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@dollhousemcp/mcp-server

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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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/** * Autonomy Evaluator Service * * Determines whether an agent should continue autonomously or pause * for human input after each step. This is the brain that enables * automatic continue/pause decisions in the agentic loop. * * Decision factors: * 1. Step count vs maxAutonomousSteps * 2. Next action vs requiresApproval patterns * 3. Safety tier (ALLOW/VERIFY/DENY) * 4. Risk tolerance configuration * * ## Danger Zone Verification Flow (Issue #142) * * When an agent action triggers the DANGER_ZONE or VERIFY safety tier, * a human-in-the-loop verification is required before the agent can proceed. * * End-to-end sequence: * * 1. Agent proposes an action (nextActionHint) during agentic loop * 2. evaluateAutonomy() calls checkSafetyTier() → returns DANGER_ZONE or VERIFY * 3. createVerificationChallenge() generates a challenge with: * - challengeId (UUID v4 via crypto.randomUUID) * - displayCode (human-readable code, e.g. "ABC123") * - expiresAt (configurable, default 5 minutes) * 4. storeAndDisplayChallenge(): * a. Stores {code, expiresAt, reason} in VerificationStore (server-side, one-time use) * b. Shows displayCode to human via OS-native dialog (AppleScript/zenity/PowerShell) * c. displayCode is NEVER included in the LLM-facing directive * 5. For DANGER_ZONE: DangerZoneEnforcer.block() programmatically blocks the agent * with verificationId=challengeId (file-backed, survives restarts) * 6. LLM receives directive with verification.verificationId but NO displayCode * plus actionable guidance: "Use verify_challenge { challenge_id, code }" * 7. Human reads code from OS dialog, tells LLM * 8. LLM calls verify_challenge MCP-AQL operation * 9. MCPAQLHandler verify handler: * a. Validates UUID v4 format (rejects invalid IDs before store lookup) * b. Checks rate limit (max 10 failures per 60s sliding window) * c. Distinguishes expired (VERIFICATION_EXPIRED) from wrong code (VERIFICATION_FAILED) * d. On success: finds blocked agent by challengeId → DangerZoneEnforcer.unblock() * e. Logs granular security events at each stage * 10. Agent retries the operation → passes (no longer blocked) * * Security invariants: * - displayCode never reaches the LLM (stripped before directive is built) * - Codes are one-time use (VerificationStore deletes after any verify attempt) * - Expired challenges are rejected with distinct VERIFICATION_EXPIRED events * - Challenge IDs are validated as UUID v4 before store lookup (anti-enumeration) * - Failed attempts are rate-limited globally (anti-brute-force) * - All verification events are logged with granular types for monitoring * * Part of the Agentic Loop Completion (Epic #380). * * @since v2.0.0 */ import { logger } from '../../utils/logger.js'; import { SecurityMonitor } from '../../security/securityMonitor.js'; import { matchesPattern } from '../../utils/patternMatcher.js'; import { determineSafetyTier, createVerificationChallenge, DEFAULT_SAFETY_CONFIG, showVerificationDialog, } from './safetyTierService.js'; import { getAutonomyRiskThresholds, getAutonomyMaxStepsDefault, } from '../../config/autonomy-config.js'; /** * Default autonomy configuration * * Used when an agent doesn't specify autonomy settings. * Conservative defaults prioritize safety over speed. * * Note: maxAutonomousSteps uses a getter to support env-var overrides * (Issue #390). The static value here serves as the baseline; callers * should prefer mergeWithDefaults() which reads the live config. */ export const DEFAULT_AUTONOMY_CONFIG = { riskTolerance: 'moderate', maxAutonomousSteps: 10, requiresApproval: [], autoApprove: [], verificationTimeoutMinutes: 5, }; /** * Lightweight in-memory tracker for autonomy evaluation patterns. * Issue #391: Provides observability into agent continue/pause decisions. */ class AutonomyMetricsTracker { _totalEvaluations = 0; _continueCount = 0; _pauseCount = 0; _pauseReasons = {}; _dangerZoneTriggered = 0; _verificationRequired = 0; _pauseStepCounts = []; static MAX_STEP_COUNTS = 1000; static LOG_INTERVAL = 50; recordContinue() { this._totalEvaluations++; this._continueCount++; this.maybeLogSnapshot(); } recordPause(reason, stepCount) { this._totalEvaluations++; this._pauseCount++; this._pauseReasons[reason] = (this._pauseReasons[reason] || 0) + 1; this._pauseStepCounts.push(stepCount); if (this._pauseStepCounts.length > AutonomyMetricsTracker.MAX_STEP_COUNTS) { this._pauseStepCounts.shift(); } this.maybeLogSnapshot(); } recordDangerZone() { this._dangerZoneTriggered++; } recordVerification() { this._verificationRequired++; } getSnapshot() { const avgStepCount = this._pauseStepCounts.length > 0 ? Math.round(this._pauseStepCounts.reduce((a, b) => a + b, 0) / this._pauseStepCounts.length) : 0; return { totalEvaluations: this._totalEvaluations, continueCount: this._continueCount, pauseCount: this._pauseCount, pauseReasons: { ...this._pauseReasons }, dangerZoneTriggered: this._dangerZoneTriggered, verificationRequired: this._verificationRequired, averageStepCountAtPause: avgStepCount, }; } /** Reset (for testing). */ reset() { this._totalEvaluations = 0; this._continueCount = 0; this._pauseCount = 0; this._pauseReasons = {}; this._dangerZoneTriggered = 0; this._verificationRequired = 0; this._pauseStepCounts = []; } maybeLogSnapshot() { if (this._totalEvaluations > 0 && this._totalEvaluations % AutonomyMetricsTracker.LOG_INTERVAL === 0) { logger.info('Autonomy evaluation metrics snapshot', { ...this.getSnapshot(), }); } } } /** Module-level metrics instance (Issue #391) */ const autonomyMetrics = new AutonomyMetricsTracker(); /** * Get the current autonomy evaluation metrics snapshot. * Issue #391: Programmatic access for monitoring/diagnostics. */ export function getAutonomyMetrics() { return autonomyMetrics.getSnapshot(); } /** * Reset autonomy metrics (for testing only). * @internal */ export function resetAutonomyMetrics() { autonomyMetrics.reset(); } /** * Sanitize a risk score to a valid 0-100 number. * * Handles NaN, non-number types, Infinity, and out-of-range values with * appropriate warning logs. Always returns a concrete number in [0, 100] * suitable for threshold comparison and safety tier evaluation. * * @param score - The raw risk score to sanitize (may be any numeric edge case) * @param agentName - Agent name for contextual log messages * @returns A clamped, finite number in the range [0, 100] */ function sanitizeRiskScore(score, agentName) { if (typeof score !== 'number' || Number.isNaN(score)) { logger.warn('Invalid risk score (NaN or non-number), treating as 0', { originalScore: score, agentName, }); return 0; } if (!Number.isFinite(score)) { logger.warn('Infinite risk score, clamping to range boundary', { originalScore: score, agentName, }); return score > 0 ? 100 : 0; } if (score < 0 || score > 100) { logger.warn('Risk score out of range, clamping to 0-100', { originalScore: score, agentName, }); return Math.max(0, Math.min(100, score)); } return score; } /** * Store a verification code server-side and show it to the human via OS dialog. * The display code is intentionally NOT returned to the LLM. * * Issue #142: Danger zone verification flow */ function storeAndDisplayChallenge(challenge, context) { if (!challenge.displayCode) return; // Store server-side for later verification if (context.verificationStore) { context.verificationStore.set(challenge.challengeId, { code: challenge.displayCode, expiresAt: new Date(challenge.expiresAt).getTime(), reason: challenge.reason, }); } // Show to human via OS-native dialog (fire-and-forget, non-blocking for evaluation) try { showVerificationDialog(challenge.displayCode, challenge.reason, { title: 'DollhouseMCP - Verification Required', icon: 'warning' }); } catch (error) { logger.warn('Failed to show verification dialog', { error: error instanceof Error ? error.message : String(error), challengeId: challenge.challengeId, }); } } /** * Evaluate whether an agent should continue autonomously or pause * * This is the main entry point for autonomy decisions. Call this after * each step to determine if the LLM can proceed or must wait for * human approval. * * @param context - The autonomy evaluation context * @returns AutonomyDirective indicating continue or pause */ export function evaluateAutonomy(context) { const config = mergeWithDefaults(context.autonomyConfig); const factors = []; logger.debug('Evaluating autonomy', { agentName: context.agentName, stepCount: context.stepCount, outcome: context.currentStepOutcome, nextActionHint: context.nextActionHint, }); // Early validation: sanitize risk score before any checks consume it if (context.riskScore !== undefined) { context.riskScore = sanitizeRiskScore(context.riskScore, context.agentName); } // Check 1: Step count limit const stepLimitResult = checkStepLimit(context.stepCount, config.maxAutonomousSteps); if (stepLimitResult) { factors.push(stepLimitResult.factor); if (!stepLimitResult.continue) { autonomyMetrics.recordPause(stepLimitResult.reason || 'step_limit', context.stepCount); return buildDirective(false, stepLimitResult.reason, factors, { stepsRemaining: 0, }); } } // Check 2: Current step outcome if (context.currentStepOutcome === 'failure') { factors.push('Previous step failed'); autonomyMetrics.recordPause('Previous step failed - human review recommended', context.stepCount); return buildDirective(false, 'Previous step failed - human review recommended', factors); } // Check 3: Pattern matching for next action if (context.nextActionHint) { const patternResult = checkActionPatterns(context.nextActionHint, config.requiresApproval, config.autoApprove); factors.push(...patternResult.factors); if (!patternResult.continue) { autonomyMetrics.recordPause(patternResult.reason || 'pattern_match', context.stepCount); return buildDirective(false, patternResult.reason, factors); } } // Check 4: Safety tier evaluation if (context.nextActionHint || context.riskScore !== undefined) { const safetyResult = checkSafetyTier(context.nextActionHint || context.currentStepDescription, context.riskScore || 0, config.riskTolerance, config.verificationTimeoutMinutes); factors.push(...safetyResult.factors); if (safetyResult.stopped) { // Issue #142: Create verification challenge for danger zone unblocking const dzChallenge = createVerificationChallenge(`Danger zone verification: ${(context.nextActionHint || context.currentStepDescription).substring(0, 100)}`, 'display_code', config.verificationTimeoutMinutes); // Store the code server-side and show via OS dialog (Issue #142) storeAndDisplayChallenge(dzChallenge, context); // Programmatic enforcement: block the agent from further execution // This prevents a compromised LLM from ignoring the danger zone warning // Issue #402: Use DI-injected enforcer instead of singleton context.dangerZoneEnforcer?.block(context.agentName, safetyResult.reason || 'Danger zone operation detected', safetyResult.factors, dzChallenge.challengeId, { stepNumber: context.stepCount, currentStepDescription: context.currentStepDescription, currentStepOutcome: context.currentStepOutcome, nextActionHint: context.nextActionHint, riskScore: context.riskScore, goalDescription: context.goalDescription, goalId: context.goalId, safetyFactors: factors, }); SecurityMonitor.logSecurityEvent({ type: 'DANGER_ZONE_TRIGGERED', severity: 'HIGH', source: 'AutonomyEvaluator.evaluateAutonomy', details: `Agent '${context.agentName}' blocked: danger zone verification required — ${safetyResult.reason ?? 'danger zone operation detected'}`, additionalData: { agentName: context.agentName, factors, nextActionHint: context.nextActionHint, stepCount: context.stepCount, riskScore: context.riskScore, currentStepDescription: context.currentStepDescription, goalDescription: context.goalDescription?.substring(0, 200), challengeId: dzChallenge.challengeId, }, }); autonomyMetrics.recordPause(safetyResult.reason || 'danger_zone', context.stepCount); autonomyMetrics.recordDangerZone(); autonomyMetrics.recordVerification(); return buildDirective(false, safetyResult.reason, factors, { stopped: true, nextStepRisk: 'danger_zone', // Issue #142: Include verification info (without displayCode) so LLM knows how to unblock verification: { verificationId: dzChallenge.challengeId, prompt: dzChallenge.prompt, // displayCode intentionally omitted — shown via OS dialog only challengeType: dzChallenge.challengeType, expiresAt: dzChallenge.expiresAt, }, }); } if (safetyResult.verification) { // Issue #142: Store code server-side, show via OS dialog, strip displayCode storeAndDisplayChallenge({ challengeId: safetyResult.verification.verificationId, displayCode: safetyResult.verification.displayCode, reason: `Verify action: ${(context.nextActionHint || context.currentStepDescription).substring(0, 100)}`, expiresAt: safetyResult.verification.expiresAt, }, context); autonomyMetrics.recordPause(safetyResult.reason || 'verification_required', context.stepCount); autonomyMetrics.recordVerification(); return buildDirective(false, safetyResult.reason, factors, { verification: { verificationId: safetyResult.verification.verificationId, prompt: safetyResult.verification.prompt, // displayCode intentionally omitted — shown via OS dialog only (Issue #142) challengeType: safetyResult.verification.challengeType, expiresAt: safetyResult.verification.expiresAt, }, nextStepRisk: safetyResult.tier, }); } if (!safetyResult.continue) { autonomyMetrics.recordPause(safetyResult.reason || 'safety_tier', context.stepCount); return buildDirective(false, safetyResult.reason, factors, { nextStepRisk: safetyResult.tier, }); } } // Check 5: Risk score vs tolerance threshold if (context.riskScore !== undefined) { const thresholdResult = checkRiskThreshold(context.riskScore, config.riskTolerance); factors.push(thresholdResult.factor); if (!thresholdResult.continue) { autonomyMetrics.recordPause(thresholdResult.reason || 'risk_threshold', context.stepCount); return buildDirective(false, thresholdResult.reason, factors); } } // All checks passed - continue autonomously const stepsRemaining = config.maxAutonomousSteps > 0 ? config.maxAutonomousSteps - context.stepCount - 1 : undefined; factors.push('All autonomy checks passed'); logger.debug('Autonomy evaluation complete: continue', { agentName: context.agentName, stepsRemaining, factors, }); // Issue #391: Record metrics for continue outcome autonomyMetrics.recordContinue(); return buildDirective(true, undefined, factors, { stepsRemaining }); } /** * Check if step count has reached the maximum allowed autonomous steps. * * @param stepCount - Current zero-based step index * @param maxSteps - Maximum autonomous steps allowed (0 = unlimited) * @returns StepLimitResult with continue/pause decision and descriptive factor, * or null if maxSteps is 0 (unlimited) — though in practice always returns a result */ function checkStepLimit(stepCount, maxSteps) { if (maxSteps === 0) { return { continue: true, factor: 'Unlimited autonomous steps configured' }; } if (stepCount >= maxSteps) { return { continue: false, reason: `Maximum autonomous steps reached (${maxSteps})`, factor: `Step ${stepCount + 1} exceeds maxAutonomousSteps=${maxSteps}`, }; } return { continue: true, factor: `Step ${stepCount + 1} of ${maxSteps} autonomous steps`, }; } /** * Check an action string against requiresApproval and autoApprove glob patterns. * * requiresApproval patterns take precedence over autoApprove patterns. * If no pattern matches, the action is allowed by default. * * @param action - The proposed next action string (e.g. "delete user data") * @param requiresApproval - Glob patterns that force a pause (e.g. ["*delete*"]) * @param autoApprove - Glob patterns that explicitly allow continuation (e.g. ["read*"]) * @returns ActionPatternResult with continue/pause decision and matching factor strings */ function checkActionPatterns(action, requiresApproval, autoApprove) { const factors = []; const actionLower = action.toLowerCase(); // requiresApproval takes precedence for (const pattern of requiresApproval) { if (matchesPattern(actionLower, pattern)) { factors.push(`Action matches requiresApproval pattern: ${pattern}`); return { continue: false, reason: `Action requires approval: matches pattern "${pattern}"`, factors, }; } } // Check autoApprove patterns for (const pattern of autoApprove) { if (matchesPattern(actionLower, pattern)) { factors.push(`Action matches autoApprove pattern: ${pattern}`); return { continue: true, factors }; } } factors.push('No pattern match - using default behavior'); return { continue: true, factors }; } // matchesPattern is imported from '../../utils/patternMatcher.js' /** * Evaluate the safety tier for a proposed action and determine if it can proceed. * * Calls `determineSafetyTier()` from the safety package and maps the result * to a continue/pause decision. Tiers escalate: advisory → confirm → verify → danger_zone. * * Issue #389: Wraps determineSafetyTier() in try-catch. If the safety package throws, * logs the error and returns a conservative "pause" result (fail-safe: if we can't * evaluate safety, don't continue). * * @param action - Description of the proposed next action * @param riskScore - Numeric risk score (0-100, already sanitized) * @param riskTolerance - Agent's risk tolerance level ("conservative" | "moderate" | "aggressive") * @param verificationTimeoutMinutes - Expiry time for verification challenges (default: 5) * @returns SafetyTierResult with continue/pause decision, tier info, and optional verification challenge */ function checkSafetyTier(action, riskScore, riskTolerance, verificationTimeoutMinutes = 5) { const factors = []; // Determine safety tier (Issue #389: fail-safe on errors) let tierResult; try { tierResult = determineSafetyTier(riskScore, [], // No security warnings for step evaluation action, DEFAULT_SAFETY_CONFIG); } catch (error) { const errorMsg = error instanceof Error ? error.message : String(error); logger.error('Safety tier evaluation failed — returning conservative pause', { error: errorMsg, action: action.substring(0, 200), riskScore, riskTolerance, }); SecurityMonitor.logSecurityEvent({ type: 'SAFETY_EVALUATION_FAILURE', severity: 'HIGH', source: 'AutonomyEvaluator.checkSafetyTier', details: `determineSafetyTier() threw: ${errorMsg}`, additionalData: { action: action.substring(0, 200), riskScore, riskTolerance }, }); factors.push(`Safety tier evaluation failed: ${errorMsg}`); return { continue: false, reason: 'Safety evaluation failed — pausing for human review', factors, }; } factors.push(`Safety tier: ${tierResult.tier}`); factors.push(...tierResult.factors.map((f) => ` - ${f}`)); switch (tierResult.tier) { case 'advisory': return { continue: true, factors, tier: 'advisory' }; case 'confirm': // For moderate+ tolerance, auto-approve confirm tier if (riskTolerance === 'aggressive') { factors.push('Aggressive risk tolerance: auto-approving CONFIRM tier'); return { continue: true, factors, tier: 'confirm' }; } return { continue: false, reason: 'Action requires confirmation before proceeding', factors, tier: 'confirm', }; case 'verify': { // Create verification challenge const challenge = createVerificationChallenge(`Verify action: ${action.substring(0, 100)}`, 'display_code', verificationTimeoutMinutes); return { continue: false, reason: 'Action requires verification before proceeding', factors, tier: 'verify', verification: { verificationId: challenge.challengeId, prompt: challenge.prompt, displayCode: challenge.displayCode, challengeType: challenge.challengeType, expiresAt: challenge.expiresAt, }, }; } case 'danger_zone': return { continue: false, reason: 'Action blocked: danger zone operation detected', factors, tier: 'danger_zone', stopped: true, }; default: return { continue: true, factors, tier: tierResult.tier }; } } /** * Check whether a risk score exceeds the threshold for the given tolerance level. * * Uses strict greater-than comparison: a score equal to the threshold is allowed. * Issue #390: Thresholds are now configurable via environment variables. * * @param riskScore - Numeric risk score (0-100, already sanitized) * @param riskTolerance - Agent's risk tolerance level ("conservative" | "moderate" | "aggressive") * @returns RiskThresholdResult with continue/pause decision and descriptive factor */ function checkRiskThreshold(riskScore, riskTolerance) { const thresholds = getAutonomyRiskThresholds(); const threshold = thresholds[riskTolerance] ?? thresholds.moderate; if (riskScore > threshold) { return { continue: false, reason: `Risk score (${riskScore}) exceeds ${riskTolerance} threshold (${threshold})`, factor: `Risk ${riskScore} > threshold ${threshold} for ${riskTolerance} tolerance`, }; } return { continue: true, factor: `Risk ${riskScore} within ${riskTolerance} threshold (${threshold})`, }; } /** * Merge a partial user-provided autonomy config with defaults. * * Missing fields fall back to DEFAULT_AUTONOMY_CONFIG values, except * maxAutonomousSteps which reads the env-configurable default (Issue #390). * * @param config - Optional partial autonomy config from the agent definition * @returns Fully populated config with all fields guaranteed present */ function mergeWithDefaults(config) { return { riskTolerance: config?.riskTolerance ?? DEFAULT_AUTONOMY_CONFIG.riskTolerance, maxAutonomousSteps: config?.maxAutonomousSteps ?? getAutonomyMaxStepsDefault(), requiresApproval: config?.requiresApproval ?? DEFAULT_AUTONOMY_CONFIG.requiresApproval, autoApprove: config?.autoApprove ?? DEFAULT_AUTONOMY_CONFIG.autoApprove, verificationTimeoutMinutes: config?.verificationTimeoutMinutes ?? DEFAULT_AUTONOMY_CONFIG.verificationTimeoutMinutes, }; } /** * Build a structured AutonomyDirective from components. * * @param shouldContinue - Whether the agent may continue autonomously * @param reason - Human-readable explanation when paused (undefined when continuing) * @param factors - Array of descriptive strings explaining each check's contribution * @param extras - Optional additional fields (stepsRemaining, stopped, verification, nextStepRisk) * @returns Complete AutonomyDirective ready for the LLM handoff */ function buildDirective(shouldContinue, reason, factors, extras) { return { continue: shouldContinue, reason, factors, ...extras, }; } /** * Quick check if an action would be auto-approved given an autonomy config. * * Utility function for pre-checking actions before execution. * Does NOT evaluate safety tiers or risk scores — only pattern matching. * * @param action - The proposed action string to check * @param config - Optional autonomy config (uses defaults if not provided) * @returns true if the action matches an autoApprove pattern or the agent * uses aggressive tolerance; false if it matches requiresApproval or no match */ export function wouldAutoApprove(action, config) { const mergedConfig = mergeWithDefaults(config); const actionLower = action.toLowerCase(); // Check requiresApproval first (takes precedence) for (const pattern of mergedConfig.requiresApproval) { if (matchesPattern(actionLower, pattern)) { return false; } } // Check autoApprove for (const pattern of mergedConfig.autoApprove) { if (matchesPattern(actionLower, pattern)) { return true; } } // Default behavior depends on risk tolerance return mergedConfig.riskTolerance === 'aggressive'; } //# 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* Autonomy Evaluator Service\n *\n * Determines whether an agent should continue autonomously or pause\n * for human input after each step. This is the brain that enables\n * automatic continue/pause decisions in the agentic loop.\n *\n * Decision factors:\n * 1. Step count vs maxAutonomousSteps\n * 2. Next action vs requiresApproval patterns\n * 3. Safety tier (ALLOW/VERIFY/DENY)\n * 4. Risk tolerance configuration\n *\n * ## Danger Zone Verification Flow (Issue #142)\n *\n * When an agent action triggers the DANGER_ZONE or VERIFY safety tier,\n * a human-in-the-loop verification is required before the agent can proceed.\n *\n * End-to-end sequence:\n *\n *  1. Agent proposes an action (nextActionHint) during agentic loop\n *  2. evaluateAutonomy() calls checkSafetyTier() → returns DANGER_ZONE or VERIFY\n *  3. createVerificationChallenge() generates a challenge with:\n *     - challengeId (UUID v4 via crypto.randomUUID)\n *     - displayCode (human-readable code, e.g. \"ABC123\")\n *     - expiresAt (configurable, default 5 minutes)\n *  4. storeAndDisplayChallenge():\n *     a. Stores {code, expiresAt, reason} in VerificationStore (server-side, one-time use)\n *     b. Shows displayCode to human via OS-native dialog (AppleScript/zenity/PowerShell)\n *     c. displayCode is NEVER included in the LLM-facing directive\n *  5. For DANGER_ZONE: DangerZoneEnforcer.block() programmatically blocks the agent\n *     with verificationId=challengeId (file-backed, survives restarts)\n *  6. LLM receives directive with verification.verificationId but NO displayCode\n *     plus actionable guidance: \"Use verify_challenge { challenge_id, code }\"\n *  7. Human reads code from OS dialog, tells LLM\n *  8. LLM calls verify_challenge MCP-AQL operation\n *  9. MCPAQLHandler verify handler:\n *     a. Validates UUID v4 format (rejects invalid IDs before store lookup)\n *     b. Checks rate limit (max 10 failures per 60s sliding window)\n *     c. Distinguishes expired (VERIFICATION_EXPIRED) from wrong code (VERIFICATION_FAILED)\n *     d. On success: finds blocked agent by challengeId → DangerZoneEnforcer.unblock()\n *     e. Logs granular security events at each stage\n * 10. Agent retries the operation → passes (no longer blocked)\n *\n * Security invariants:\n * - displayCode never reaches the LLM (stripped before directive is built)\n * - Codes are one-time use (VerificationStore del