dispatchCall

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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this is a mutating operation. The description adds that the tool initiates a real call, which is helpful, but does not disclose potential side effects like billing or call duration. With annotations covering the safety profile, the description adds minimal extra behavioral context.

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 two sentences long, front-loaded with the primary action, and includes a necessary formatting constraint. It contains no fluff or redundancy, making it highly concise and well-structured.

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?

The description is adequate for a tool with a rich schema and annotations, but it lacks any mention of what happens after the call is initiated (e.g., returns a call ID or status). Given there is no output schema, a brief note on the expected response would improve completeness.

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 description coverage is 100%, and the schema already documents all parameters including agent_id, to_number, call_context, and from_number_id. The description adds no new parameter semantics beyond restating the country code requirement already present in the schema, so the baseline 3 is appropriate.

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 'Initiate' and clearly identifies the resource: a call to a phone number using a specified agent. This distinguishes it from sibling call-related tools like listCallLogs or createBulkCall, which handle different operations.

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 provides no guidance on when to use this tool versus alternatives such as createBulkCall for bulk calls or listCallLogs for viewing calls. The only usage hint is the prerequisite that the phone number must include a country code, but that is a formatting instruction rather than tool-selection guidance.

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