effects: the email is sent to a vendor CRM with the report link and triggers at most one follow-up. Annotations only say openWorldHint=true and readOnlyHint=false; the description tells the agent exactly what leaves the system and how often, plus that there is no usage limit.

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?

Four short sentences, each carrying distinct information — payload contents first, then side effects, then the consent constraint, then rate limits. Nothing is repeated and the most decision-relevant facts are front-loaded.

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 no output schema, the description does the work of describing return contents, and it covers side effects and limits thoroughly. It omits failure modes such as an invalid report id or a rejected email domain, which matters for an open-world tool that sends data externally.

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 is 3, but the description adds real semantic weight: it explains what the email is used for (CRM record, follow-up) and constrains it to user-provided consent addresses, and ties `id` to audit_site. That is meaning the schema's terse field descriptions don't convey.

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 (unlocks) and resource (report), and enumerates exactly what the unlocked payload contains: failing/warning checks with details, platform-specific fixes, and the written summary. It's clearly distinguished from get_report by framing this as the full/paid unlock, though it never names the sibling explicitly.

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 a hard precondition — only call with an email the user supplied for this purpose — which is usable when-to-call guidance with a clear exclusion. It doesn't say when to prefer this over get_report or how to handle a missing email, so it stops short of full routing guidance.

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