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

With no annotations, the description must carry behavioral disclosure, but it only says titles are discarded. It does not mention whether the tool fetches live data, whether it is read-only, whether it returns a number vs text, or how the many optional parameters are treated.

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?

Two short sentences, no filler, and the core purpose is front-loaded. 'Titles discarded' is a useful qualifier that earns 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?

The tool is simple, but there is no output schema and no annotations, so the description should state the return value and clarify the role of the nine optional parameters. It does neither, leaving an agent uncertain about what to pass and what to expect back.

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 adds little beyond the schema, and 'Titles discarded' largely repeats the feed parameter's description rather than clarifying which of the nine parameters matter or that all are optional.

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 action ('Count'), a specific resource ('current Hacker News front-page stories'), and an explicit boundary ('Titles discarded'). This is immediately distinguishable from sibling tools like web-fetch or status-catalog without needing to inspect the schema.

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 on when to use this tool over siblings, no exclusions, and no mention that the tool likely needs no arguments or how to invoke it. The phrase 'Titles discarded' provides a scope hint, but not a usage context.

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