Buy a HoodGrow prepaid credit bundle

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

Beyond the destructiveHint=true annotation, the description adds crucial behavioral details: 'REAL, irreversible USDC payment', balance lands only after settlement confirmation, and requires HOODGROW_PRIVATE_KEY. These go well beyond what annotations convey.

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?

Three sentences, each carrying distinct information: payment mechanism, prerequisites, and settlement/verification steps. The final sentence about HOODGROW_USE_CREDITS is slightly tangential but still relevant for follow-up action. Dense but not bloated.

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 complexity (real payment, side effects, setup requirements), the description covers all key aspects: what it does, when to use it, irreversibility, settlement timing, prerequisites, verification, and next steps. No output schema needed; return behavior is implicitly covered.

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 schema already covers bundleId with examples and source. The description adds the fact that list_credit_bundles also provides prices (not just IDs), giving the agent additional useful context for selecting a bundle. This slightly exceeds the schema 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 uses a specific verb ('Pays for') with a clear resource ('prepaid credit bundle via x402') and explicitly points to list_credit_bundles for IDs/prices, distinguishing it from sibling tools that list bundles or check balances.

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 explicit when-to-use context: required only with HOODGROW_PRIVATE_KEY, while noting bearer-key setups don't need credits. It also directs to get_credit_balance for verification and explains the HOODGROW_USE_CREDITS setting to start spending, effectively telling when to use this vs. per-call x402.

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