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 (safe, non-destructive read) is covered. The description adds the useful 'public' cue (no auth required), but says nothing beyond that; the return contents are documented in the output schema, so no additional behavioral burden remains.

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, both earning their place: the first defines the fetch, the second routes to the discovery siblings. Front-loaded and free of 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?

For a single-parameter read tool with an output schema and annotations, the description covers purpose, inputs context, and sibling routing adequately. Nothing critical is missing, though an explicit statement of what the body content includes (e.g., truncated vs full text) would have pushed it higher.

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% and the url parameter is already described as the 'Canonical France 24 article URL'. The description adds no format, syntax, or constraint detail beyond what the schema provides, so the baseline 3 applies.

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 states a specific verb (Fetch) and resource (one public France 24 article's metadata and body paragraphs), and the scope word 'one' separates it from the batch/list siblings. An agent can immediately tell this retrieves a single article's full content rather than headlines or sections.

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?

It explicitly names the alternative tools (france24_headlines, france24_news, france24_sections) as the way to find story links, implying this tool is used once a canonical URL is already known. Clear context and routing, though it stops short of an explicit 'do not use this to discover articles' exclusion.

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