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

Annotations already mark the operation read-only and non-destructive, so the description's contribution is the result-composition detail: each result carries price, vendor page, and checked date. That adds transparency about what the agent gets back without contradicting annotations. Not every edge behavior (e.g., pagination) is disclosed, but the bar is low with annotations present.

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?

The description is compact and front-loaded: purpose first, filter list, result detail, then a labeled WHEN TO USE with alternatives. No sentence is wasted.

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 search tool with zero required parameters and full schema coverage, this description covers purpose, filters, result content, and sibling routing. The absence of an output schema is offset by the 'Every result carries...' sentence, and examples pin down the intended use cases.

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 paraphrases the query, category, free_tier, and max_price filters but adds no new semantics beyond the examples; the limit param is left wholly to 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?

States a specific verb ('Search') and resource ('TopAlternativesTo's catalogue of software tools'), enumerates the available filters, and differentiates from siblings by pointing to get_alternatives and get_tool for different intents.

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?

Explicit 'WHEN TO USE' section gives concrete example queries ('project management tools under 15 dollars'), and clearly states when to use get_alternatives ('replace a specific tool') and get_tool ('full detail on one'). This is clear routing guidance with no inference required.

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