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DollhouseMCP - A Model Context Protocol (MCP) server that enables dynamic AI persona management from markdown files, allowing Claude and other compatible AI assistants to activate and switch between different behavioral personas.

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/** * Permission evaluation for PreToolUse hooks across all AI platforms. * * Provides the `evaluate_permission` MCP-AQL READ operation, enabling * Claude Code, Cursor, Gemini CLI, Windsurf, and Codex to use * DollhouseMCP as their permission evaluation backend via hooks. * * Three-stage evaluation pipeline: * 1. Rate limiting — prevents abuse * 2. Static tool classification — built-in allow/deny rules * 3. Element policy evaluation — active element gatekeeper policies * * Returns platform-specific response formats so each platform's hook * script receives the JSON shape it expects. */ /** Error thrown when permission evaluation fails at a specific stage */ export class PermissionEvaluationError extends Error { stage; toolName; constructor(message, stage, toolName, cause) { super(message, cause ? { cause } : undefined); this.name = 'PermissionEvaluationError'; this.stage = stage; this.toolName = toolName; } } /** Optional reason field, only included when reason is provided */ function withReason(obj, reason, key = 'reason') { return reason ? { ...obj, [key]: reason } : obj; } /** Gemini: maps 'ask' to 'deny' (no interactive support) */ function formatGemini(decision, reason) { return withReason({ decision: decision === 'ask' ? 'deny' : decision }, reason); } /** Cursor: uses 'permission' field instead of 'decision' */ function formatCursor(decision, reason) { return withReason({ permission: decision }, reason); } /** Windsurf: uses boolean 'allowed' field */ function formatWindsurf(decision, reason) { return withReason({ allowed: decision === 'allow' }, reason); } /** Codex PreToolUse currently supports block/deny only; allow is empty stdout. */ function formatCodex(decision, reason) { if (decision === 'allow') { return {}; } return { hookSpecificOutput: { hookEventName: 'PreToolUse', permissionDecision: decision === 'ask' ? 'deny' : decision, ...(reason ? { permissionDecisionReason: reason } : {}), }, }; } /** Claude Code (default): uses hookSpecificOutput.permissionDecision for PreToolUse */ function formatClaudeCode(decision, reason) { return { hookSpecificOutput: withReason({ hookEventName: 'PreToolUse', permissionDecision: decision, }, reason, 'permissionDecisionReason'), }; } /** Platform formatter lookup */ const platformFormatters = { gemini: formatGemini, cursor: formatCursor, windsurf: formatWindsurf, codex: formatCodex, vscode: formatClaudeCode, claude_code: formatClaudeCode, }; /** Known platform identifiers */ export const SUPPORTED_PLATFORMS = Object.keys(platformFormatters); function warnOnUnknownPlatform(platform) { void import('../../utils/logger.js') .then(({ logger }) => { logger.warn(`[evaluatePermission] Unknown platform "${platform}", defaulting to claude_code format. Supported: ${SUPPORTED_PLATFORMS.join(', ')}`); }) .catch((error) => { console.warn(`[evaluatePermission] Failed to load logger while handling unknown platform "${platform}".`, error); }); } /** * Format permission evaluation response for platform-specific hook scripts. * Each platform expects a different JSON shape from its hook response. * * Unknown platforms default to claude_code format with a warning log. */ export function formatPermissionResponse(decision, platform, _input, reason) { switch (platform) { case 'gemini': return formatGemini(decision, reason); case 'cursor': return formatCursor(decision, reason); case 'windsurf': return formatWindsurf(decision, reason); case 'codex': return formatCodex(decision, reason); case 'claude_code': return formatClaudeCode(decision, reason); default: // Import lazily to avoid circular dependency at module load time warnOnUnknownPlatform(platform); return formatClaudeCode(decision, reason); } } /** * Evaluate a CLI permission request for PreToolUse hooks. * * @param params - Tool name, input, and target platform * @param deps - Injected dependencies from MCPAQLHandler * @returns Platform-formatted permission decision */ export async function evaluatePermission(params, deps) { const toolName = typeof params.tool_name === 'string' ? params.tool_name : ''; const inputRaw = params.input; const input = (inputRaw && typeof inputRaw === 'object') ? inputRaw : {}; const platform = typeof params.platform === 'string' ? params.platform : 'claude_code'; const sessionId = typeof params.session_id === 'string' && params.session_id.trim() !== '' ? params.session_id : undefined; // Rate limit const rateStatus = deps.permissionPromptLimiter.checkLimit(); if (!rateStatus.allowed) { return formatPermissionResponse('deny', platform, input, 'Rate limit exceeded'); } deps.permissionPromptLimiter.consumeToken(); // Stage 1: Static classification const classification = deps.classifyTool(toolName, input); if (classification.behavior === 'allow') { return formatPermissionResponse('allow', platform, input); } if (classification.behavior === 'deny') { return formatPermissionResponse('deny', platform, input, classification.reason); } // Stage 2: Element policy evaluation let elements; try { elements = await deps.getActiveElements(sessionId); } catch (err) { throw new PermissionEvaluationError(`Failed to fetch active elements for policy evaluation: ${err instanceof Error ? err.message : String(err)}`, 'element_fetch', toolName, err); } const decision = deps.evaluateCliToolPolicy(toolName, input, elements); if (decision.behavior === 'deny') { return formatPermissionResponse('deny', platform, input, decision.message); } if (decision.behavior === 'confirm') { return formatPermissionResponse('ask', platform, input, decision.message || 'Requires confirmation per element policy'); } // Default: allow return formatPermissionResponse('allow', platform, input); } //# 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* Permission evaluation for PreToolUse hooks across all AI platforms.\n *\n * Provides the `evaluate_permission` MCP-AQL READ operation, enabling\n * Claude Code, Cursor, Gemini CLI, Windsurf, and Codex to use\n * DollhouseMCP as their permission evaluation backend via hooks.\n *\n * Three-stage evaluation pipeline:\n * 1. Rate limiting — prevents abuse\n * 2. Static tool classification — built-in allow/deny rules\n * 3. Element policy evaluation — active element gatekeeper policies\n *\n * Returns platform-specific response formats so each platform's hook\n * script receives the JSON shape it expects.\n */\n\nimport type { RateLimiter } from '../../utils/RateLimiter.js';\nimport type { ToolClassificationResult, CliToolPolicyResult } from './policies/ToolClassification.js';\nimport type { ActiveElement } from './policies/ElementPolicies.js';\n\n/** Error thrown when permission evaluation fails at a specific stage */\nexport class PermissionEvaluationError extends Error {\n  public readonly stage: 'rate_limit' | 'classification' | 'policy' | 'element_fetch';\n  public readonly toolName: string;\n\n  constructor(\n    message: string,\n    stage: 'rate_limit' | 'classification' | 'policy' | 'element_fetch',\n    toolName: string,\n    cause?: unknown,\n  ) {\n    super(message, cause ? { cause } : undefined);\n    this.name = 'PermissionEvaluationError';\n    this.stage = stage;\n    this.toolName = toolName;\n  }\n}\n\n/** Dependencies injected from MCPAQLHandler */\nexport interface EvaluatePermissionDeps {\n  permissionPromptLimiter: RateLimiter;\n  classifyTool: (toolName: string, toolInput: Record<string, unknown>) => ToolClassificationResult;\n  evaluateCliToolPolicy: (toolName: string, toolInput: Record<string, unknown>, elements: ActiveElement[]) => CliToolPolicyResult;\n  getActiveElements: (sessionId?: string) => Promise<ActiveElement[]>;\n}\n\n/** Optional reason field, only included when reason is provided */\nfunction withReason(obj: Record<string, unknown>, reason?: string, key = 'reason'): Record<string, unknown> {\n  return reason ? { ...obj, [key]: reason } : obj;\n}\n\n/** Gemini: maps 'ask' to 'deny' (no interactive support) */\nfunction formatGemini(decision: string, reason?: string): Record<string, unknown> {\n  return withReason({ decision: decision === 'ask' ? 'deny' : decision }, reason);\n}\n\n/** Cursor: uses 'permission' field instead of 'decision' */\nfunction formatCursor(decision: string, reason?: string): Record<string, unknown> {\n  return withReason({ permission: decision }, reason);\n}\n\n/** Windsurf: uses boolean 'allowed' field */\nfunction formatWindsurf(decision: string, reason?: string): Record<string, unknown> {\n  return withReason({ allowed: decision === 'allow' }, reason);\n}\n\n/** Codex PreToolUse currently supports block/deny only; allow is empty stdout. */\nfunction formatCodex(decision: string, reason?: string): Record<string, unknown> {\n  if (decision === 'allow') {\n    return {};\n  }\n\n  return {\n    hookSpecificOutput: {\n      hookEventName: 'PreToolUse',\n      permissionDecision: decision === 'ask' ? 'deny' : decision,\n      ...(reason ? { permissionDecisionReason: reason } : {}),\n    },\n  };\n}\n\n/** Claude Code (default): uses hookSpecificOutput.permissionDecision for PreToolUse */\nfunction formatClaudeCode(decision: string, reason?: string): Record<string, unknown> {\n  return {\n    hookSpecificOutput: withReason({\n      hookEventName: 'PreToolUse',\n      permissionDecision: decision,\n    }, reason, 'permissionDecisionReason'),\n  };\n}\n\n/** Platform formatter lookup */\nconst platformFormatters: Record<string, (decision: string, reason?: string) => Record<string, unknown>> = {\n  gemini: formatGemini,\n  cursor: formatCursor,\n  windsurf: formatWindsurf,\n  codex: formatCodex,\n  vscode: formatClaudeCode,\n  claude_code: formatClaudeCode,\n};\n\n/** Known platform identifiers */\nexport const SUPPORTED_PLATFORMS = Object.keys(platformFormatters);\n\nfunction warnOnUnknownPlatform(platform: string): void {\n  void import('../../utils/logger.js')\n    .then(({ logger }) => {\n      logger.warn(\n        `[evaluatePermission] Unknown platform \"${platform}\", defaulting to claude_code format. Supported: ${SUPPORTED_PLATFORMS.join(', ')}`,\n      );\n    })\n    .catch((error) => {\n      console.warn(\n        `[evaluatePermission] Failed to load logger while handling unknown platform \"${platform}\".`,\n        error,\n      );\n    });\n}\n\n/**\n * Format permission evaluation response for platform-specific hook scripts.\n * Each platform expects a different JSON shape from its hook response.\n *\n * Unknown platforms default to claude_code format with a warning log.\n */\nexport function formatPermissionResponse(\n  decision: 'allow' | 'deny' | 'ask',\n  platform: string,\n  _input: Record<string, unknown>,\n  reason?: string,\n): Record<string, unknown> {\n  switch (platform) {\n    case 'gemini': return formatGemini(decision, reason);\n    case 'cursor': return formatCursor(decision, reason);\n    case 'windsurf': return formatWindsurf(decision, reason);\n    case 'codex': return formatCodex(decision, reason);\n    case 'claude_code': return formatClaudeCode(decision, reason);\n    default:\n      // Import lazily to avoid circular dependency at module load time\n      warnOnUnknownPlatform(platform);\n      return formatClaudeCode(decision, reason);\n  }\n}\n\n/**\n * Evaluate a CLI permission request for PreToolUse hooks.\n *\n * @param params - Tool name, input, and target platform\n * @param deps - Injected dependencies from MCPAQLHandler\n * @returns Platform-formatted permission decision\n */\nexport async function evaluatePermission(\n  params: { tool_name?: unknown; input?: unknown; platform?: unknown; session_id?: unknown },\n  deps: EvaluatePermissionDeps,\n): Promise<Record<string, unknown>> {\n  const toolName = typeof params.tool_name === 'string' ? params.tool_name : '';\n  const inputRaw = params.input;\n  const input = (inputRaw && typeof inputRaw === 'object')\n    ? inputRaw as Record<string, unknown>\n    : {};\n  const platform = typeof params.platform === 'string' ? params.platform : 'claude_code';\n  const sessionId = typeof params.session_id === 'string' && params.session_id.trim() !== ''\n    ? params.session_id\n    : undefined;\n\n  // Rate limit\n  const rateStatus = deps.permissionPromptLimiter.checkLimit();\n  if (!rateStatus.allowed) {\n    return formatPermissionResponse('deny', platform, input, 'Rate limit exceeded');\n  }\n  deps.permissionPromptLimiter.consumeToken();\n\n  // Stage 1: Static classification\n  const classification = deps.classifyTool(toolName, input);\n  if (classification.behavior === 'allow') {\n    return formatPermissionResponse('allow', platform, input);\n  }\n  if (classification.behavior === 'deny') {\n    return formatPermissionResponse('deny', platform, input, classification.reason);\n  }\n\n  // Stage 2: Element policy evaluation\n  let elements: ActiveElement[];\n  try {\n    elements = await deps.getActiveElements(sessionId);\n  } catch (err) {\n    throw new PermissionEvaluationError(\n      `Failed to fetch active elements for policy evaluation: ${err instanceof Error ? err.message : String(err)}`,\n      'element_fetch', toolName, err,\n    );\n  }\n  const decision = deps.evaluateCliToolPolicy(toolName, input, elements);\n\n  if (decision.behavior === 'deny') {\n    return formatPermissionResponse('deny', platform, input, decision.message);\n  }\n  if (decision.behavior === 'confirm') {\n    return formatPermissionResponse('ask', platform, input,\n      decision.message || 'Requires confirmation per element policy');\n  }\n\n  // Default: allow\n  return formatPermissionResponse('allow', platform, input);\n}\n"]}