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

Goes beyond the readOnlyHint/openWorldHint annotations with genuinely useful operational facts: public feed with no key required, results limited to latest items, and a per-call cost model ($0.002 USDC via x402 on Base/Solana/Arc) where failed calls are not charged. The cost and no-auth disclosures materially affect an agent's decision to call it. It does not describe pagination or freshness windows, which keeps it off 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?

The opening is well front-loaded, putting source and freshness before the alternatives and price. But the sibling-routing sentences are garbled fragments ("from its public;", "...wire feeds: PR.") that waste space and undermine the routing information, and the pricing sentence is dense with payment detail relative to its decision value.

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 annotations covering safety, an output schema covering return shape, and full parameter documentation, the description supplies what structured fields cannot: data provenance, key-free access, freshness scope, and cost. The main residual gap is the mutilated alternative-tool guidance, which leaves the sibling comparison incomplete rather than the tool's own call requirements.

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% and both parameters are fully documented in the schema, so the baseline is 3. The description's mention of a title/summary keyword filter largely restates the schema's own wording, and it adds nothing about the non-obvious fact that limit is typed as a string or about maximum result behavior.

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 named resource (US Department of Justice press releases) plus the exact upstream source (justice.gov public RSS feed) and the filtering mechanism (keyword on title/summary). An agent can distinguish this immediately from search_prnewswire_press_releases and search_press_release_multi_wire without opening any 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?

Explicitly routes the agent to two alternatives with the condition that selects each (PR Newswire health-category items vs. merged multi-wire results). However, both routing sentences are truncated mid-clause ("from its public;" and "merged from public wire feeds: PR."), so the discriminating conditions are only partially legible, and there is no when-not-to-use guidance beyond the sibling mentions.

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