macrumors_headlines

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds useful context: the headlines are 'fresh' (recent, not stale cache) and sourced from a 'public' section (no auth implied). It does not disclose the output shape, whether the response is a list of titles only or includes links/dates, or what happens with an invalid section. This is adequate for a simple read-only fetch but not rich.

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 with the core action front-loaded. The only minor flaw is the repeated word 'headlines' across both sentences, which is slight redundancy but not enough to cost more than one point.

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 one-parameter enum-gated fetch tool with no output schema, the description covers the surface-level facts: what it returns and from where. It omits the return format and any behavior on invalid input, and it could point to macrumors_sections for discovering valid sections, though the enum already lists them. Adequate but with clear gaps.

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%: the single `section` parameter is fully described as a 'MacRumors section slug' and its four enum values are enumerated. The description adds little beyond the schema—'one public MacRumors section' mildly reinforces the single-section scope—so the baseline 3 applies.

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+resource ('Get MacRumors section headlines') and adds that it 'returns fresh headlines from one public MacRumors section.' It is specific enough to separate from headline tools for other sites, and the 'one public section' phrasing distinguishes it from a general site-wide headlines feed. It doesn't explicitly differentiate from the close sibling macrumors_news, so it falls short of a 5.

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 phrase 'from one public MacRumors section' implies this is the right tool when you need headlines scoped to a single section. However, there is no explicit when-to-use guidance, no exclusions, and no mention of alternatives like macrumors_article for full content or macrumors_sections for enumerating sections—despite those tools being present in the sibling list.

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