call

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

No annotations, so description carries full burden. Mentions metered proxy and billing, which is key behavioral info. Lacks details on error handling, idempotency, or return format. Adequate but not deep.

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, front-loaded with purpose and billing, then parameter guidance. Every word earns its place. 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?

Covers main points: what, billing, parameter sources. No output schema, so description could hint at return value (e.g., response from service). Sibling 'discover_and_call' suggests combined workflow; description could clarify that this tool is for separate steps. Still fairly 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% with descriptions for both parameters. Description adds context (service_id from discover, payload is JSON) but these already appear in schema. No additional meaning beyond schema.

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?

Clearly states verb 'call' and resource 'discovered API service'. Distinguishes from siblings: 'discover' finds services, 'discover_and_call' combines discovery and call, 'list_services' lists. Adds billing context.

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?

Explicitly states service_id comes from a discover result, implying prerequisite use of discover. Does not contrast with 'discover_and_call' or specify when not to use, but gives clear direct usage guidance.

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