x402 ecosystem stats (free)

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

No annotations are provided. The description fails to disclose data freshness (e.g., how often the snapshot updates), rate limits, or whether the output is static or dynamic. For a tool with zero annotations, the description carries the full burden and doesn't address these behavioral traits.

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?

Two sentences: first enumerates data points, second gives usage guidance. No redundant words. Every sentence 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, no-output-schema tool, the description is adequate but lacks details on output format, update frequency, or size limits. It covers the 'what' well but misses the 'how' and 'limitations,' leaving some gaps for an agent to navigate.

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 input schema has zero parameters, so schema description coverage is 100%. The description adds value by explaining the content of the snapshot, though this is more about output. Baseline for no params is 4, and the description does not detract.

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 uses specific verbs like 'aggregate snapshot' and lists exact metrics (endpoints, settlement volume, etc.). It clearly distinguishes from sibling tools like x402_endpoint_history or x402_trust_score by focusing on ecosystem-wide stats.

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?

The description explicitly states 'Use this to gauge market health before transacting,' providing a concrete when-to-use scenario. It could be improved by explicitly naming when not to use (e.g., for individual endpoint details), but the context allows inferring differentiation from siblings.

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