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

No annotations are provided, so the description carries the full burden. It discloses that the tool lists prices and payment details, and states 'Free,' which may indicate cost or free access. However, it doesn't mention whether the output is a simple list, whether it requires authentication, or any rate limits. For a read-only informational tool this is adequate but not comprehensive.

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 extremely concise: two short phrases ('Free.' and 'Lists tools, prices and payment details of this server.'). It front-loads the potentially important cost hint and then specifies exactly what is listed. Every word earns its place with no redundancy.

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 no parameters, no output schema, and a simple informational purpose, the description covers the essential content: what is listed and the server scope. It doesn't specify the format of prices or whether all tools are included, but these are minor for a listing tool. It is mostly complete for an agent to call it appropriately.

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 has zero parameters, so the schema is already fully covered (100%). The description adds no parameter information because there are none, which is appropriate. Baseline for a no-parameter tool is 4, and nothing detracts from that.

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 clear verb ('Lists') and a specific resource ('tools, prices and payment details of this server'). It distinguishes this tool from its siblings (check_email_domain, detect_tech_stack, extract_webpage) by focusing on pricing/ payment info. Not a tautology and clearly informative.

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 explicit when-to-use or alternatives are given, but the purpose is self-evident: when an agent needs pricing or payment details of the server. The 'Free.' opener hints that cost is a relevant factor, though it doesn't clarify whether this tool itself is free or the server's tools are free. Usage is implied rather than explicitly guided.

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