claude-engineering-plugin/plugins/compound-engineering/CHANGELOG.md

Changelog

All notable changes to the compound-engineering plugin will be documented in this file.

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

[2.22.0] - 2026-01-05

Added

• rclone skill - Upload files to S3, Cloudflare R2, Backblaze B2, and other cloud storage providers

Changed

• /feature-video command - Enhanced with:
  • Better ffmpeg commands for video/GIF creation (proper scaling, framerate control)
  • rclone integration for cloud uploads
  • Screenshot copying to project folder
  • Improved upload options workflow

Summary

• 27 agents, 20 commands, 13 skills, 2 MCP servers

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[2.21.0] - 2026-01-05

Fixed

• Version history cleanup after merge conflict resolution

Summary

This release consolidates all recent work:

• /feature-video command for recording PR demos
• /deepen-plan command for enhanced planning
• create-agent-skills skill rewrite (official spec compliance)
• agent-native-architecture skill major expansion
• dhh-rails-style skill consolidation (merged dhh-ruby-style)
• 27 agents, 20 commands, 12 skills, 2 MCP servers

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[2.20.0] - 2026-01-05

Added

• /feature-video command - Record video walkthroughs of features using Playwright

Changed

• create-agent-skills skill - Complete rewrite to match Anthropic's official skill specification

Removed

• dhh-ruby-style skill - Merged into dhh-rails-style skill

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[2.19.0] - 2025-12-31

Added

• /deepen-plan command - Power enhancement for plans. Takes an existing plan and runs parallel research sub-agents for each major section to add:

  • Best practices and industry patterns
  • Performance optimizations
  • UI/UX improvements (if applicable)
  • Quality enhancements and edge cases
  • Real-world implementation examples

  The result is a deeply grounded, production-ready plan with concrete implementation details.

Changed

• /workflows:plan command - Added /deepen-plan as option 2 in post-generation menu. Added note: if running with ultrathink enabled, automatically run deepen-plan for maximum depth.

[2.18.0] - 2025-12-25

Added

• agent-native-architecture skill - Added Dynamic Capability Discovery pattern and Architecture Review Checklist:

  New Patterns in mcp-tool-design.md:

  • Dynamic Capability Discovery - For external APIs (HealthKit, HomeKit, GraphQL), build a discovery tool (list_*) that returns available capabilities at runtime, plus a generic access tool that takes strings (not enums). The API validates, not your code. This means agents can use new API capabilities without code changes.
  • CRUD Completeness - Every entity the agent can create must also be readable, updatable, and deletable. Incomplete CRUD = broken action parity.

  New in SKILL.md:

  • Architecture Review Checklist - Pushes reviewer findings earlier into the design phase. Covers tool design (dynamic vs static, CRUD completeness), action parity (capability map, edit/delete), UI integration (agent → UI communication), and context injection.
  • Option 11: API Integration - New intake option for connecting to external APIs like HealthKit, HomeKit, GraphQL
  • New anti-patterns: Static Tool Mapping (building individual tools for each API endpoint), Incomplete CRUD (create-only tools)
  • Tool Design Criteria section added to success criteria checklist

  New in shared-workspace-architecture.md:

  • iCloud File Storage for Multi-Device Sync - Use iCloud Documents for your shared workspace to get free, automatic multi-device sync without building a sync layer. Includes implementation pattern, conflict handling, entitlements, and when NOT to use it.

Philosophy

This update codifies a key insight for agent-native apps: when integrating with external APIs where the agent should have the same access as the user, use Dynamic Capability Discovery instead of static tool mapping. Instead of building read_steps, read_heart_rate, read_sleep... build list_health_types + read_health_data(dataType: string). The agent discovers what's available, the API validates the type.

Note: This pattern is specifically for agent-native apps following the "whatever the user can do, the agent can do" philosophy. For constrained agents with intentionally limited capabilities, static tool mapping may be appropriate.

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[2.17.0] - 2025-12-25

Enhanced

• agent-native-architecture skill - Major expansion based on real-world learnings from building the Every Reader iOS app. Added 5 new reference documents and expanded existing ones:

  New References:

  • dynamic-context-injection.md - How to inject runtime app state into agent system prompts. Covers context injection patterns, what context to inject (resources, activity, capabilities, vocabulary), implementation patterns for Swift/iOS and TypeScript, and context freshness.
  • action-parity-discipline.md - Workflow for ensuring agents can do everything users can do. Includes capability mapping templates, parity audit process, PR checklists, tool design for parity, and context parity guidelines.
  • shared-workspace-architecture.md - Patterns for agents and users working in the same data space. Covers directory structure, file tools, UI integration (file watching, shared stores), agent-user collaboration patterns, and security considerations.
  • agent-native-testing.md - Testing patterns for agent-native apps. Includes "Can Agent Do It?" tests, the Surprise Test, automated parity testing, integration testing, and CI/CD integration.
  • mobile-patterns.md - Mobile-specific patterns for iOS/Android. Covers background execution (checkpoint/resume), permission handling, cost-aware design (model tiers, token budgets, network awareness), offline handling, and battery awareness.

  Updated References:

  • architecture-patterns.md - Added 3 new patterns: Unified Agent Architecture (one orchestrator, many agent types), Agent-to-UI Communication (shared data store, file watching, event bus), and Model Tier Selection (fast/balanced/powerful).

  Updated Skill Root:

  • SKILL.md - Expanded intake menu (now 10 options including context injection, action parity, shared workspace, testing, mobile patterns). Added 5 new agent-native anti-patterns (Context Starvation, Orphan Features, Sandbox Isolation, Silent Actions, Capability Hiding). Expanded success criteria with agent-native and mobile-specific checklists.

• agent-native-reviewer agent - Significantly enhanced with comprehensive review process covering all new patterns. Now checks for action parity, context parity, shared workspace, tool design (primitives vs workflows), dynamic context injection, and mobile-specific concerns. Includes detailed anti-patterns, output format template, quick checks ("Write to Location" test, Surprise test), and mobile-specific verification.

Philosophy

These updates operationalize a key insight from building agent-native mobile apps: "The agent should be able to do anything the user can do, through tools that mirror UI capabilities, with full context about the app state." The failure case that prompted these changes: an agent asked "what reading feed?" when a user said "write something in my reading feed"—because it had no publish_to_feed tool and no context about what "feed" meant.

[2.16.0] - 2025-12-21

Enhanced

• dhh-rails-style skill - Massively expanded reference documentation incorporating patterns from Marc Köhlbrugge's Unofficial 37signals Coding Style Guide:
  • controllers.md - Added authorization patterns, rate limiting, Sec-Fetch-Site CSRF protection, request context concerns
  • models.md - Added validation philosophy, let it crash philosophy (bang methods), default values with lambdas, Rails 7.1+ patterns (normalizes, delegated types, store accessor), concern guidelines with touch chains
  • frontend.md - Added Turbo morphing best practices, Turbo frames patterns, 6 new Stimulus controllers (auto-submit, dialog, local-time, etc.), Stimulus best practices, view helpers, caching with personalization, broadcasting patterns
  • architecture.md - Added path-based multi-tenancy, database patterns (UUIDs, state as records, hard deletes, counter caches), background job patterns (transaction safety, error handling, batch processing), email patterns, security patterns (XSS, SSRF, CSP), Active Storage patterns
  • gems.md - Added expanded what-they-avoid section (service objects, form objects, decorators, CSS preprocessors, React/Vue), testing philosophy with Minitest/fixtures patterns

Credits

• Reference patterns derived from Marc Köhlbrugge's Unofficial 37signals Coding Style Guide

[2.15.2] - 2025-12-21

Fixed

• All skills - Fixed spec compliance issues across 12 skills:
  • Reference files now use proper markdown links ([file.md](./references/file.md)) instead of backtick text
  • Descriptions now use third person ("This skill should be used when...") per skill-creator spec
  • Affected skills: agent-native-architecture, andrew-kane-gem-writer, compound-docs, create-agent-skills, dhh-rails-style, dspy-ruby, every-style-editor, file-todos, frontend-design, gemini-imagegen

Added

• CLAUDE.md - Added Skill Compliance Checklist with validation commands for ensuring new skills meet spec requirements

[2.15.1] - 2025-12-18

Changed

• /workflows:review command - Section 7 now detects project type (Web, iOS, or Hybrid) and offers appropriate testing. Web projects get /playwright-test, iOS projects get /xcode-test, hybrid projects can run both.

[2.15.0] - 2025-12-18

Added

• /xcode-test command - Build and test iOS apps on simulator using XcodeBuildMCP. Automatically detects Xcode project, builds app, launches simulator, and runs test suite. Includes retries for flaky tests.

• /playwright-test command - Run Playwright browser tests on pages affected by current PR or branch. Detects changed files, maps to affected routes, generates/runs targeted tests, and reports results with screenshots.