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

No annotations exist, so the description must carry the full burden. It only says 'Titles discarded,' which is cryptic and unexplained. It does not disclose return format, error behavior, or side effects, leaving critical behavioral traits unaddressed.

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 short but under-specified, not appropriately concise. It omits essential information about the parameters and usage, so brevity does not earn its place; it sacrifices necessary detail.

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 9 parameters, no annotations, no output schema, and no guidance, the description is grossly inadequate. An agent cannot determine what inputs to provide, what the tool returns, or how to use it correctly, making the tool effectively unusable.

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?

While schema description coverage is 100%, the description adds no meaning beyond the schema. Worse, the parameter descriptions (e.g., 'Git ref name; discarded after the shape check') seem entirely unrelated to counting HN stories, actively confusing rather than clarifying how the tool operates. The 'Titles discarded' hint does not explain which parameters are meaningful.

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 states the tool counts current Hacker News front-page stories, a specific verb-resource pair. However, it does not differentiate from sibling tools, and the nine-parameter schema with unrelated fields (city, timezone, path, etc.) contradicts the apparent narrow scope, creating ambiguity about what the tool actually does.

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?

The description provides no guidance on when to use this tool versus alternatives, such as web-fetch or fetch-status. It neither states context nor exclusions, leaving the agent to guess why 9 optional parameters are relevant to counting HN stories.

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