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Telnyx MCP Server

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by team-telnyx

get_call_control_application

Retrieve a specific call control application configuration from the Telnyx MCP Server to manage telephony settings and routing rules.

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 carries full burden. It states 'retrieve' which implies a read operation, but doesn't disclose behavioral traits like authentication requirements, rate limits, error conditions, or response format details beyond 'Dict[str, Any]'. For a tool with no annotations, this leaves significant gaps in understanding how it behaves.

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

Conciseness4/5

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

The description is appropriately sized and front-loaded with the core purpose in the first sentence. The Args and Returns sections are structured but could be more concise. No extraneous information is included, though the parameter mismatch slightly reduces efficiency.

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

Completeness2/5

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

Given no annotations, 0% schema coverage, no output schema, and a complex nested parameter structure, the description is incomplete. It doesn't explain the 'request' object, provide error handling, or detail return values beyond a generic type. For a retrieval tool in this context, more guidance is needed to be fully helpful.

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

Parameters2/5

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

The description adds minimal semantics: it notes 'id' is required and identifies the application, but schema description coverage is 0% with 1 parameter, and the input schema shows a nested 'request' object instead of a direct 'id'. This creates confusion as the description doesn't align with or clarify the schema structure, failing to compensate for the low coverage.

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 clearly states the verb 'retrieve' and the resource 'specific call control application', making the purpose unambiguous. It distinguishes from sibling tools like 'list_call_control_applications' by specifying retrieval of a single item. However, it doesn't explicitly contrast with 'create_call_control_application' or other siblings, keeping it from a perfect score.

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?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing an existing application ID), exclusions, or comparisons to sibling tools like 'list_call_control_applications' for browsing or 'create_call_control_application' for creation. Usage is implied but not explicitly stated.

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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