FaultKey · CausalLayer vs Decide

In-depth architectural comparison of the FaultKey · CausalLayer and Decide 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?

F

Choose FaultKey · CausalLayer when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: submit_incident, verify_certificate, get_anchor_status.

Explore FaultKey · CausalLayer Details

Choose Decide when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Evaluates versioned declarative Rulebook v1 definitions, Returns yes, no, or review decisions with application verdicts, Validates rulebooks against a published JSON Schema.

Explore Decide Details

Feature & Specification Comparison

Specification	F FaultKey · CausalLayer Finance & Fintech	Decide decidefyi Finance & Fintech
Summary	Deterministic AI-liability attribution: signed, Bitcoin-anchored vendor/deployer/user fault split.	Deterministic refund eligibility notary MCP server. Returns ALLOWED / DENIED / UNKNOWN for subscription refunds (Adobe, Spotify, etc.) via a stateless rules engine.
Category & Scope	Finance & Fintech

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": {
    "faultkey-causallayer": {
      "command": "npx",
      "args": [
        "-y",
        "causallayer-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "decidefyi-decide": {
      "command": "npx",
      "args": [
        "-y",
        "vercel"
      ]
    }
  }
}

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