Assay vs Scopeblind Gateway

In-depth architectural comparison of the Assay and Scopeblind Gateway 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.

Which MCP Server Should You Choose?

Choose Assay when:

• You need dedicated capabilities in the Security domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Deterministic, fail-closed policy enforcement for MCP tool calls, Offline-verifiable, tamper-evident evidence bundles of decisions and observations, Kernel-level IPv4/TCP egress enforcement via eBPF/LSM and Landlock on Linux.

Explore Assay Details

Choose Scopeblind Gateway 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: INTERNAL_API_KEY.
• Primary tools included: Per-tool policy enforcement (block, rate limit, min tier), Shadow mode logs all tool calls without blocking, Enforce mode applies policies to tool calls.

Feature & Specification Comparison

Specification	Assay Rul1an Security	Scopeblind Gateway tomjwxf Security
Summary	Policy-as-code gate for MCP. A fail-closed proxy that denies risky tool calls before they run, produces offline-verifiable evidence bundles of what executed, and enforces IPv4/TCP egress in-kernel via eBPF/LSM and Landlock on Linux. Deterministic and offline-first.	Security gateway that wraps any MCP server with per-tool policies, approval gates, and optional Ed25519-signed receipts. Shadow mode logs every tool call; enforce mode blocks, rate-limits, or requires approval.
Category & Scope

Tools & Capabilities Breakdown

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).

{
  "mcpServers": {
    "rul1an-assay": {
      "url": "https://docs.getassay.dev/mcp/protocol-era-parity/"
    }
  }
}

{
  "mcpServers": {
    "tomjwxf-scopeblind-gateway": {
      "command": "npx",
      "args": [
        "-y",
        "@scopeblind/passport"
      ],
      "env": {
        "INTERNAL_API_KEY": "YOUR_INTERNAL_API_KEY_HERE"
      }
    }
  }
}

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