Resolved

FastMCP 2.0 migration reveals unused legacy files and missing MCP features

Python
FastAPI
MCP
Migration
Legacy Code
Code Analysis
Backend
Refactoring

Codebase analysis shows 2 unused Python files including critical MCP resources and prompts not migrated to FastMCP 2.0 | Legacy dd.py contains unmigrated horse/parent profile resources and response templates

Issue

During the migration to FastMCP 2.0, two legacy Python files (auth.py and dd.py) were left unused in production. The dd.py file contained critical MCP resources and prompt templates that were not migrated, creating potential gaps in context efficiency and response quality. Specifically, the dd.py file included horse and parent profile resources, as well as server-defined response templates, which are missing from the current implementation.

Missing Features

  1. MCP Resources:
    • Horse profile endpoints for retrieving statistics, ratings, and history.
    • Parent profile endpoints for retrieving parent-related information.
  2. Prompt Templates:
    • Structured templates for booking requests with predefined Swiss professional tone guidance.
    • Multi-turn conversation templates for follow-up negotiations.

Culprit

The migration to FastMCP 2.0 focused on tool functions, successfully migrating components like find_horse() and create_booking() to booking_mcp_server.py. However, it overlooked:

  • MCP Resources: Server-exposed data endpoints that provide contextual data without requiring tool calls.
  • Prompt Templates: Server-defined conversation templates to ensure consistent response formatting and quality.

Solution

To address these gaps, the following steps were taken:

Immediate Actions

  1. Archive auth.py: The unused JWT framework file was moved to an archive directory.
  2. Migrate Critical Features from dd.py:
    • Implemented MCP resources for horse and parent profiles to provide necessary context data.
    • Integrated prompt templates for booking requests and follow-up negotiations to ensure consistent response formatting.

Migration Priority

  • High: Booking request prompt templates to maintain response quality and consistency.
  • Medium: Profile resources to improve context efficiency in tool responses.
  • Low: Follow-up negotiation prompts to enhance multi-turn conversation capabilities.

Verification Process

  • Runtime Usage Check: Verified that no runtime references to the legacy dd.py file exist.
  • Reference Search: Ensured no remaining references to unmigrated MCP resources or prompts remained in the codebase.

These changes ensured a complete migration of legacy features to the new FastMCP 2.0 architecture, improving both functionality and maintainability.