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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuine value by disclosing the payload shape (scored hit row, decoded fingerprint flags, attached conversions), but says nothing about size limits, missing conversions, or failure behavior.

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?

A single front-loaded sentence with no filler; 'full story' is slightly promotional but the rest is dense and informative. Nothing is redundant.

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, so the description must carry the return-value burden, and it does sketch the response (hit row, fingerprint flags, conversions). It is adequate for a one-parameter read tool, though it could note what happens when no conversions exist.

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?

Only one parameter, click_id, and the schema documents it at 100% coverage as a Click UUID. The description adds no parameter detail, but with a single fully documented parameter the baseline of 4 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 resource (one click) and enumerates what it returns: the scored hit row with decoded fingerprint flags plus all conversions on it. That distinguishes it from list_clicks, 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?

Usage is only implied by the singular 'one click' framing; there is no explicit statement of when to use this versus list_clicks or list_conversions, and no prerequisites or error conditions (e.g. unknown click_id) are mentioned.

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