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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds the 'one public section' scoping constraint and the recency implication of 'Current', but says nothing about pagination, result limits, or how many headlines are returned even though an output schema exists.

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 front-loaded sentence with zero filler; the scope and the prerequisite are both packed into one clause pair.

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 read-only list tool with an output schema and safety annotations, the description covers what an agent needs to call it correctly. Only the headlines-vs-news distinction among siblings is left unaddressed.

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% and the enum-like list of valid slugs is fully documented in the schema, so the baseline is 3. The description's reminder that the section must originate from indiewire_sections adds a small constraint but no syntax or format detail beyond the schema.

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 verb (headlines), resource (IndieWire), and scope (one public section), and explicitly points at the sibling indiewire_sections as the source of valid section values. An agent can distinguish this from indiewire_news and indiewire_article without opening any 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?

The clause 'section must come from indiewire_sections' gives a clear prerequisite that routes the agent to the sibling listing tool first. It does not, however, explain when to choose headlines over the sibling indiewire_news feed, so the alternative-selection story is incomplete.

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