@mnemoscope/mcp-server

MCP server exposing Mnemoscope's context-rot scoring, tiered reading, and signed journal tools to any Model Context Protocol–compatible client (Claude Code, Cursor, ChatGPT desktop, anything that speaks MCP over stdio).

100% local. No cloud. No telemetry. Apache-2.0.

Install

npm install -g @mnemoscope/mcp-server
# the `mnemoscope-mcp` binary is now on your PATH

Or run via npx without a global install:

npx -y @mnemoscope/mcp-server

Connect to Claude Code

// ~/.claude/settings.json
{
  "mcpServers": {
    "mnemoscope": {
      "command": "npx",
      "args": ["-y", "@mnemoscope/mcp-server"]
    }
  }
}

Restart Claude Code. The four tools below are discovered automatically.

Tools

Tool	Input	What it returns
predict_rot	vault_path	0–100 risk score, dominant factor, full factor breakdown, top-5 risk notes, vault stats
get_tiered_read	vault_path, optional working_max_age_days, episodic_max_age_days	Working / episodic / semantic split of the vault by freshness
record_journal	vault_path, session_id, op (read/write/create/delete), target_path, optional content	The signed entry, including its sig, keyFingerprint, and prevHash
read_journal	vault_path, optional session_id	All journal entries, or a single session's

Example — predict_rot

{
  "rot_risk": 41,
  "dominant_factor": "tokenVolume",
  "factors": {
    "tokenVolume": 100, "semanticRedundancy": 0,
    "distractorDensity": 2.65, "structuralCoherence": 100, "freshnessSpread": 0
  },
  "top_risk_notes": [
    { "relPath": "brainstorms/.../transcript.md", "approxTokens": 13439, "reason": "very large note" }
  ],
  "vault_stats": { "noteCount": 113, "approxTokens": 506823 },
  "baseline_model": "v0-heuristic",
  "version": "0.1.0"
}

Bootstrap a vault

Before the journal tools work the vault needs an Ed25519 keypair. The companion @mnemoscope/cli ships mnemoscope-init for that:

npx -p @mnemoscope/cli mnemoscope-init /path/to/your/vault

The auto-onboarding modal in the Obsidian plugin does the same on first launch.

Verify the journal

npx -p @mnemoscope/cli mnemoscope-verify /path/to/your/vault

Exits non-zero on field tampering, hash-chain break, or entries signed by a key the current vault does not own.

What this server does NOT do

• It does not store or transmit your vault content. All reads are local; all writes are local.
• It does not call any external service. (The optional mnemoscope-timestamp CLI in @mnemoscope/cli POSTs only a SHA-256 digest of each journal entry's signature to a public OpenTimestamps calendar — never any vault content.)
• It does not replace a memory store. It is an instrument for one — see the README for the comparison with Letta, Mem0, Zep, Cognee, MemPalace, and Smart Connections.

Repo + docs

• Source, issues, releases: https://github.com/toonight/Mnemoscope
• Architecture, threat model, scientific posture: see the main README

License

Apache-2.0.