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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true, so safety is covered. The description adds genuinely new behavioral context beyond the annotations: the response is a single page and continuation uses keyset paging by passing next_cursor as start_cursor. It stops short of stating auth requirements or rate limits.

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 sentences, front-loaded with what the tool returns, followed by the endpoint and the paging mechanics. 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 read-only, 13-parameter paged list with no output schema, the definition covers purpose and the paging contract, which is the main thing an agent needs to iterate pages. It does not discuss how the numerous filters combine or what the page payload contains, a minor gap given the rich schema.

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% across all 13 parameters, so the schema already documents code, name, sort_by, per_page, date bounds, and cursor semantics. The description only gestures at vehicle/code/last-occurrence and restates the cursor relationship already in the schema, adding little beyond it.

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 (List) and resource (diagnostic trouble codes / faults) plus the source (telematics devices) and the returned fields (vehicle, code, last occurrence). This cleanly separates it from sibling list_* tools for vehicles, issues, work orders, etc.

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 implied by the resource name rather than stated: nothing says when to prefer this over fleetio_list_issues or fleetio_get_vehicle, and no filtering scenarios are suggested. The only operational guidance is the paging note, which is useful but not a when-to-use rule.

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