Threat Modeler

DevOps & Security

threat-modeler

Threat Modeler is an Agent Skill for devops & security published in the a5c-ai/babysitter repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Generate threat models using STRIDE, PASTA, or VAST methodologies

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How to use this skill

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Prompt to paste

Inspect the Agent Skill at https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/software-architecture/skills/threat-modeler/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/threat-modeler, but wait for my approval before writing files or running scripts.

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Threat Modeler Skill

Overview

Generates threat models using STRIDE, PASTA, or VAST methodologies with attack tree generation, data flow diagram analysis, and threat prioritization using DREAD.

Capabilities

Generate STRIDE threat models
PASTA methodology support
VAST methodology support
Attack tree generation
Data flow diagram analysis
Threat prioritization (DREAD)
Microsoft Threat Modeling Tool integration
Mitigation recommendations

Target Processes

security-architecture-review
api-design-specification

Input Schema

{
  "type": "object",
  "required": ["system"],
  "properties": {
    "system": {
      "type": "object",
      "properties": {
        "name": { "type": "string" },
        "description": { "type": "string" },
        "dataFlows": { "type": "array" },
        "assets": { "type": "array" },
        "trustBoundaries": { "type": "array" },
        "externalEntities": { "type": "array" }
      }
    },
    "methodology": {
      "type": "string",
      "enum": ["STRIDE", "PASTA", "VAST"],
      "default": "STRIDE"
    },
    "options": {
      "type": "object",
      "properties": {
        "prioritization": {
          "type": "string",
          "enum": ["DREAD", "CVSS", "custom"],
          "default": "DREAD"
        },
        "generateAttackTrees": {
          "type": "boolean",
          "default": true
        },
        "outputFormat": {
          "type": "string",
          "enum": ["json", "markdown", "html"],
          "default": "markdown"
        }
      }
    }
  }
}

Output Schema

{
  "type": "object",
  "properties": {
    "threats": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": { "type": "string" },
          "category": { "type": "string" },
          "title": { "type": "string" },
          "description": { "type": "string" },
          "affectedAssets": { "type": "array" },
          "riskScore": { "type": "number" },
          "mitigations": { "type": "array" }
        }
      }
    },
    "attackTrees": {
      "type": "array"
    },
    "dataFlowDiagram": {
      "type": "string",
      "description": "DFD in specified format"
    },
    "summary": {
      "type": "object",
      "properties": {
        "totalThreats": { "type": "number" },
        "byCategory": { "type": "object" },
        "bySeverity": { "type": "object" }
      }
    }
  }
}

Usage Example

{
  kind: 'skill',
  skill: {
    name: 'threat-modeler',
    context: {
      system: {
        name: 'E-Commerce Platform',
        assets: ['User Data', 'Payment Info', 'Inventory'],
        trustBoundaries: ['DMZ', 'Internal Network'],
        dataFlows: [
          { from: 'User', to: 'Web Server', data: 'Credentials' }
        ]
      },
      methodology: 'STRIDE',
      options: {
        prioritization: 'DREAD',
        generateAttackTrees: true
      }
    }
  }
}