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

Annotations already declare idempotentHint=false, so restating non-idempotency is partly redundant, but the description adds the concrete consequence: two calls with the same name produce two distinct categories, which is the actionable detail an agent needs. The endpoint reference (POST /InsertEventCategory) adds traceability. It doesn't cover auth requirements, though for a create with no annotation for permissions that's minor here.

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 short sentences plus an endpoint reference, with the purpose front-loaded and the caveat immediately after. The endpoint string earns only marginal value but costs little. No wasted prose.

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 two-parameter create with full schema coverage this is mostly adequate, but there is no output schema and the description says nothing about the response — notably whether the new category's identifier is returned, which an agent would need for follow-up calls. That gap is unaddressed.

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%, so both parameters (name, active with its default) are already documented in the schema. The description adds only the conceptual gloss that the name is a grouping label, not any syntax, constraints, or default behavior beyond what the schema states. 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?

Specific verb+resource ("Create an event category") with a parenthetical that defines the domain concept ("a label to group events"). It's trivially distinguishable from the sibling waiverfile_list_event_categories, but that distinction comes from the verb itself rather than any explicit contrast.

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 non-idempotency warning implies the workflow (check waiverfile_list_event_categories before creating to avoid duplicates), but the agent must infer that. There is no explicit when-to-use or when-not-to-use statement, and no mention of prerequisites or permissions.

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