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

Annotations already mark it read-only and open-world. The description adds valuable operational context beyond annotations: Google News primary with GDELT/Bing fallbacks, 5-minute caching, and $0.003 per-call x402 payment (USDC on Base or Solana). Rate limits are not mentioned, but the added behavioral disclosure is substantial.

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?

Front-loaded with purpose, then return fields, filters, caching and price. Every sentence carries operational value with no filler. Minor repetition of the title's phrase, so 4.

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 six-parameter read-only search with no output schema, the description supplies returned fields (headline, source, link, publish time), source hierarchy, filters, cache and pricing. It omits limit/pagination behavior, but is otherwise complete enough.

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 only 33%. The description adds filter categories for language, country and age, and expands when values to 30d, which helps interpret lang/country. However, it never explains the limit parameter and gives no format detail for lang/country beyond what the schema patterns show. Partial compensation supports a 3.

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 'Search' and resource 'recent news' with scope 'any topic, company or token.' It is clear, but it does not explicitly distinguish itself from the sibling 'news' tool.

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?

Implies use for query-based recent-news retrieval by saying 'for a query,' but gives no when-to-use vs when-not guidance or named alternative such as the sibling 'news' tool. No explicit exclusions or routing guidance.

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