Feature: Add get_call_transcript Tool

[cassius66]

This pull request introduces a new tool, get_call_transcript, to the Vapi MCP server. This tool allows users to retrieve the full transcript.

The existing get_call tool only returns basic metadata about a call, omitting the rich conversational data that is crucial for analyzing and improving AI assistant prompts.

Implementation

The implementation follows the existing architecture of the MCP server to ensure consistency and maintainability:

1. Schema Definition (src/schemas/index.ts):

   • A new CallTranscriptOutputSchema was created to define the shape of the detailed call data.
   • A GetCallTranscriptInputSchema was added, reusing the existing GetCallInputSchema.

2. Transformer Function (src/transformers/index.ts):

   • A new transformCallTranscriptOutput function was implemented to map the full Vapi.Call object to the new schema, extracting the transcript, messages, and other details.

3. Tool Registration (src/tools/call.ts):

   • The get_call_transcript tool was registered, using the new schema and transformer. It leverages the same vapiClient.calls.get() method as the get_call tool.

4. Documentation (README.md):

   • The README.md file has been updated to include the new get_call_transcript tool in the "Supported Actions" section.

[cassius66]

Tested the MCP server with these changes, works perfectly.