make_call

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

No annotations are provided, so the description carries the burden of disclosing behavior. It explicitly states that the agent will call the number and follow its configured prompt, which reveals the side-effecting nature of the tool. However, it omits potential consequences such as call charges, asynchronous behavior, failure modes, or whether the call actually connects.

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 short sentences with no filler. The primary action is front-loaded, and the second sentence adds useful behavioral context about the agent following its configured prompt.

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 parameters are fully documented in the schema and the purpose is clear, but the description lacks usage exclusions, side-effect caveats, and any indication of what happens after the call is initiated. With no output schema and no annotations, slightly more context would make the tool fully self-sufficient.

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 each parameter already has a meaningful description, including E.164 format for phone_number and the ownership constraint for from_number. The tool description adds little parameter-specific meaning beyond referring to the provided phone number and the configured agent prompt, so the baseline of 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 starts with a specific verb ('Initiate') and a clear resource ('outbound phone call'), and it clarifies that the call is made by a specific agent. It is unambiguous about the core function, though it does not explicitly distinguish this tool from siblings like debug_call.

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 no when-to-use or when-not-to-use guidance and names no alternative tools. The intended usage is only implied by 'Initiate an outbound phone call,' which is insufficient given the presence of debug_call and other related tools in the sibling list.

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