Open Source Insights: 5 Lessons from Integrating MCP into a Local-First App
mkngsm · reddit · 2026-07-30
The author shares practical insights from integrating MCP (Model Context Protocol) into an open-source, local-first Kanban app. In this architecture, data lives in the browser's IndexedDB and syncs to a server, while MCP acts as another peer using the same store and conflict resolution mechanisms.
Key Lessons Learned:
- Safe Deletion: Implementing tombstone deletions and a trash feature is crucial. It's also highly recommended not to give MCP the ability to permanently delete data.
- Decoupled Design: Extracting MCP tools into a separate package allows both the backend and MCP to share a generic store layer.
- Minimal Instructions: Instructions provided to the model should be kept to a minimum, as the model tends to over-interpret and overuse any features mentioned.
- Actionable Errors: Returning actionable error messages helps the model understand how to work around issues autonomously.
- AI-Assisted Testing: Using the assistant itself to test the application and generate detailed logs is highly effective.
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