MCP Memory Server Enforces Verbatim Evidence Before Saving Relationships
Far_Pangolin_7657 · reddit · 2026-08-29
The author built an MCP (Model Context Protocol) memory server that enforces strict persistence rules: relationships are only saved if the model can provide verbatim evidence.
Key Features:
- Evidence-Driven Writes: Every edge must carry a verbatim quote naming both endpoints; otherwise, it is rejected with reasons like edgenoevidence.
- Deterministic Filtering: Exclusion rules are applied in code before and after model runs, ensuring the model cannot bypass instructions.
- Immutable History: Edits are forward-only revisions with rollback support; background enrichment is fenced to avoid overwriting human edits.
- Source-Linked Storage: Raw text is stored at accept time, preserving context even if extraction fails.
The server exposes 11 MCP tools (save, recall, rollback, etc.). The author notes current limitations: hosted on Cloudflare (not local-first), async writes, and no third-party audit. The engine is Apache 2.0 licensed, though the newest modules are not yet on GitHub.
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