Aegis vs Assay

In-depth architectural comparison of the Aegis and Assay 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 Aegis 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).
• Primary tools included: AES-256-GCM encrypted credential vault, Transparent HTTP proxy with credential injection, Agent authentication and scoped credential grants.

Explore Aegis Details

Choose Assay 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).
• 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.

Feature & Specification Comparison

Specification	Aegis getaegis Security	Assay Rul1an Security
Summary	Credential isolation proxy for AI agents. Injects secrets at the network boundary with domain restrictions, agent authentication, and audit logging. No SDK required — works as a transparent HTTP proxy or MCP server.	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.
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": {
    "getaegis-aegis": {
      "command": "npx",
      "args": [
        "slack-mcp-server"
      ]
    }
  }
}

{
  "mcpServers": {
    "rul1an-assay": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem"
      ]
    }
  }
}

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