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

Annotations already declare the tool as read-only, non-destructive, idempotent, and open-world. The description adds value by specifying what is returned (full article text, author, source URL, publication time) and the filtering options. However, it does not disclose rate limits, pagination behavior, or potential latency, which would enhance transparency.

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?

The description is highly concise, consisting of two sentences that capture the core functionality and output. It is front-loaded with the primary action and immediately provides key details without unnecessary elaboration. Every sentence earns its place.

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 simple, read-only tool with comprehensive annotations and an output schema (as indicated in context signals), the description covers all necessary aspects: what the tool retrieves, the filtering options, and the returned fields. No critical information is missing for the agent to select and invoke it correctly.

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?

Input schema coverage is 100%, with each parameter having a description. The description redundantly mentions the filters (language, country, category) and lists example categories, adding marginal meaning beyond the schema. It does not elaborate on parameter interactions or defaults beyond what 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?

The description clearly states the tool fetches latest breaking news with specific verb ('Get') and resource ('latest breaking news'). It specifies coverage (70+ countries, 18+ languages) and available filters. However, it does not distinguish itself from sibling tools like 'currents.news.search' or 'news.global.latest', leaving room for ambiguity.

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 description implies usage for retrieving current news but does not provide explicit guidance on when to use this tool versus alternatives. There are no statements about when not to use it or which sibling tools to prefer for specific use cases (e.g., searching archived news). The context is clear but lacks directives.

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