place_callPlace an outbound phone call from one of the account's RevDesk numbers to a destination. The call is bridged server-side (no audio flows through the AI). Returns a call id for status checks.
| Name | Required | Description | Default |
|---|---|---|---|
| record | No | Record the call (default true) | |
| to_number | Yes | Destination number in E.164 format | |
| from_number | Yes | One of the account's RevDesk numbers, E.164 |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already signal the action is non-read-only and destructive. The description adds genuinely useful behavioral detail: the call is bridged server-side and no audio flows through the AI, plus it returns a call id for status checks. It stops short of explaining call-failure or recording behavior, so not a 5.
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 with no redundancy. The core action is front-loaded, and the following detail (server-side bridging and return value) is useful rather than filler.
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 enough to select and invoke the tool with no output schema present: it explains the main purpose, the required source/destination, the returned call id, and a key behavioral property. It could go further on side effects like call failure or recording, but the schema covers recording defaults.
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%, so the schema already documents the parameters. The description adds a valuable constraint by saying 'from_number' must be one of the account's RevDesk numbers. This is slightly helpful, but the schema is strong.
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 states a specific verb and resource: 'Place an outbound phone call' from an account RevDesk number to a destination. It is clearly distinguishable from sibling tools like send_sms, get_call, and hangup_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?
It clearly frames when this tool is appropriate: for outbound calls from an account number. It also implies the returned call id is used with status-check tools. It does not explicitly mention exclusions or alternative tools, but the purpose statement provides enough context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
Each tool maps to a distinct resource/action: phone number search/buy/listing, call lifecycle, SMS, usage, and caller IDs. There is no meaningful overlap between tools like list_calls and get_call, since one is a list and the other is a single-record lookup.
All tool names follow a clean snake_case verb_noun pattern: buy_phone_number, list_calls, place_call, send_sms, search_available_numbers. The verbs are specific and consistently reflect the action being performed.
Ten tools is well-scoped for a telephony/product API server. The count covers the essential actions across phone numbers, calls, SMS, usage, and caller IDs without unnecessary duplication or bloat.
The tool set covers the core workflow well: search/buy numbers, list numbers, place/list/get/hangup calls, send SMS, view usage, and list caller IDs. Minor gaps exist such as no way to release a phone number, manage caller IDs beyond listing, or check SMS delivery status, but these do not break the primary use cases.