What is the key difference between Lucairn Sdks and Kastell?

Lucairn Sdks belongs to the Security category with local stdio execution, while Kastell belongs to the Security category with local stdio execution.

How do I install Lucairn Sdks or Kastell in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Lucairn Sdks and Kastell free or paid?

Lucairn Sdks operates under a Freemium model (API Key required). Kastell operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Lucairn Sdks lists 6 tools with 3 views and 2 GitHub stars. Kastell lists 6 tools with 2 views and 56 GitHub stars.

Can I use both Lucairn Sdks and Kastell together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install Lucairn Sdks or Kastell in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Lucairn Sdks and Kastell free to use, or do they require API keys?

Lucairn Sdks is listed under a Freemium model with API Key required . Kastell operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Lucairn Sdks and Kastell at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both declade-lucairn-sdks and kastelldev-kastell as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Lucairn Sdks has a Quality Score of 49 /100 ( Fair ) with 3 views, 0 installs, and 2 GitHub stars. Kastell holds a Quality Score of 52 /100 ( Good ) with 2 views, 0 installs, and 56 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Lucairn Sdks vs Kastell

In-depth architectural comparison of the Lucairn Sdks and Kastell MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Lucairn Sdks

Security · Local stdio

Quality: 49/100 (Fair) | Auth: API Key required

Kastell

Security · Local stdio

Quality: 52/100 (Good) | Auth: No auth required

Verdict Summary: Choose Lucairn Sdks if you need specialized Security tools running via a local process. Choose Kastell if your workspace requires Security integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Lucairn Sdks when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Freemium).
You have access to required keys: LUCAIRN_API_KEY, ANTHROPIC_API_KEY, OPENAI_API_KEY.
Primary tools included: Three-layer PII detection including custom and Presidio recognizers, Redacts PII with placeholders before upstream model access, Signed Ed25519 certificates with RFC 3161 timestamp and Sigstore anchoring.

Explore Lucairn Sdks Details

Choose Kastell when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: KASTELL_API_KEY, KASTELL_PROVIDER_TOKEN, KASTELL_SSH_KEY_PATH, KASTELL_CONFIG_PATH.

Feature & Specification Comparison

Specification	Lucairn Sdks Declade Security	Kastell kastelldev Security
Summary	Privacy-preserving AI gateway. Sanitises PII (German + English; Microsoft Presidio + custom recognisers) before prompts reach Anthropic / OpenAI / your LLM, then emits a signed cryptographic certificate per call (Ed25519 + RFC 3161 timestamp + Sigstore Rekor anchoring). EU GDPR + AI Act ready. Free tier 500 calls/month, BYOK. Install: npx -y @lucairn/mcp-server. Docs: https://lucairn.eu/developer/mcp.	Server security auditing and hardening toolkit. 413 security checks across 29 categories (SSH, Firewall, Docker, TLS, HTTP Headers), CIS/PCI-DSS/HIPAA compliance mapping, 19-step production hardening, fleet management, and forensic evidence collection. Supports Hetzner, DigitalOcean, Vultr, and Linode. 13 MCP tools.
Category & Scope

Tools & Capabilities Breakdown

Lucairn Sdks Tools (6)

Three-layer PII detection including custom and Presidio recognizers

Redacts PII with placeholders before upstream model access

Signed Ed25519 certificates with RFC 3161 timestamp and Sigstore anchoring

Supports Anthropic and OpenAI with BYOK API key forwarding

Multi-language SDKs: TypeScript, Python, Go, and MCP server

Free developer tier with 500 calls/month and optional enterprise features

Kastell Tools (6)

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Lucairn Sdks Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "declade-lucairn-sdks": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server"
      ],
      "env": {
        "LUCAIRN_API_KEY": "YOUR_LUCAIRN_API_KEY_HERE",
        "ANTHROPIC_API_KEY": "YOUR_ANTHROPIC_API_KEY_HERE",
        "OPENAI_API_KEY": "YOUR_OPENAI_API_KEY_HERE"
      }
    }
  }
}

Kastell Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "kastelldev-kastell": {
      "command": "npx",
      "args": [
        "-y",
        "kastelldev-kastell"
      ],
      "env": {
        "KASTELL_API_KEY": "YOUR_KASTELL_API_KEY_HERE",
        "KASTELL_PROVIDER_TOKEN": "YOUR_KASTELL_PROVIDER_TOKEN_HERE",
        "KASTELL_SSH_KEY_PATH": "YOUR_KASTELL_SSH_KEY_PATH_HERE",
        "KASTELL_CONFIG_PATH": "YOUR_KASTELL_CONFIG_PATH_HERE"
      }
    }
  }
}

Frequently Asked Questions

Lucairn Sdks is categorized under Security and uses a local stdio subprocess. In contrast, Kastell belongs to Security using local stdio subprocess. Select Lucairn Sdks when you need capabilities focused on security and Kastell when you require tools for security.

More alternatives to Lucairn Sdks More alternatives to Kastell Security category hub