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

Annotations declare readOnlyHint=true and openWorldHint=true, so safety and open-world nature are covered. The description adds that it returns metadata plus body paragraphs, which is useful, but says nothing about input requirements (canonical URL format), rate limits, or pagination. Adequate but modest given annotations carry the safety profile.

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 waste, purpose front-loaded followed by routing guidance. Nothing extraneous.

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?

Has an output schema, so return values needn't be explained. Correctly notes it returns metadata and body paragraphs. For a single-param read tool with full annotations and output schema, this is nearly complete; only edge cases like invalid URLs are 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 coverage is 100% (single url param fully noted as 'Canonical DW article URL'). The description reinforces 'canonical url' as the input, adding the canonical qualifier which matters for correctness. Baseline 3-4 since schema does the heavy lifting.

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 (Fetch) and resource (public Deutsche Welle article metadata and body paragraphs) with scope qualifier 'canonical url'. Clearly distinguishes this article-detail tool from the sibling list/feed tools.

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 dw_headlines for section stories, dw_sections to discover sections, or dw_news for the general feed.' Names three alternatives and the condition selecting each.

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