initiate_call

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

Beyond the annotations, the description adds crucial behavioral detail: it may incur charges, it reads established calls before and after, returns the new session, and warns that ringing calls may not appear immediately. This goes well beyond the structured annotation fields and helps the agent anticipate side effects and timing.

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 a single sentence that front-loads the most important warning, states the core action, and then adds essential timing behavior. There is no redundant phrasing or filler, and every clause contributes actionable information.

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 no output schema, the description still covers what happens before, during, and after the call: account changes, potential charges, the returned session, and the eventual visibility of ringing calls. Combined with the annotations, this provides a sufficiently complete mental model for correctly invoking the tool.

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 high at 75%, so the schema already documents most parameters. The description does not add additional meaning about caller, callee, caller_id, or device_id beyond what the schema provides. It stays at the baseline because it neither harms nor significantly enriches parameter understanding.

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 action, 'start a Click2Dial call', on a specific resource (the SIPGATE account), and explicitly warns that it changes the account. This clearly distinguishes it from read-only siblings like call_history and account_info, and from other communication tools like send_sms.

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 makes it clear the tool is for initiating a call, which implies its primary use case. However, it does not explicitly state when to use this tool over alternatives such as send_sms or set_forwarding, and it offers no exclusion criteria or conditional guidance.

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