Cem Karaca contributed to the punkpeye/awesome-mcp-servers and docker/mcp-registry repositories by delivering features focused on multi-server proxy management and integration. He authored comprehensive documentation in Markdown to clarify the architecture and usage of the pluggedin-mcp-proxy, improving onboarding and operational clarity for users managing multiple MCP servers. In docker/mcp-registry, Cem implemented configuration management using YAML, defining core parameters such as server image, API key, and base URL to support consistent deployments. His work demonstrated a methodical approach to API integration and cross-repository alignment, addressing the needs of scalable MCP server aggregation without introducing new bugs during the development period.