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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds that the slugs are 'live-verified,' implying the returned identifiers are currently valid for use, but it does not describe refresh cadence, ordering, or output shape. Modest incremental value over annotations.

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 sentences, zero filler. The identity of the tool is front-loaded and the routing advice follows immediately.

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 no-param tool with an output schema and read-only annotations, the description covers what the agent needs: what the tool returns and how it fits the punch_* workflow. Nothing critical is missing.

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?

Zero parameters, so baseline is 4. The description clarifies what the returned list contains (topic slugs consumable by punch_headlines), which is the only semantic the agent needs for a parameterless call.

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 and resource ('List Punch's live-verified topic slugs for its headlines feed'), and immediately names the three sibling tools it is not (punch_headlines, punch_news, punch_article). An agent can distinguish it from siblings without opening a 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?

Explicitly routes the agent: use punch_headlines with one topic, punch_news for the general feed, punch_article for a single story. This tells the agent both when to use this tool (to discover topics) and which alternative to pick for other intents.

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