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

Goes well beyond readOnlyHint/openWorldHint: it discloses that no API key is required, that the feed is truncated to the latest few items, and that each successful call costs $0.002 in USDC via x402 with failed calls free. Pricing and truncation are non-obvious behavioral facts an agent must weigh before calling.

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?

Four compact sentences, each carrying distinct payload: source/purpose, filter scope, coverage limitation, auth and pricing. Purpose is front-loaded and nothing 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?

With an output schema present, return values need no explanation, and the annotations cover the safety profile. Coverage limits, auth requirements, cost, and filter semantics are all supplied, leaving no material gap for a two-optional-parameter search 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 coverage is 100%, so both q and limit are already documented. The description only adds that the keyword filter also covers categories (beyond the schema's title/summary), which is marginal and slightly inconsistent with the schema wording; baseline 3 applies.

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 source (FreightWaves) and a specific mechanism (public RSS feed with keyword filtering), so the agent knows exactly what this returns. It is distinguishable from the many other news siblings by source name, though it never explicitly contrasts itself with them (e.g. search_google_news).

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?

'Feed carries only the latest few items' is an explicit scope limitation that tells the agent when this tool will underperform. It stops short of naming an alternative for historical or deep coverage, so it is clear context rather than full when/when-not routing.

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