@provenclave/mcp — OCC MCP Server

Model Context Protocol (MCP) server that exposes OCC commit and verify as Claude-native tools. Any Claude agent can create and verify tamper-evident cryptographic proofs without writing a single line of code.

Tools

| Tool | What it does | |------|-------------| | commit_text | Commit any string (model output, JSON, text) → returns OCCProof | | commit_file | Commit a local file by path → returns OCCProof | | verify_proof | Verify an OCCProof against its original bytes/file | | health | Check if the OCC notary is reachable |

Install in Claude Desktop

Add to ~/.claude/claude_desktop_config.json:

{
  "mcpServers": {
    "occ": {
      "command": "npx",
      "args": ["-y", "@provenclave/mcp"]
    }
  }
}

Restart Claude Desktop. You'll see the OCC tools appear in the tool picker.

Install in Claude Code

claude mcp add occ -- npx -y @provenclave/mcp

Environment Variables

| Variable | Default | Description | |----------|---------|-------------| | OCC_NOTARY_URL | https://nitro.occproof.com | OCC notary endpoint |

Example Agent Usage

Once installed, a Claude agent can say:

"Commit my report to OCC and save the proof"

Claude will call commit_file or commit_text automatically and return the proof JSON.

Or in a system prompt:

After generating any final output, always call commit_text with the result and include the returned digestB64 in your response so the user can verify provenance.

Self-hosting

Point OCC_NOTARY_URL at your own OCC service:

OCC_NOTARY_URL=http://localhost:8787 npx @provenclave/mcp

Related

• provenclave — core library for offline verification
• OpenAPI spec — machine-readable API description
• Live Proof Studio — browser-based commit + verify UI
• GitHub