Changelog

Changelog

Every release, every change. Full transparency.

v4.0.1 Security March 1, 2026
Security Hardening
  • Replaced MIT license with Elastic License 2.0 (ELv2) for stronger IP protection
  • Stripped source maps from the npm tarball, reducing package size from 256KB to 110KB
  • Scrubbed internal implementation details from public documentation
v4.0.0 Breaking March 1, 2026
Prompt Control Plane
  • Full rebrand from “Prompt Optimizer MCP” to “Prompt Control Plane”
  • Enterprise tier gates for policy enforcement, audit logging, and config lock features
  • New documentation and pricing comparison pages
  • License prefix change: po_pro_ → pcp_
  • Storage path migration: ~/.prompt-optimizer/ → ~/.prompt-control-plane/
v3.3.0 New March 1, 2026
Enterprise Operations
  • Policy enforcement mode with advisory and enforce configurations
  • Tamper-evident audit logging with cryptographic hash chains
  • Config lock mode with passphrase protection for governance control
  • Two new tools: delete_session and purge_sessions for session lifecycle management
  • Comprehensive test coverage for enterprise workflows
v3.2.1 New March 1, 2026
Session History & Custom Rules
  • Reproducible session exports with auto-calculated integrity hashes
  • Custom rules support from local configuration directory
  • Rules versioning constant for drift detection across environments
v3.2.0 New March 1, 2026
Enterprise Unlock
  • Enterprise tier with 120 requests per minute and unlimited usage
  • Multi-page documentation site with dedicated pages for features, models, contact, and more
  • Shared design system with dark and light theme support
v3.1.0 New March 1, 2026
Smart Compression & Tool Pruning
  • Multi-stage context compression pipeline that strips irrelevant content and reports token savings
  • Zone scanner that protects structured content (code blocks, tables, lists) from modification
  • Tool pruning engine with relevance scoring to reduce context window usage
  • Four new ambiguity detection rules covering hallucination risk, underspecified agents, conflicting constraints, and model-scope mismatch
  • Pre-flight deltas showing estimated token savings before committing to optimization
v3.0.0 Breaking February 28, 2026
Decision Engine
  • Reasoning complexity classifier with six complexity types for intelligent model selection
  • Five optimization profiles: cost minimizer, balanced, quality first, creative, and enterprise safe
  • Deterministic model routing with full decision path audit trail
  • Dimensional risk scoring across four axes, scored 0–100
  • Perplexity provider support for research-oriented prompts
  • Three new tools: classify_task, route_model, and pre_flight
v2.3.0 New February 28, 2026
CLI Linter & GitHub Action
  • prompt-lint CLI binary for running prompt quality checks in CI/CD pipelines
  • GitHub Action for seamless workflow integration with configurable thresholds
  • Comprehensive CLI test suite
v2.2.0 New February 27, 2026
Programmatic API & Landing Page
  • Programmatic import { optimize } API for using the engine as a library
  • Curl-based installer for quick setup
  • GitHub Pages product site for documentation and marketing
v2.1.0 New February 27, 2026
Monetization
  • Three-tier pricing: Free, Pro, and Power with usage-based metering
  • Ed25519 offline license activation — no accounts, no network calls
  • Multi-LLM output targets: Claude XML, OpenAI system/user, and generic Markdown
  • Six new tools bringing the total to 11
v1.0.0 New February 26, 2026
Initial Release
  • Five core MCP tools for prompt analysis, scoring, compilation, refinement, and approval
  • Quality scoring on a 0–100 scale across five dimensions
  • Structured prompt compilation targeting Claude’s XML format
  • Session management for iterative prompt refinement
  • Zero LLM calls — fully deterministic, runs entirely offline

Want to see what’s next?

Follow the project on GitHub for release notes and updates.

View on GitHub →