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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and open-world profile is covered. The description adds that this pulls from the 'public feed' and the 'general top-story stream' – useful scope context beyond the annotations – but says nothing about ordering, result limits, freshness, or rate limits, so it stays at baseline-plus rather than 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?

Three sentences, zero waste. The core capability is front-loaded, and the sibling routing follows in a logical order. No filler.

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?

An output schema exists, so no return-value documentation is needed. With annotations covering safety and an empty schema, the description delivers exactly what an agent needs: what it returns, its scope, and where to go for the three adjacent operations.

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 correctly implies the tool takes no inputs by describing it as a fixed top-story stream, matching the empty input schema without adding contradictory param hints.

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 ('Fetch Deadline top stories') and immediately scopes the result to the general top-story stream. It explicitly distinguishes itself from deadline_headlines, deadline_sections, and deadline_article within the same description.

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?

Routes the agent precisely: section-specific lists go to deadline_headlines, slug discovery to deadline_sections, and single-article bodies to deadline_article with a returned URL. When-to-use and each alternative are named explicitly.

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