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

With no annotations, the description carries the full burden and does well: it discloses result ordering (DuckDuckGo's newest-first order), return fields, page size (~25 articles), safe_search's default of moderate (corroborated by the schema), and per-call billing of 1 Credit. It omits auth requirements and rate/error behavior, keeping it short of a 5.

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 dense sentences that front-load the resource and ordering, then pack return fields, pagination size, and billing with no filler. Every clause 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?

Given 5 parameters at 100% schema coverage and no output schema, the description supplies exactly what structured data cannot: the shape of returned articles, page size, ordering guarantee, and cost per call. Only auth and failure-mode context are missing.

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 the baseline is 3. The description reinforces the ordering semantics and page size implied by the page parameter and enumerates the output fields, but adds no per-parameter syntax or format detail beyond the schema.

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 ("DuckDuckGo News for a query") and pins down scope: news articles, ordered newest-first. The resource noun cleanly separates it from siblings get_images, get_videos, and get_places, so an agent can pick it without opening another 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 description never says when to reach for news search versus the sibling get/get_images/get_videos tools, and lists no exclusions or prerequisites. Usage is only implied by the resource name, which is weaker than explicit routing guidance.

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