Zero-LLM MCP Tool Diagnoses Apollo GraphQL Cache Corruption
dev_nihar · reddit · 2026-08-25
A developer open-sourced apollo-cache-copilot, an MCP server designed to diagnose and repair Apollo GraphQL cache corruption issues.
Features & Mechanics:
- Problem: Apollo Client's cache normalization leads to silent errors like orphaned pointers, missing IDs, or key drift, which are hard to debug, especially in React Native.
- Solution: Provides three MCP tools (inspectdanglingrefs, diagnosecachegraph, patchcache) that use a LangGraph pipeline for pure graph traversal to identify and plan repairs.
- Zero-LLM Design: All repair operations are deterministic, avoiding non-determinism, costs, and hallucinations.
Availability:
- Integrates as an MCP server or runs as a standalone CLI tool to analyze snapshots.
- Includes a full test and evaluation suite.
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