Seatbelt MCP Server

Block dangerous MCP tool calls at the protocol layer. Scan, proxy, enforce. 🌐 Website: kryptosai.github.io/mcp-seatbelt - demo, comparison, pricing. It runs locally over stdio via the published package.

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

VERIFIED ACTIVE

LAST COMMIT 2026-08-04 · ★ 3 · #51 OF 182 MAINTAINED SECURITY · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install Seatbelt

Claude Code

claude mcp add kryptosai-mcp-seatbelt -- npx -y @kryptosai/mcp-seatbelt

Claude Desktop / Cursor / VS Code - add to config

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

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

repo age created 2026-07-08 - young repo, little track record yet

license MIT - declared in the repository

npm package @kryptosai/mcp-seatbelt - published under the repo owner's npm scope (@kryptosai)

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

03 · What Seatbelt can do

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

Latest releases

v0.5.0 · 2026-07-24

v0.5.0 - 8 Cybersecurity Capabilities + Performance Optimization · New in this release · 8 cybersecurity capabilities: RBAC, Threat Intel, Attack Chains, OWASP mapping, Compliance tagging, Honeytokens, Forensic…

v0.4.0 · 2026-07-19

v0.4.0 - Defense-in-Depth for MCP Runtime Security · Eight new cybersecurity capabilities integrated into mcp-seatbelt: · Per-agent access control with casbin (admin/agent roles, wildcard permissions) · Threat Intel…

04 · Who maintains Seatbelt

mcp-seatbelt is maintained by kryptosai. We track 3 MCP servers from kryptosai - 3 actively maintained, 178 combined GitHub stars, oldest repo from Mar 2026. Full record: all servers from kryptosai.

mcp-observatory MCP security scanner. CI-native testing, attack simulation, health scoring, and SARIF. ★ 174

05 · Facts

repository: github.com/kryptosai/mcp-seatbelt
category: security - ranked #51 of 182 actively-maintained security servers as of 2026-08-25.
release cadence: 2 releases in the last 90 days (latest 2026-07-24)
registry: io.github.KryptosAI/mcp-seatbelt (active, first published 2026-08-04)
packages: npm:@kryptosai/mcp-seatbelt

06 · Seatbelt FAQ

What is Seatbelt?

Is Seatbelt still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-04 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Seatbelt?

Run `npx -y @kryptosai/mcp-seatbelt`. You can also paste the ready-made client config above.

Does Seatbelt 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 Seatbelt

Alternatives to Seatbelt

Maintained security servers if Seatbelt isn't the fit.

Pairs well with

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

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