Shield vs Feranor Resilience

In-depth architectural comparison of the Shield and Feranor Resilience 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 Shield 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: Pre-execution MCP call guardrails, TOFU tool-catalog pinning, Tool description and result scanning.

Explore Shield Details

Choose Feranor Resilience when:

• You need dedicated capabilities in the Security domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Freemium).
• Primary tools included: Invisible Unicode and homoglyph detection, Text cleanup with before-and-after risk comparison, Domain scores across TLS, DNS, headers, and speed.

Explore Feranor Resilience Details

Feature & Specification Comparison

Specification	Shield AperionAI Security	Feranor Resilience VerifiedSecurity
Summary	Local guardrail proxy for AI coding agents. Wraps any MCP server (stdio or Streamable HTTP) and blocks destructive tool calls — DROP TABLE, rm -rf, force-push — before they execute. MCP supply-chain protection: TOFU tool-catalog pinning against rug pulls, plus tool-description and tool-result scanning for tool poisoning and prompt injection. 51 starter rules, approval gates, audit logging. Single binary, Apache-2.0.	Scan/purge hidden text & score web domains: TLS, DNS, headers, speed. Free scans, $0.01 actions. The Tools: text_scan_v1 — free Scans a text string for invisible Unicode characters, homoglyphs, and normalization issues. Returns a risk score, a list of flagged characters, and detected homoglyphs. Never modifies the input text. text_purge_v1 — $0.01 per call Removes invisible Unicode characters and replaces homoglyphs in a text string, then normalizes the result. Returns the cleaned text plus a before-and-after risk comparison. domain_check_score_v1 — free Overall score, per-category scores, and how many findings each category raised. Use it to triage: rank a list of domains, confirm one is healthy, or decide whether the full report is worth pulling. It tells you which categories are weak and how many issues they hold, but not what the issues are. domain_check_score_batch_v1 — free The same triage scores for up to 100 domains in a single call. One score summary per distinct domain: overall score, per-category scores, and how many findings each category raised. Never the findings themselves. domain_check_v1 — $0.01 per call Full report for one domain: weighted score out of 100, per-category breakdown, and every individual finding with a prioritised remediation order. domain_check_batch_v1 — from $0.005 per domain The same full report for up to 100 domains in a single call, with one payment for the whole batch instead of one per domain. Both cheaper per domain and much faster than calling domain_check_v1 in a loop.

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": {
    "aperionai-shield": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-postgres"
      ]
    }
  }
}

{
  "mcpServers": {
    "feranor-resilience": {
      "url": "https://www.feranor.com/tools/mcp"
    }
  }
}

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