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

The readOnlyHint and openWorldHint annotations already cover the safety profile, while the description adds material behavioral context: $0.002 per successful call, x402 payment on Base/Solana/Arc, and failed calls not charged. It does not discuss pagination or rate limits, but the pricing and charging policy are substantial additions beyond 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?

The description is a single dense sentence that front-loads the two usage modes and then covers returned fields and pricing. It has no filler, though the semicolon-heavy structure and pricing tail slightly reduce readability.

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?

Given the full schema, output schema, and annotations, the description covers both operating modes, relevant inputs, returned fields, platform scope, and payment behavior. Nothing critical for correctly invoking the tool is missing.

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 schema already documents limit, company, country, and category. The description reinforces the mode semantics and the software-development-only country restriction, but adds little syntax or format detail beyond what the schema provides.

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 the platform (GoodFirms), the resource (IT service companies), and the two output modes (ranked category list or single-company dossier) with returned fields. It clearly distinguishes list mode from dossier mode, but does not explicitly differentiate itself from sibling directories such as b2b_clutch_reviews or b2b_g2_software_categories.

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?

Explains that category/country selects list mode and a company slug selects dossier mode, which implies how to use the parameters. However, it gives no explicit when-to-use or when-not-to-use guidance relative to alternative company-review or directory tools.

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