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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered structurally. The description adds little beyond that: it names the returned fields, but with an output schema present that is largely redundant, and it says nothing about rate limits, result caps beyond the limit param, or coverage across sources.

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 tight sentences, with the core action front-loaded, the filters second, and the return content last. Only the return-value sentence is arguably wasted space given the output schema.

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?

All six parameters are documented in the schema, annotations are rich, and an output schema exists, so the description does not need to explain return values. It is nearly complete; the missing piece is how this differs from the sibling news tool.

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 description coverage is 100%, so every parameter including the _apiKey and limit range is already documented in the schema. The description echoes the category, country (ISO2) and language filters without adding format or combination semantics, which matches the baseline 3 for schema-heavy tools.

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: 'Search news articles by keywords', followed by the optional filter dimensions. It is clear what the tool does, but it never distinguishes itself from the sibling mediastack_latest_news, so an agent must infer which search variant to pick.

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 word 'Optionally' signals that filters are non-mandatory, which implies the basic usage pattern, but there is no explicit when-to-use guidance, no exclusions, and no reference to alternatives such as latest_news or company_register_search.

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