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

Annotations only say readOnly and openWorld; the description adds genuinely new operational facts: the feed is public with no API key, coverage is limited to latest items only, cost is $0.002 in USDC per successful call via x402 across Base, Solana or Arc, and failed calls are not charged. The billing and auth details are exactly the kind of context an agent needs before invoking a paid endpoint.

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 lead sentence is front-loaded and informative, but the sibling-routing clause is boilerplate that repeats full tool names and descriptions verbatim, and the pricing sentence is dense with implementation detail. Roughly half the text is reusable template padding rather than information specific to this tool.

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?

An output schema exists, so return values need not be explained, and the description covers source, auth, cost, filtering, and alternatives. The main remaining gap is what 'latest items only' means concretely - how many feed entries are considered or how far back the feed reaches - which matters for judging result completeness.

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 (q, limit) are already documented, so the schema carries the burden and baseline is 3. The description adds only a mild nuance by noting that the keyword filter also applies to categories, which the schema's 'title or summary' wording omits, but it says nothing about matching behavior, recency window, or the 1-30 limit range.

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 states the resource (The Intercept articles), the source (its public RSS feed), the filtering mechanism (keyword filter on title/summary/categories), and the recency scope (latest items only). It lacks an explicit verb phrase of its own and relies on the tool name for the 'search' semantics, but an agent can distinguish it from other news tools without opening 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 explicitly routes two sibling alternatives with the condition that selects them (search_al_jazeera_articles when you need Al Jazeera latest articles; search_bbc_news_articles when you need BBC top stories). It gives no guidance on when to prefer this over aggregator tools such as search_news_across_the_web or search_google_news, so the routing is partial rather than exhaustive.

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