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 and determinism profile is fully covered. The description adds that the payload is static reference content with external links and coverage areas, but says nothing about the shape or length of what is returned.

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. The trailing 'with the right links and the areas covered' is slightly loose but still conveys useful scope information.

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 zero-parameter static information tool with no output schema, the description covers the subject matter thoroughly enough to answer 'what will I get back'. A brief note on the return format would make it fully complete, but the gap is minor.

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?

The tool takes zero parameters, so the baseline is 4. The description correctly implies no input is needed — it is a fixed lookup — and adds nothing misleading about inputs.

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 informational outcome — how to book an EICR, EV charger survey or other electrical work with Energy North — and lists the scope (links, areas covered). It is clear this returns booking guidance rather than performing a booking, but it does not distinguish itself from the guide-oriented siblings (get_guide, search_guides).

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?

No when-to-use statement and no reference to any alternative. An agent must infer from the topic alone that this is the right tool for booking questions rather than calling get_guide or search_guides.

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