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

With no annotations, the description carries the full burden. It clearly discloses that the tool 'does not move funds' and that it returns payment requirements for the runtime to sign, which is a key behavioral trait. It also explains the bundle behavior (one payment unlocks all reports). It doesn't mention rate limits or failure modes, but the core behavioral disclosure is strong.

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 dense but well-structured: it front-loads the core purpose, then provides usage scenarios, then the bundle special case. Every sentence adds value, though the bundle explanation is slightly verbose. It earns a 4 for being informative without 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 has no output schema and no annotations, the description does a good job explaining what the agent will receive (delivery URL and x402 payment requirements) and how to use it. It covers the main use cases and the bundle option. It could mention what happens if an invalid id is passed or whether the tool verifies payment status, but for a payment-requirement tool, the description is largely complete.

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 the baseline is 3. The description adds meaning beyond the schema by explaining the semantic meaning of id values (e.g., 'pair-us-cn' for comparing two economies, 'region-apac' for regional snapshot, 'bundle' for entire catalog) and the discount rationale. It also clarifies the format parameter indirectly by mentioning delivery URL. This exceeds the baseline.

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 specific verb ('Return the delivery URL and the x402 payment requirements') and resource ('paid macroeconomic report'), and explicitly distinguishes itself from siblings by noting it does not move funds. It also names the sibling report_payment_requirements implicitly by clarifying this tool returns both the URL and payment requirements, which helps an agent select it over alternatives.

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 gives explicit when-to-use guidance: 'Call it whenever an agent needs cross-country macro data' and enumerates concrete id values for different use cases (pair, region, shock, country-risk, bundle). It also provides a clear alternative for a different scenario ('For one theme only, pass id="bundle" with ?category=.'), which is a routing instruction. This is strong usage guidance.

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