Imported from personamanagmentlayer/pcl (stdlib/languages/pcl-expert/SKILL.md). Install upstream with npx skills add personamanagmentlayer/pcl --skill pcl-expert. Copyright stays with the author.

PCL Expert

Master expert in Persona Control Language (PCL) - a domain-specific programming language and compiler for AI persona management. Comprehensive expertise in language design, compiler architecture, runtime execution, tooling ecosystem, and standards compliance.

Advanced Features

Adaptive Intelligence (Phase 1.2)

// Learning and optimization systems
interface AdaptiveIntelligence {
  // Memory management
  memory: {
    store: MemoryStorage;
    manager: MemoryManager;
    knowledgeSharing: KnowledgeSharing;
  };

  // Analytics and insights
  analytics: {
    performanceTracker: PerformanceTracker;
    trendAnalyzer: TrendAnalyzer;
    analyticsStore: AnalyticsStore;
  };

  // Intelligent routing
  routing: {
    router: IntelligentRouter;
    taskClassifier: TaskClassifier;
  };

  // Response caching
  cache: {
    responseCache: ResponseCache;
    semanticMatcher: SemanticMatcher;
  };

  // A/B testing
  experiments: {
    manager: ExperimentManager;
    variantSelector: VariantSelector;
    resultsAnalyzer: ResultsAnalyzer;
  };

  // Confidence scoring
  confidence: {
    scorer: ConfidenceScorer;
    signalCollector: SignalCollector;
    calibration: CalibrationEngine;
  };

  // Context management
  context: {
    windowManager: ContextWindowManager;
    deduplication: Deduplication;
    prioritization: Prioritization;
    threading: Threading;
  };

  // Escalation management
  escalation: {
    manager: EscalationManager;
    triggers: EscalationTriggers;
  };

  // Team optimization
  teams: {
    outcomeTracker: OutcomeTracker;
    weightAdapter: WeightAdapter;
  };
}

HTTP Registry Server

// REST API for remote artifact management
class HTTPRegistryServer {
  // Express-based HTTP server
  // OpenAPI/Swagger documentation
  // JWT authentication
  // Rate limiting
  // CORS support
  // Compression (gzip, brotli)
  // Security headers (Helmet)

  routes: {
    // Authentication
    'POST /auth/register': RegisterHandler;
    'POST /auth/login': LoginHandler;
    'POST /auth/refresh': RefreshTokenHandler;
    'POST /auth/logout': LogoutHandler;

    // Artifacts
    'GET /artifacts': ListArtifactsHandler;
    'GET /artifacts/:name': GetArtifactHandler;
    'POST /artifacts': PublishArtifactHandler;
    'PUT /artifacts/:name': UpdateArtifactHandler;
    'DELETE /artifacts/:name': DeleteArtifactHandler;

    // Versions
    'GET /artifacts/:name/versions': ListVersionsHandler;
    'GET /artifacts/:name/versions/:version': GetVersionHandler;

    // Search
    'GET /search': SearchHandler;
    'GET /search/suggestions': SuggestionsHandler;

    // Metrics & Health
    'GET /metrics': MetricsHandler;
    'GET /health': HealthCheckHandler;
    'GET /profiler': ProfilerHandler;
  };
}

CLI Tools

// Command-line interface for PCL development
const cli = {
  // Compilation
  'pcl build': 'Compile PCL to JavaScript/TypeScript',
  'pcl watch': 'Watch mode for development',

  // Execution
  'pcl run': 'Execute a PCL program',
  'pcl repl': 'Interactive REPL',

  // Skills management
  'pcl skills list': 'List installed skills',
  'pcl skills search': 'Search skill registry',
  'pcl skills install': 'Install a skill',
  'pcl skills create': 'Create a new skill',
  'pcl skills publish': 'Publish to registry',
  'pcl skills validate': 'Validate skill format',

  // Registry
  'pcl registry export': 'Export registry',
  'pcl registry import': 'Import registry',
  'pcl registry search': 'Search remote registry',

  // Initialization
  'pcl init': 'Initialize PCL project',
  'pcl completion': 'Shell completion scripts',

  // Language server
  'pcl lsp': 'Start language server',

  // MCP server
  'pcl mcp': 'Start MCP server',

  // HTTP server
  'pcl serve': 'Start HTTP registry server',
};

PCL Language Examples

Basic Persona Declaration

persona TYPESCRIPT_EXPERT {
  description: "Expert in TypeScript development"
  skills: [
    "typescript-advanced",
    "type-system-design",
    "compiler-api",
    "testing-frameworks"
  ]
  provider: "anthropic:claude-3-5-sonnet"
  temperature: 0.7
  maxTokens: 4096
}

Team Composition

team CODE_REVIEW_TEAM {
  description: "Comprehensive code review team"
  personas: [
    TYPESCRIPT_EXPERT,
    SECURITY_EXPERT,
    PERFORMANCE_EXPERT
  ]
  mergeMode: "consensus"
  weights: {
    TYPESCRIPT_EXPERT: 0.5,
    SECURITY_EXPERT: 0.3,
    PERFORMANCE_EXPERT: 0.2
  }
}

Workflow Orchestration

workflow CODE_REVIEW_WORKFLOW {
  description: "Automated code review process"

  step ANALYZE {
    persona: TYPESCRIPT_EXPERT
    input: file("src/components/Button.tsx")
    output: "analysis"
  }

  step SECURITY_CHECK {
    persona: SECURITY_EXPERT
    input: $analysis
    output: "security_report"
  }

  step FINAL_REVIEW {
    team: CODE_REVIEW_TEAM
    input: {
      analysis: $analysis,
      security: $security_report
    }
    output: "final_verdict"
  }
}

Skill Declaration

skill RUST_EXPERT {
  name: "rust-expert"
  version: "1.0.0"
  category: "languages"
  description: "Expert in Rust programming"

  capabilities: [
    "memory-safety",
    "concurrency",
    "zero-cost-abstractions",
    "trait-system"
  ]

  tools: ["Read", "Write", "Execute", "Debug"]
}

Anti-Patterns

❌ Global State

// BAD
let currentPersona: Persona | null = null;

// GOOD
class Parser {
  private currentPersona: Persona | null = null;
}

❌ Throwing Exceptions

// BAD
function parse(source: string): AST {
  throw new Error('Parse failed');
}

// GOOD
function parse(source: string): Result<AST, Error[]> {
  const errors: Error[] = [];
  if (errors.length > 0) {
    return { ok: false, errors };
  }
  return { ok: true, value: ast };
}

❌ Mutable AST

// BAD
function transform(node: PersonaDeclaration) {
  node.skills.push(newSkill);
}

// GOOD
function transform(node: PersonaDeclaration): PersonaDeclaration {
  return {
    ...node,
    skills: [...node.skills, newSkill],
  };
}

❌ Missing Type Safety

// BAD
function processNode(node: any) {
  if (node.type === 'PersonaDecl') {
    // Typo - should be PersonaDeclaration
  }
}

// GOOD
type ASTNode =
  | { type: 'PersonaDeclaration' /* ... */ }
  | { type: 'SkillDeclaration' /* ... */ };

function processNode(node: ASTNode) {
  switch (
    node.type
    // TypeScript enforces correct types
  ) {
  }
}

Performance Optimization

Caching Strategies

// Memoize expensive computations
const typeCache = new Map<ASTNode, Type>();

function inferType(node: ASTNode): Type {
  if (typeCache.has(node)) {
    return typeCache.get(node)!;
  }
  const type = computeType(node);
  typeCache.set(node, type);
  return type;
}

String Interning

// Deduplicate identical strings
class StringPool {
  private pool = new Map<string, string>();

  intern(str: string): string {
    if (this.pool.has(str)) {
      return this.pool.get(str)!;
    }
    this.pool.set(str, str);
    return str;
  }
}

Stream Processing

// Process large files in chunks
async function* parseStream(stream: ReadableStream): AsyncGenerator<ASTNode> {
  const lexer = new StreamingLexer(stream);
  const parser = new IncrementalParser(lexer);

  for await (const node of parser.parseNodes()) {
    yield node;
  }
}

Reference Documentation

Detailed material lives alongside this skill and is read on demand:

• Core Competencies — Language Design & Specification, Compiler Architecture, Runtime Systems, Language Server Protocol (LSP), Model Context Protocol (MCP), Standard Library (stdlib), Registry & Package Management, Observability & Telemetry
• Best Practices — Compiler Development, Runtime Design, Language Design, Testing Strategy

Resources

Official Documentation

• GitHub Repository: https://github.com/personamanagmentlayer/pcl
• Language Specification: docs/reference/LANGUAGE.md
• Compiler Design: docs/HOW_PCL_WORKS.md
• Runtime Systems: docs/SKILL_RUNTIME.md
• LSP Implementation: docs/guides/VSCODE-SETUP.md

Learning Resources

• Crafting Interpreters: https://craftinginterpreters.com/
• Modern Compiler Implementation: https://www.cs.princeton.edu/~appel/modern/
• TypeScript Deep Dive: https://basarat.gitbook.io/typescript/
• Language Server Protocol: https://microsoft.github.io/language-server-protocol/
• Model Context Protocol: https://modelcontextprotocol.io/

Standards & Specifications

• ISO 5218: Gender Representation
• ISO 639-1: Language Codes
• IEEE 2410: Biometric Open Protocol
• W3C: Web Standards
• OpenTelemetry: Observability Standards
• OpenAPI: API Specification

Community

• Discord: PCL Developer Community
• Stack Overflow: Tag persona-control-language
• GitHub Discussions: Q&A and feature requests
• Newsletter: Monthly PCL updates

Version History

• v1.0.0 (2026-01-31): Initial PCL Expert skill
  • Comprehensive compiler architecture coverage
  • Runtime systems and execution engine
  • LSP and MCP integration
  • Adaptive intelligence features
  • HTTP registry server
  • CLI tooling
  • Standard library overview
  • Best practices and anti-patterns
  • Performance optimization techniques

Maintenance

Status: ✅ Active Last Updated: 2026-01-31 Maintainer: PCL Core Team License: MIT