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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the core action and optional streaming, but omits side effects, error conditions, call lifecycle behavior, and the existence of recording/transcription options. This is a significant gap for a call-routing action.

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 with the primary action front-loaded and the optional behavior in the second sentence. Every word is informative, and there is no filler or 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?

Given the tool's moderate complexity (6 parameters, streaming modes, recording/transcription toggles), the description is underspecified. It fails to explain when streaming is appropriate, how parameters interact, or the expected preconditions (e.g., call must be incoming and unanswered). The output schema exists but does not compensate for the lack of invocation context.

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?

The input schema already contains detailed descriptions for all parameters, including enum-specific behavior for stream_type and stream_channel. The tool description adds no parameter-specific meaning beyond the generic mention of 'media streaming', so it provides minimal value over the 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?

The description uses the specific verb 'Answers' and identifies the resource as 'inbound call', clearly distinguishing it from sibling tools like call_control_create or call_control_audio_play. It also mentions the optional streaming behavior, making the tool's scope unambiguous.

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?

No guidance is provided on when to use this tool versus alternatives such as call_control_streams_create or call_control_audio_play. There is no mention of prerequisites, call state requirements, or exclusions, leaving the agent to infer usage only from the tool's name and purpose.

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