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

With no annotations, the description carries the burden and does disclose key traits: this call is free, it's a read-only health check, and the paid alternative requires USDC payment on Base L2 via x402 with a specific endpoint and body. It doesn't state rate limits or auth, but the cost and payment mechanics are unusually well disclosed.

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 two compact sentences, front-loaded with the free action and what it returns, then the paid alternative. Slightly dense with an embedded URL and JSON body, but every element earns its place.

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 zero-parameter, free read tool with an output schema, the description covers purpose, free vs paid split, and the paid path's mechanics. It is largely complete, though it could clarify what 'fresh' means or how IndexNow status should be interpreted.

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?

The tool takes zero parameters, so the baseline is 4. The description adds useful meaning by identifying the fields returned and the paid endpoint's slug-array parameter, though the schema itself is empty.

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 a clear verb and resource: read live news pipeline health for the CCN feed, listing specific outputs (article count, newest slug, minutes since newest, IndexNow status, sitemap URL count). It is specific and distinguishable from siblings like get_crypto_news, though it doesn't explicitly name that sibling as the contrasting 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?

It provides clear context: use this to tell whether the feed is fresh before paying for anything, and it routes paid per-article divergence checks to a separate x402 endpoint. It gives a when-to-use and a cost-based boundary, but doesn't explicitly exclude or compare against named sibling tools.

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