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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe read against a live source. The description adds the scoping constraint (one section, values sourced from malaymail_sections) but discloses nothing further about rate limits, pagination, or result recency beyond 'current'.

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?

One sentence, front-loaded with the core action and scope, with the prerequisite appended. No filler and no redundant restatement of the tool name.

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?

With an output schema present, return values need no explanation, and annotations cover the safety profile. For a single-parameter, well-scoped feed tool, the description supplies action, scope, and the prerequisite tool reference, leaving nothing an agent would need before calling it.

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 single parameter's documented values are enumerated in the schema, which sets a baseline of 3. The description goes beyond it by imposing a cross-tool constraint (the slug must originate from malaymail_sections), adding meaningful provenance guidance the schema does not convey.

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 current Malay Mail headline cards') plus a clear scope restriction ('for one public News section'). An agent can distinguish this from siblings like malaymail_article or malaymail_news without opening any 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?

The prerequisite that 'section must come from malaymail_sections' tells the agent which tool to call first, effectively routing it. It stops short of stating exclusions or contrasting with malaymail_news at a deeper level, so it is clear context rather than a full when/when-not guide.

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