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

Annotations already establish readOnly, idempotent, and non-destructive behavior, so the bar for supplemental disclosure is lower. The description adds valuable behavioral detail about the return contents: bounded scope, deliverabels, delivery time, limitations, sample-report links, and exact prices. No contradiction with annotations.

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 dense, front-loaded sentences with no filler. The first sentence states comparison purpose and scope; the second lists return fields and the next-step guardrail. Every clause earns its place.

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 parameters, an output schema present, and annotations covering side-effect safety, the description supplies the remaining essential guidance: what to compare, what data to expect, and when to call order_service. Nothing important is missing for an agent to invoke this tool 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?

The tool takes zero parameters and the input schema documents 100% coverage, so there is no parameter semantics for the description to supplement. This is the baseline expected for a parameter-less tool.

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 uses the specific verb 'Compare' and identifies the exact resource: KnownFix's $49 first-look report and deeper website, public-codebase, agent-commerce, and release-pipeline reviews. This clearly distinguishes it from generic sibling tools like list_catalog and list_skills.

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 not only states what the tool does but explicitly routes the agent: 'Call order_service only after choosing a service and confirming authority over the public target.' This provides both sequencing and a condition for advancing to the sibling tool.

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