Sentrul Server

Run Sentrul research, compliance, and trace-lookup agents from any MCP-aware client. 257 production agents behind one gateway.

Version: 0.1.0 | SDK: @modelcontextprotocol/[email protected] | License: MIT

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Install (Claude Desktop)

Add this snippet to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "sentrul": {
      "command": "npx",
      "args": ["-y", "sentrul-mcp-server"],
      "env": { "SENTRUL_API_KEY": "optional — free tier auto-provisions" }
    }
  }
}

Restart Claude Desktop. The server auto-provisions a free-tier key on first use — no signup required.

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Tools

sentrul_research

Fetch a URL and run Sentrul's research-agent on the content. Returns summary, entities, claims, and a public Langfuse trace URL.

Example prompts

• "Research https://example.com/report and summarise the key claims"
• "Do a full-depth research pass on https://arxiv.org/abs/2401.00001"

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sentrul_compliance_scan

Scan text for common compliance patterns (PII, PCI, HIPAA, GDPR data). Returns findings + severity. Not legal advice.

Example prompts

• "Scan this document for PII and PCI violations: [paste text]"
• "Check the following privacy policy for GDPR data patterns"

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sentrul_trace_lookup

Retrieve a public Langfuse trace by ID. Returns the structured trace payload for inspection.

Example prompts

• "Fetch trace clm8abc123xyz from Sentrul"
• "Show me the observation tree for trace ID abc-def-456"

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Environment variables

Variable	Required	Default	Description
SENTRUL_API_KEY	No	auto-provisioned	Your Sentrul API key. Leave unset to use the free tier.
SENTRUL_API_BASE	No	https://app.sentrul.com/api	Override the Sentrul gateway base URL (staging / local dev).

Anonymous free tier

If SENTRUL_API_KEY is not set, the server:

1. Checks for a cached key at ~/.sentrul/mcp-key.
2. If no cache exists, calls POST /v1/mcp/keys/anonymous to auto-provision a rate-limited free key.
3. Writes the key to ~/.sentrul/mcp-key (mode 0600) for future runs.

You can upgrade at any time by setting SENTRUL_API_KEY in your MCP client config.

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Security notes

• No shell execution — the server never runs shell commands or spawns subprocesses.
• No PII logging — environment variables and API keys are never written to logs or stdout.
• Read-only — all three tools are read-only at launch; no writes to user files or external state.
• Filesystem writes — the only writes are to ~/.sentrul/mcp-key (the key cache). Nothing else is written outside that directory.
• Supply-chain — publish uses 2FA-enforced npm account + sigstore attestation (see SECURITY.md when available).

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Development

pnpm install
pnpm run build   # tsc → dist/
pnpm test        # vitest run

# Smoke test — should print 3 tools in the tools/list response:
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | node dist/index.js

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Links

• Homepage: https://sentrul.com
• Repository: https://github.com/sentrul/sentrul-mcp-server
• Issues: https://github.com/sentrul/sentrul-mcp-server/issues

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MIT License — Copyright (c) 2026 Sentrul