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fastmcp-me

Telnyx MCP Server

by fastmcp-me

get_call_control_application

Retrieve a specific call control application by ID to view its configuration and telephony settings.

Instructions

Retrieve a specific call control application.

Args: id: Required. Identifies the call control application.

Returns: Dict[str, Any]: Response data

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
requestYes
Behavior2/5

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

No annotations are provided, so the description must carry the full burden. It implies a read-only operation via 'Retrieve,' but does not disclose error behavior, permissions, or side effects (if any). The return type 'Dict[str, Any]' is vague, and the mismatch between the documented 'id' and the schema's 'request' adds confusion.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded, with clear Args/Returns sections. However, the Args section inaccurately lists 'id' instead of 'request,' undermining the structure. It is concise but not well-formed due to the incorrect parameter documentation.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, no annotations, and a vague input schema (request object with additionalProperties), the description must compensate. It does not explain how to construct the request, what the response contains beyond a generic Dict, or how this differs from list_call_control_applications. The id/request mismatch leaves the agent unable to correctly invoke the tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has one required parameter 'request' (object, additionalProperties true) with 0% coverage. The description instead mentions an 'id' argument, which directly contradicts the schema. This misleads the agent about what to pass, and no meaning is added to the actual 'request' parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description begins with 'Retrieve a specific call control application,' which clearly states the action and resource. The word 'specific' differentiates it from sibling 'list_call_control_applications,' though it does not explicitly name the alternative.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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 like list_call_control_applications. There is no mention of prerequisites, exclusions, or typical use cases. The only hint is the word 'specific,' which implies fetching one item, but this is not explicit.

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

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