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

The readOnlyHint and openWorldHint annotations already declare this as a safe, live-web read. The description adds only the freshness signal ('currently'), and says nothing about return shape, story count limits, or pagination behavior beyond what annotations cover.

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?

A single efficient sentence with the resource front-loaded and zero wasted prose. The '[hackernews]' namespace prefix is mild noise but harmless.

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?

For a trivial one-optional-parameter read tool this is nearly sufficient, and annotations cover the safety profile. However, with no output schema, an agent gets no hint of what a 'story' contains, so the description is slightly thin for invocation confidence.

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 single 'limit' parameter has 100% schema description coverage ('Max stories (1-30)'), so the schema carries the semantics. The description adds nothing about the limit, but the baseline of 3 applies when coverage is complete.

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 names the specific resource ('Stories currently on the Hacker News front page') with a clear scope qualifier ('currently'), which lets an agent distinguish it from the sibling hackernews_search. It lacks an explicit verb (list/fetch), but the resource is unambiguous.

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?

Usage is only implied: 'currently on the front page' suggests this is the tool for browsing the live front page rather than searching, and hackernews_search is the obvious alternative. No explicit when-to-use/when-not guidance is given.

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