x402-endpoint-intel

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

With no annotations, the description carries full burden. It discloses data source ('Stall's proprietary on-chain dataset, 4.1M+ Base mainnet settlements'), scope ('80,000+ operators, 10+ days of live traffic'), and that it is read-only (no mention of mutations). No contradictory behavior noted.

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 efficiently structured: first sentence states purpose, second lists outputs, third gives use cases, fourth explains data source, fifth quantifies coverage. Every sentence adds value with no redundancy.

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?

Given the tool's simplicity (single parameter, no output schema), the description is complete. It defines input, outputs, use cases, data source, and coverage. The lack of output schema is partially mitigated by listing return fields. Slightly incomplete regarding exact format or potential errors.

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 baseline is 3. The description does not add additional meaning beyond the schema's description of the 'target' parameter (URL or wallet address, auto-detected). The description enumerates returned fields but not parameter details.

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 clearly defines the tool's purpose: providing market intelligence for x402 endpoints or operator wallets. It lists specific returned data (settlement volume, payer count, price range, reputation tier, activity window, description) and distinguishes from siblings through specificity. No sibling differentiation is needed as the tool is unique.

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 when to use the tool: 'before routing agent spend, vetting a counterparty operator, or benchmarking competitor pricing.' It does not mention when not to use it or provide alternatives, but the context is clear.

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