KruschFS MCP (krusch-fs)

PGit + KruschNexus for Your Operating System & Multi-Node Fleet — Standalone, opt-in OS Filesystem & Page-Anchored Memory MCP Server (v0.3.1).

krusch-fs is a lightweight, opt-in Model Context Protocol (MCP) server that indexes files across your local operating system and optional remote SSH fleet nodes in-place (zero file duplication) and binds every semantic memory, configuration rule, and retrieved snippet directly to a 1-based KruschNexus page ((host_node, file_id, page_number, anchor_page_hash)).

✨ Core Architectural Pillars

1. Universal 1-Based KruschNexus Page Spine

• Consumes krusch_nexus in Zero-Config Library Mode (parse_file, chunk_document_pages, format_citation) without running duplicate OCR workers or copying files into a staging vault.

• Every indexed file (PDF, DOCX, CSV, HTML, Markdown, systemd .service, .conf, /etc/fstab, and redacted .env) is segmented into deterministic 1-based pages (fs_pages) with a per-page SHA-256 page_hash.

• Single-Page Delta Re-Indexing: Editing page 42 of a 120-page PDF or section 3 of a Markdown runbook only re-embeds page 42 and only flags memories anchored to page 42 as is_drifted=True, leaving pages 1..41 and 43..120 untouched.

• Pointer-Slice Chunk Deduplication (v0.3.1): Because fs_pages.page_text already stores the normalized text for each 1-based page, fs_chunks stores only char_start..char_end offsets (content="") whenever a chunk is a clean slice of page_text, slicing snippets in-memory during search() to eliminate 2x SQLite database bloat.

• Inode Move & Rename Resilience: Moving or renaming a file on the same filesystem updates file_path and citations in-place via (host_node, device_id, inode, file_hash) without re-parsing or losing page-anchored memories.

2. 3-Zone Workspace Isolation & Zero-Trust Privacy Shield

• user_docs: PDFs, DOCX contracts, spreadsheets, notes, and manuals in ~/Documents, ~/Downloads, and project docs/.

• system_config: /etc/systemd/system, /etc/fstab, /etc/hosts, .conf, and .env files.

  • .env Value Redaction (KEYS_ONLY): Secret values are replaced with KEY=[REDACTED] (on the remote node before crossing SSH) while indexing variable names as config_rule page memories so agents can ask "Where is DATABASE_URL configured?" without ever exposing secret values.

  • Private Key Vault Lock (VAULT_LOCKED): SSH keys (id_rsa, id_ed25519), .pem/.key/.kdbx files, and browser cookie DBs are never read or embedded.

• repo_boundaries: Any directory containing .git is automatically recorded as a lightweight boundary pointer (handoff_repo="krusch-git:<repo>") and skipped so krusch-git remains the single source of truth for source code.

3. Multi-Node SSH Fleet Indexing

• Works out of the box on a single workstation, or indexes an entire fleet of Linux/macOS machines via ~/.krusch-fs/fleet.json (see fleet.example.json) using agentless SSH stdlib streaming (stream_remote_node_entries).

• Sleeping or offline machines are probed in <2s (probe_node_ssh) and cleanly skipped (status="offline_skipped") until powered on.

Related MCP server: code-rag-mcp

🛠️ 6 Canonical MCP Tools

All 6 tools declare explicit MCP behavioral annotations (readOnlyHint, destructiveHint, idempotentHint, openWorldHint):

⚙️ MCP Server Configuration

Add krusch-fs to your mcp_config.json (Claude Desktop, Cursor, Windsurf, or Antigravity):

{
  "mcpServers": {
    "krusch-fs": {
      "command": "krusch-fs-mcp",
      "env": {
        "KRUSCH_FS_DB_URL": "sqlite:////home/your-user/.krusch-fs/fs_memory.db",
        "KRUSCH_FS_FLEET_CONFIG": "/home/your-user/.krusch-fs/fleet.json"
      }
    }
  }
}

🚀 Quickstart & CLI

# Install in editable mode
pip install -e .

# (Optional) Configure multi-node SSH targets outside the repo
mkdir -p ~/.krusch-fs
cp fleet.example.json ~/.krusch-fs/fleet.json

# Synchronize local workstation and all online fleet nodes
krusch-fs sync-fleet

# Inspect fleet-wide index statistics
krusch-fs status

# Search across all fleet nodes (or pass --node compute-node-01)
krusch-fs search "ExecStart" --workspace system_config

# Inspect the 1-based page tree of any indexed file
krusch-fs tree /etc/fstab --node compute-node-01

# Run the MCP server over stdio
krusch-fs-mcp

🧪 Testing

pytest tests/ -v