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

The description adds substantial behavior beyond the annotations: it discloses the public/no-key access model, the paywall limitation, per-successful-call pricing, the accepted payment networks, and that failed calls are not charged. These details are exactly what an agent needs to understand cost and data availability.

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?

The description is compact and front-loaded: source, content limitations, access model, and pricing each appear in a single efficient sentence. No sentence is redundant.

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 two-parameter read-only search tool with annotations and an output schema, the description covers source, freshness, content limits, authentication, and billing. Nothing material is missing for correct selection or invocation.

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 both parameters are already well documented in the schema. The description reinforces the keyword filter on title/summary and latest-items behavior, but does not add syntax or constraints beyond what the schema provides.

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 identifies a specific source (WSJ World News via the public Dow Jones RSS feed) and clearly limits scope to headlines and short summaries with an optional keyword filter. This distinguishes it from the many other source-specific search tools in the sibling list without requiring the 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?

It clearly frames the tool as a public RSS headline feed with latest items only, and it warns that full articles are paywalled and not returned. It does not explicitly name alternatives for full-text article retrieval, but the limitation provides clear usage context.

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