Kastell MCP Server

Your infrastructure, fortified. Server security is fragmented. Lynis scans but doesn't fix. OpenSCAP is powerful but complex. Custom scripts work until they don't -- and nobody maintains them. Each tool has its own output format, its own update cycle, its own learning curve. It runs locally over stdio via the published package.

People connecting cloud infrastructure tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-16 · ★ 57 · #20 OF 141 MAINTAINED CLOUD INFRASTRUCTURE · VERIFIED 2026-08-25

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Kastell

before you install - you'll need

Set HETZNER_TOKEN, DIGITALOCEAN_TOKEN, VULTR_TOKEN, LINODE_TOKEN before connecting.

Claude Code

claude mcp add kastelldev-kastell -- npx -y kastell

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "kastelldev-kastell": {
      "command": "npx",
      "args": [
        "-y",
        "kastell"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

npm package kastell - unscoped; check the name against the project README before installing

registry namespace io.github.kastelldev is GitHub-verified and matches the repo owner

03 · What Kastell can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v2.3.1 · 2026-06-30

Security · Logger BEARER token redaction hardened - word-boundary matching, 20+ char length floor, provider-pattern dedup; WHOLE vs SUBSTRING pattern split for provider tokens vs API tokens (src/utils/logger.ts)…

v2.3.0 · 2026-06-12

Added · markCommandFailed() exit code helper - src/utils/exitCode.ts centralizes process.exitCode = 1 signaling; adopted across snapshot, domain, maintain, update, audit, evidence, fix, init commands (P141)…

v2.2.7 · 2026-05-16

Fixed · npm tarball plugin.json version sync - v2.2.6 npm tarball shipped with package.json 2.2.6 but .claude-plugin/plugin.json stuck at 2.2.5; CC marketplace /plugin update showed correct version on disk but plugin…

04 · Who maintains Kastell

kastell is maintained by kastelldev. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/kastelldev/kastell
category: cloud infrastructure - ranked #20 of 141 actively-maintained cloud infrastructure servers as of 2026-08-25.
release cadence: 2 releases in the last 90 days (latest 2026-06-30)
registry: io.github.kastelldev/kastell (active, first published 2026-03-24)
packages: npm:kastell

06 · Kastell FAQ

What is Kastell?

Is Kastell still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-16 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Kastell?

Run `npx -y kastell`. The README documents 4 environment variables (HETZNER_TOKEN, DIGITALOCEAN_TOKEN, VULTR_TOKEN…) to set first. Set HETZNER_TOKEN, DIGITALOCEAN_TOKEN, VULTR_TOKEN, LINODE_TOKEN before connecting. You can also paste the ready-made client config above.

Does Kastell run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Kastell

Alternatives to Kastell

Maintained cloud infrastructure servers if Kastell isn't the fit.

Pairs well with

Servers that cover what Kastell doesn't - only shown when the pairing reason fits the companion.

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