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Changelog

All notable changes to PULSE Protocol Python implementation will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Planned

  • Compact encoding (13× size reduction)
  • CI/CD with GitHub Actions
  • PyPI publication
  • Framework integrations (Flask, FastAPI)
  • Implementations in Rust, Go, JavaScript

[0.5.0] - 2026-02-22

Added 🌐

  • TLS Transport Layer (Security Layer 1)
    • TLSConfig dataclass for SSL/TLS configuration
    • generate_self_signed_cert() for development certificates
    • Server-side SSL context with certificate/key loading
    • Client-side SSL context with CA verification
    • Mutual TLS (mTLS) support for agent authentication
    • TLS 1.2+ minimum version enforcement
    • Custom cipher suite configuration
  • Vocabulary expanded to 1,000 semantic concepts
    • ENT (Entities): 100 concepts
    • ACT (Actions): 200 concepts
    • PROP (Properties): 150 concepts
    • REL (Relations): 100 concepts
    • LOG (Logic): 50 concepts
    • MATH (Mathematics): 100 concepts
    • TIME (Temporal): 50 concepts
    • SPACE (Spatial): 50 concepts
    • DATA (Data Types): 100 concepts
    • META (Meta): 100 concepts
  • HTTP Client/Server for agent-to-agent communication
    • PulseServer with handler registration and wildcard matching
    • PulseClient with send, fire-and-forget, ping, and stats
    • JSON and binary (MessagePack) encoding over HTTP
    • HMAC signing integration for defense in depth
    • Health check endpoint (/health)
  • 31 TLS tests covering certificates, contexts, HTTPS communication
  • New example: 08_tls_transport.py demonstrating HTTPS + HMAC signing
  • cryptography dependency for certificate generation

Changed

  • Test suite expanded from 165+ to 256 tests
  • PulseServer accepts tls parameter for HTTPS
  • PulseClient accepts tls, verify_ssl, client_certfile, client_keyfile
  • pulse/__init__.py exports TLSConfig and generate_self_signed_cert
  • Server URL property returns https:// when TLS configured

Fixed

  • test_validate_new_act_concepts updated: replaced non-existent ACT.LEARN.TRAIN with ACT.PROCESS.BATCH

[0.4.0] - 2025-02-05

Added 🖥️

  • CLI tool (pulse command) for all PULSE operations
    • pulse create - Create new messages with validation
    • pulse validate - Validate message structure and semantics
    • pulse sign - Sign messages with HMAC-SHA256
    • pulse verify - Verify message signatures
    • pulse encode - Encode to binary format with size comparison
    • pulse decode - Decode from binary with auto-format detection
    • Programmatic usage from Python scripts
    • Automation and scripting support
  • Performance benchmarks suite with statistical analysis
    • Message creation benchmarks
    • JSON encoding/decoding benchmarks
    • Binary encoding/decoding benchmarks
    • Signature signing/verification benchmarks
    • Validation benchmarks
    • Vocabulary operation benchmarks
    • Warmup iterations for accurate results
    • Statistical metrics: mean, median, min, max, stdev, ops/sec
  • 25+ CLI tests covering all commands
    • Command execution tests
    • Roundtrip workflow tests
    • Error handling tests
    • Integration tests
  • New example: 07_cli_usage.py
    • 9 comprehensive demonstrations
    • Complete workflow examples
    • Real-world use cases
    • Best practices and automation patterns

Changed

  • Test suite expanded from 140+ to 165+ tests
  • README updated with CLI documentation and examples
  • Project structure includes cli.py and benchmarks.py
  • Project status updated to Week 4 Complete
  • Performance metrics documented and benchmarked

Technical Details

  • CLI built with argparse for standard Python interface
  • Supports JSON and binary file I/O
  • Compatible with shell scripting and automation
  • Environment variable support for secret keys
  • Exit codes for error handling
  • Pretty output with ✓/✗ indicators
  • Size comparison statistics (reduction factor, savings %)

Performance

  • CLI commands execute in <100ms for typical messages
  • Benchmarks show consistent sub-millisecond operations
  • 1000 encode/decode operations < 1 second
  • Minimal overhead for automation workflows

[0.3.0] - 2025-02-05

Added 🔒

  • HMAC-SHA256 message signing for integrity verification
    • Deterministic signing (same message + key = same signature)
    • Constant-time signature comparison (timing attack protection)
    • Tamper detection for any message modification
    • ~1-2ms overhead per operation
  • SecurityManager class for signing and verification
    • sign_message() - Sign with HMAC-SHA256
    • verify_signature() - Verify signature with constant-time comparison
    • check_replay_protection() - Validate timestamp and nonce
    • generate_key() - Generate secure random keys (32 bytes)
  • Replay attack protection
    • Timestamp freshness validation (default 5-minute window)
    • Nonce deduplication support
    • Configurable max age
    • 60-second clock skew tolerance
  • KeyManager class for key storage
    • Simple key store for development
    • Generate, store, retrieve, remove keys
    • Per-agent key management
  • 40+ security tests covering all features
    • Signing and verification roundtrips
    • Tamper detection tests
    • Replay attack simulations
    • Key management tests
    • Integration with binary encoding
  • New example: 06_security_features.py
    • 8 comprehensive demonstrations
    • Performance benchmarks
    • Best practices and production checklist
    • Secure message flow examples

Changed

  • Test suite expanded from 100+ to 140+ tests
  • README updated with security documentation
  • API Reference includes SecurityManager and KeyManager
  • Project status updated to Week 3 Complete

Technical Details

  • Canonical string creation for deterministic signing
  • Uses Python's hmac and hashlib (SHA256)
  • secrets.token_urlsafe(32) for key generation
  • Signatures stored in envelope['signature']
  • No encryption (integrity only, use TLS for confidentiality)

Security

  • Constant-time comparison prevents timing attacks
  • Replay protection prevents duplicate messages
  • Tamper detection catches all modifications
  • Defense in depth: signatures + TLS (when added) + validation

[0.2.0] - 2025-02-05

Added ⚡

  • Binary encoding/decoding using MessagePack format
    • ~10× size reduction compared to JSON
    • Typical message: JSON ~800 bytes → Binary ~80 bytes
    • Fast serialization/deserialization
    • Language-agnostic format
  • Unified Encoder class supporting multiple formats
    • Auto-detection of format when decoding
    • Size comparison utilities
    • Support for JSON and Binary formats
  • PulseMessage binary methods
    • to_binary() - Serialize to MessagePack
    • from_binary() - Deserialize from MessagePack
  • CompactEncoder placeholder for future custom format
  • 30+ encoder tests with roundtrip validation
  • Performance benchmarks in test suite
  • Two new examples
    • 04_binary_encoding.py - Binary encoding demonstrations and benchmarks
    • 05_error_handling.py - Error handling patterns (retry, circuit breaker)
  • Type preservation in binary encoding (strings, numbers, booleans, nulls, lists, dicts)
  • Enhanced documentation with binary encoding examples

Changed

  • Test suite expanded from 70+ to 100+ tests
  • Code coverage increased to 90%+
  • README updated with binary encoding documentation
  • Project status updated to Week 2 Complete

Technical Details

  • MessagePack encoding with use_bin_type=True
  • Binary format detection in unified decoder
  • Preserves exact message structure (envelope, type, content)
  • No validation on decode for performance

[0.1.0] - 2025-02-05

Added

  • Initial project structure
  • Basic documentation (README, CONTRIBUTING, LICENSE)
  • Development tools configuration (black, pytest, pylint, mypy)
  • Core PulseMessage class with envelope, type, and content structure
  • JSON serialization and deserialization
  • Vocabulary system with 120+ semantic concepts across 10 categories
  • MessageValidator with three-stage validation pipeline
  • Comprehensive test suite (70+ tests)
  • Three working examples (Hello World, Vocabulary & Validation, Use Cases)
  • Type hints throughout the codebase
  • Google-style docstrings for all public APIs

Categories in Vocabulary

  • ENT (Entities): 20 concepts - Data types, agents, resources
  • ACT (Actions): 34 concepts - Queries, analysis, creation, transformation
  • PROP (Properties): 16 concepts - States, quality, size, priority
  • REL (Relations): 5 concepts - Structural relationships
  • LOG (Logic): 6 concepts - Logical operators
  • MATH (Mathematics): 9 concepts - Arithmetic, aggregation
  • TIME (Temporal): 6 concepts - Time relationships
  • SPACE (Spatial): 6 concepts - Spatial relationships
  • DATA (Data Types): 7 concepts - Data structures
  • META (Meta): 11 concepts - Status, errors, control

Release Notes

Version 0.4.0 - CLI Tool & Performance Release 🖥️

Release Date: 2025-02-05 Status: Development - Week 4 Complete

This release adds a comprehensive command-line interface and performance benchmarks suite.

New Features:

  • 🖥️ CLI tool - Full command-line interface (pulse command)
  • 🖥️ 6 CLI commands - create, validate, sign, verify, encode, decode
  • 📊 Performance benchmarks - Statistical analysis of all operations
  • 🔧 Automation support - Shell scripting and programmatic usage
  • 📝 CLI examples - 9 demonstrations with real-world use cases

CLI Commands:

  • pulse create - Create messages with action, target, parameters
  • pulse validate - Validate structure, semantics, freshness
  • pulse sign - Sign with HMAC-SHA256 using secret key
  • pulse verify - Verify signatures and detect tampering
  • pulse encode - Encode to binary with size comparison
  • pulse decode - Decode from binary with auto-detection

Performance:

  • CLI operations: <100ms for typical messages
  • Message creation: ~0.5ms average
  • JSON encode/decode: ~0.3ms average
  • Binary encode/decode: ~0.2ms average (faster than JSON!)
  • Signing: ~1-2ms average
  • Verification: ~1-2ms average
  • All operations: 1000+ ops/sec throughput

What's Working:

  • ✅ Core message creation and parsing
  • ✅ JSON encoding/decoding (human-readable)
  • ✅ Binary encoding/decoding (10× size reduction) ⚡
  • ✅ HMAC-SHA256 message signing 🔒
  • ✅ Replay protection (timestamp + nonce) 🔒
  • ✅ Tamper detection 🔒
  • ✅ CLI tool with 6 commands 🖥️
  • ✅ Performance benchmarks suite 🖥️
  • ✅ Semantic vocabulary (120+ concepts)
  • ✅ Three-stage message validation
  • ✅ Error handling patterns
  • ✅ Key management (SecurityManager, KeyManager)
  • ✅ 165+ unit tests with 90%+ coverage
  • ✅ Type-safe with full type hints
  • ✅ Comprehensive documentation

Use Cases:

  • Automation: Batch message creation and validation
  • Testing: Message validation pipelines
  • Development: Quick prototyping and debugging
  • Production: Secure message workflows with signing
  • Scripting: Shell integration for DevOps

Known Limitations:

  • Vocabulary contains 120 concepts (target: 1,000)
  • Compact encoding not yet implemented (placeholder in place)
  • TLS integration not yet implemented
  • Network client/server not yet implemented

Next Steps (Future):

  • TLS integration for transport security
  • Network client/server implementation
  • Compact encoding (13× size reduction)
  • Framework integrations (Flask, FastAPI, etc.)
  • Vocabulary expansion to 1,000 concepts

Version 0.3.0 - Security Features Release 🔒

Release Date: 2025-02-05 Status: Development - Week 3 Complete

This release adds comprehensive security features with HMAC-SHA256 signing and replay protection.

New Features:

  • 🔒 HMAC-SHA256 signing - Message integrity verification
  • 🔒 Signature verification - Constant-time comparison for security
  • 🔒 Replay protection - Timestamp freshness + nonce deduplication
  • 🔒 Tamper detection - Any modification invalidates signature
  • 🔒 Key management - SecurityManager and KeyManager classes
  • 📝 Security examples - 8 demonstrations with best practices

Security Features:

  • Deterministic signing (same message + key = same signature)
  • Constant-time comparison prevents timing attacks
  • Configurable timestamp validity window (default 5 minutes)
  • 60-second clock skew tolerance
  • Secure random key generation (32 bytes)
  • Per-agent key storage and retrieval

Performance:

  • Signing: ~1-2ms per operation
  • Verification: ~1-2ms per operation
  • Minimal overhead for production use
  • 1000 operations < 1 second

What's Working:

  • ✅ Core message creation and parsing
  • ✅ JSON encoding/decoding (human-readable)
  • ✅ Binary encoding/decoding (10× size reduction) ⚡
  • ✅ HMAC-SHA256 message signing 🔒
  • ✅ Replay protection (timestamp + nonce) 🔒
  • ✅ Tamper detection 🔒
  • ✅ Semantic vocabulary (120+ concepts)
  • ✅ Three-stage message validation
  • ✅ Error handling patterns
  • ✅ Key management (SecurityManager, KeyManager)
  • ✅ 140+ unit tests with 90%+ coverage
  • ✅ Type-safe with full type hints
  • ✅ Comprehensive documentation

Known Limitations:

  • Vocabulary contains 120 concepts (target: 1,000)
  • Compact encoding not yet implemented (placeholder in place)
  • TLS integration not yet implemented
  • Network client/server not yet implemented
  • Signatures provide integrity only (not confidentiality - use TLS)

Next Steps (Week 4):

  • CLI tool for message creation and validation
  • Performance optimization and benchmarks
  • Full API documentation
  • TLS integration guide

Version 0.2.0 - Binary Encoding Release ⚡

Release Date: 2025-02-05 Status: Development - Week 2 Complete

This release adds high-performance binary encoding with MessagePack, achieving 10× size reduction compared to JSON.

New Features:

  • ⚡ Binary encoding - MessagePack format with 10× size reduction
  • ⚡ Unified Encoder - Single interface for JSON and Binary formats
  • ⚡ Auto-format detection - Automatically detect format when decoding
  • ⚡ Performance benchmarks - Comprehensive encoding/decoding tests
  • 📝 Error handling examples - Retry strategies, circuit breaker patterns
  • 📊 Size comparison utilities - Compare encoding efficiency

Performance:

  • Typical message: JSON ~800 bytes → Binary ~80 bytes (10× smaller)
  • Encoding speed: 1000 messages < 1 second
  • Decoding speed: 1000 messages < 1 second
  • Type preservation: All Python types preserved in binary format

What's Working:

  • ✅ Core message creation and parsing
  • ✅ JSON encoding/decoding (human-readable)
  • ✅ Binary encoding/decoding (10× size reduction) ⚡
  • ✅ Semantic vocabulary (120+ concepts)
  • ✅ Three-stage message validation
  • ✅ Error handling patterns
  • ✅ 100+ unit tests with 90%+ coverage
  • ✅ Type-safe with full type hints
  • ✅ Comprehensive documentation

Known Limitations:

  • Vocabulary contains 120 concepts (target: 1,000)
  • Compact encoding not yet implemented (placeholder in place)
  • Security features (signing, replay protection) not yet implemented
  • Network client/server not yet implemented

Next Steps (Week 3):

  • Security features (HMAC signing, replay protection)
  • TLS support for network transmission
  • Additional security tests

Version 0.1.0 - Alpha Release

Release Date: 2025-02-05 Status: Development - Week 1 Foundation Complete

This is the initial alpha release of PULSE Protocol Python implementation.

Features:

  • ✅ Core message creation and parsing
  • ✅ JSON encoding/decoding
  • ✅ Semantic vocabulary (120+ concepts)
  • ✅ Message validation
  • ✅ 70+ unit tests
  • ✅ Type-safe with full type hints
  • ✅ Comprehensive documentation

Legend:

  • Added - New features
  • Changed - Changes in existing functionality
  • Deprecated - Soon-to-be removed features
  • Removed - Removed features
  • Fixed - Bug fixes
  • Security - Security improvements