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

The readOnlyHint annotation already establishes the safe-read profile, so the description is not carrying the safety burden. It adds genuine context beyond the annotations: the exact return shape ('Returns {Count}') and the underlying API call (GET /forms/{identifier}/comments/count.json), which tells the agent this is a cheap non-paginated aggregate call.

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 short, front-loaded statements: what it does, what it returns, and which endpoint backs it. No filler or restatement of the title.

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 correctly compensates by naming the return shape ({Count}), and the single required parameter is covered by the schema. Minor residual gaps remain (e.g. whether the count spans all entries and whether deleted/spam comments are included), but nothing blocks a correct call.

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 single 'form' parameter is fully documented in the schema, including its hash/URL-title forms and a pointer to wufoo_list_forms. The description adds nothing beyond that, so the baseline of 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 and resource ('Count all comments on a form's entries'), which cleanly distinguishes it from the listing sibling (wufoo_list_form_comments) and from the entry-counting siblings (wufoo_count_form_entries, wufoo_count_report_entries). An agent can pick this tool without opening any 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?

The counting semantics imply when to use it (when only a total is needed rather than the comment records), and the sibling list makes the list/count split inferable. However, there is no explicit 'use this instead of X when Y' statement or any prerequisite guidance, so usage is only implied.

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