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

No annotations are provided, and the description does not disclose side effects, network access, caching, error behavior, or return format. It also does not state whether the tool is read-only or what it returns beyond a count.

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 brief and front-loaded with the main action, but the appended 'Titles discarded' is cryptic and does not clarify output or behavior. It adds ambiguity without earning 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 nine optional parameters and no output schema, the description leaves out how to invoke the tool, what it returns, and how it relates to sibling tools. The tool is incomplete for an agent to use 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?

All nine parameters have descriptions, but they appear unrelated to the purpose: ref, url, city, feed, host, json, path, zone, and query with generic descriptions like 'JSON text to validate' or 'IANA timezone name'. None of them are explained in the context of counting Hacker News stories, and all are optional, leaving parameter semantics effectively meaningless.

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 clearly identifies the tool's function: count current Hacker News front-page stories. It names a specific verb and resource, though the phrase 'Titles discarded' is ambiguous about what the tool actually returns.

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 guidance is provided on when to use this tool versus sibling tools like web-fetch or fetch-status. It does not mention prerequisites, context, or alternatives.

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