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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds genuine context beyond that: the per-item output structure and the citation standards used (WHS Act 2011, CDM 2015, OSHA 29 CFR 1926). It does not mention the Pro API key requirement or any rate/usage constraints in prose, which keeps it just short of a 5.

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 sentences, front-loaded with purpose then usage, exclusions, and examples; nothing is padding. The example task list partially overlaps with the `task` parameter's own schema example, which is a small redundancy rather than a defect.

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?

There is no output schema, yet the description compensates by describing the shape of each returned item (requirement, control measure, mandating regulation). Combined with explicit when/when-not guidance and sibling routing, an agent has everything needed to select and call it correctly.

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 the baseline is 3. The description's 'Example tasks' list adds calibration value for the `task` parameter—showing the expected specificity (activity + hazard context)—and the citation examples signal how `region` drives output. It does not add anything about `role` or the api_key beyond the schema.

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?

The description states a specific verb and resource ('Generates a numbered safety checklist') and enumerates the output contents: PPE requirements, hazard controls, and regulatory citations per item. It also names what it is not ('full RAMS document') and points at the sibling that handles that, so an agent can distinguish it from generate_rams and get_inspection_requirements without opening a 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?

It gives an explicit when-to-use trigger ('when a foreman or safety officer needs a task-specific checklist before work begins'), an explicit when-not ('Do NOT use this tool to generate a full RAMS document') with the named alternative, and three worked task examples that show the intended granularity.

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