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

Beyond annotations (readOnlyHint false, destructiveHint true), the description adds that it creates a card, processes fiat via Ramp, settles on Base mainnet, and discloses a ~30 second timeframe. It also mentions the return of pacs.002 and SFDR PAI indicators, plus the lack of pre-funding, which are not present in the annotations.

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 compact: five sentences conveying the core purpose, mechanism, timeline, outputs, and prerequisites. Every sentence adds value and the main purpose is front-loaded, with no wasted words.

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 10-parameter, complex settlement operation, the description covers the essentials: the combined card creation and settlement action, the roles of Ramp and DPX, the settlement asset options, the quick settlement time, the confirmation returns, and the lack of pre-funding. The output schema and annotations handle the remaining structural details, making it 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?

All 10 parameters are already documented in the input schema with descriptions (100% coverage), so the schema carries the parameter semantics. The description adds general context (e.g., settlement in USDC/EURC, source currency via Ramp) but does not provide additional per-parameter meaning beyond the schema, aligning with the baseline 3 for high coverage.

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 begins with 'Execute a DPX stablecoin settlement funded by a Ramp Agent Card' which precisely names the action and resource. It further distinguishes from sibling tools by noting it 'combines card creation and settlement in one call', which separates it from separate card settlement or execution tools.

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: requires a connected Ramp account, handles fiat conversion, settles on Base mainnet in ~30 seconds, and does not require crypto pre-funding. These conditions help an agent determine when to use it, though it doesn't explicitly name alternative tools or exclusions, so it doesn't reach a 5.

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