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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the valid-value constraint (sourced from punch_sections), which is useful behavioral context, but says nothing about freshness, pagination, or result size beyond 'current'.

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 tight sentence with the scope front-loaded and the parameter constraint following; no wasted words and nothing buried.

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 an output schema present, return values need no explanation, and annotations cover the read-only profile. The one input is documented in both schema and description, so the definition is essentially complete; only freshness/pagination behavior is 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 property already enumerates the documented slug values. The description adds only the provenance of valid values (punch_sections), which is a marginal gain over what the schema provides.

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+resource (headlines) scoped to 'one public section' of Punch, which is clear enough to distinguish it from punch_article and punch_news. It doesn't explicitly name the sibling it differs from, but the routing constraint to punch_sections gives strong differentiation.

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?

'section must come from punch_sections' supplies a clear prerequisite for valid invocation, effectively routing the agent to the sibling that enumerates slugs. It stops short of stating when to prefer this over punch_news or punch_article, so no explicit when-not guidance.

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