Create README and CHANGELOG

Overview

Transforms a raw repository into a well-documented project by generating professional README.md and CHANGELOG.md files based on empirical evidence from the codebase, git history, and configuration files. Every claim in the generated documentation must be traceable to a file, commit, or config in the repository.

When to Use

• When a project lacks a README or CHANGELOG.

• When existing documentation is outdated, incomplete, or inconsistent.

• Before shipping a new version to ensure the changelog is up to date.

• When restructuring a project and the existing documentation no longer reflects the architecture.

• When onboarding new contributors and the README doesn't answer "what is this, how do I run it, how do I test it?"

• User asks or mentions this skill in English (e.g., "use /create-readme", "run create-readme").

• O usuário pede ou menciona esta skill em português (ex.: "use /create-readme", "execute create-readme").

When NOT to Use

• API reference docs — use OpenAPI/Swagger, TypeDoc, Sphinx, or docfx instead.
• License files — copy the appropriate license text directly (MIT, Apache-2.0, etc.).
• Internal code documentation — use docstrings, JSDoc, TSDoc, or XML doc comments.
• Architecture diagrams — use the architecture skill (which routes to drawio-architecture, mermaid-architecture, and optional archify) for visual and Markdown system design.
• Agent harness setup — use create-agent-harness for CLAUDE.md/AGENTS.md and skill scaffolding.

Process

Phase 1: Discovery (Evidence Gathering)

Before writing a single line, analyze the target repository:

Structure analysis:

• Root directory tree and top-level files (ls -la, find . -maxdepth 2 -type f)
• Identify entry points (main.ts, Program.cs, __main__.py, index.js)
• Detect monorepo vs. single-package layout

Stack detection:

• Node.js: package.json (name, version, scripts, dependencies, engines)
• .NET: *.csproj, *.sln (TargetFramework, PackageReferences, SDK version)
• Python: pyproject.toml, setup.py, requirements.txt, Pipfile
• Java: pom.xml, build.gradle (groupId, artifactId, Java version)
• Go: go.mod (module path, Go version, requires)
• Rust: Cargo.toml (name, edition, dependencies)
• Docker: Dockerfile, docker-compose.yml (base image, exposed ports, services)
• CI/CD: .github/workflows/, .gitlab-ci.yml, Jenkinsfile, azure-pipelines.yml

History analysis:

• git log --oneline -n 50 — recent features and fixes
• git tag --sort=-creatordate | head -10 — recent releases
• git log --since="last tag" --oneline — unreleased changes

Existing docs:

• Current README.md and CHANGELOG.md (if any) — reuse valid content
• docs/ directory — reference but don't duplicate
• LICENSE file — extract license type

Requirement: Output a "Discovery Summary" containing:

## Discovery Summary
- **Stack**: [languages, frameworks, versions]
- **Architecture**: [monorepo/single, layers, patterns]
- **CI/CD**: [platforms, pipelines, badges available]
- **Entry points**: [main files]
- **Test command**: [how to run tests]
- **Recent releases**: [last 3 tags]
- **Unreleased changes**: [commits since last tag]
- **Gaps**: [what's missing from current docs]

Wait for confirmation before proceeding to Phase 2.

Phase 2: README.md Authoring

Generate the README following this strict order. Skip sections where no evidence exists — do not invent content.

2.1 Title & Badges

• Project name from package.json/*.csproj/pyproject.toml or directory name
• Badges: CI status (from workflow file), license (from LICENSE file), version (from package manifest), language coverage (if configured)
• Badge format: [![Name](url)](link)

2.2 Project Description

• One-sentence summary (what it does, for whom)
• Rich paragraph (functional and strategic overview)
• Evidence: derive from code comments, existing docs, commit messages — never guess

2.3 Repository Structure

project-root/
├── src/              # Source code
├── tests/            # Test suite
├── docs/             # Documentation
├── .github/workflows # CI/CD pipelines
└── package.json      # Node.js manifest

• One-line description per top-level directory
• Only include directories that actually exist

2.4 Tech Stack

• Versions from package manifests, not guesses
• Include runtime requirements (Node version, Python version, .NET version)

2.5 Architecture

• Layers and patterns (Clean Architecture, DDD, MVC, microservices)
• Mermaid diagram if the system has 3+ interacting components
• Evidence: derive from directory structure and dependency graph

2.6 System Flow

• Mermaid sequence/flow diagram for the main use case
• Or textual step-by-step description for simple systems
• Only include if the flow is non-obvious from the code

2.7 Getting Started

# Prerequisites
node >= 20.x

# Install
npm install

# Configure
cp .env.example .env  # then edit values

# Run
npm run dev

• Prerequisites with specific versions
• Environment variables (names only, never values — link to .env.example)
• Install and run commands from scripts in package manifest or Makefile

2.8 Tests & Coverage

npm test              # Run all tests
npm run test:watch    # Watch mode
npm run test:coverage # Coverage report

• Commands from package manifest scripts or Makefile
• Coverage threshold if configured (.nycrc, jest.config, coverlet)
• Badge if coverage reporting is set up

2.9 Business & Technical Views

• Business: strategic goals, target users, problem solved
• Technical: key design decisions, trade-offs, constraints
• Only include if evidence exists in docs, comments, or commit messages

2.10 License & Status

• License type from LICENSE file
• Project status: active, maintained, experimental, deprecated (from recent commit activity)
• Link to full license text

2.11 Links

• Internal references (docs/, CHANGELOG.md, contributing guide)
• External references (homepage, demo, API docs) if they exist

2.12 Language routing and docs/ structure

Create a bilingual documentation layout:

• README.md — English (en-us), always the primary landing page.
• README.pt-br.md — Portuguese (pt-br) translation of README.md.
• docs/en/ — auxiliary English documents generated from repository evidence.
• docs/pt/ — same documents in pt-br.

Rules for docs/:

• Place every auxiliary document in both docs/en/ and docs/pt/.
• Each README links to its counterpart at the top: [Português](README.pt-br.md) in README.md; [English](README.md) in README.pt-br.md.
• Each README links to docs/en/ or docs/pt/ for deeper docs.
• Do not duplicate README.md content inside docs/. Put extended/auxiliary content there (e.g., ARCHITECTURE.md, CONTRIBUTING.md, API.md, INSTALL.md).
• Generate a doc only when evidence exists in the repo. Never invent auxiliary docs.
• Keep the same filename in both folders (e.g., docs/en/CONTRIBUTING.md and docs/pt/CONTRIBUTING.md).

Evidence-based docs to consider:

• ARCHITECTURE.md — if architecture patterns or diagrams were identified.
• CONTRIBUTING.md — if .github/CONTRIBUTING.md or commit conventions exist.
• API.md — if the project exposes a REST/GraphQL API (link to OpenAPI/Swagger if present).
• INSTALL.md — if setup has platform-specific steps beyond the README.

Rules:

• Reuse existing content where applicable — don't rewrite what's already correct
• Only include sections where concrete evidence exists
• README.md is always en-us; README.pt-br.md is the pt-br translation
• Auxiliary docs live under docs/en/ and docs/pt/ and must not duplicate README content
• Never hardcode secrets, API keys, or environment variable values

Phase 3: CHANGELOG.md Authoring

Follow the Keep a Changelog and SemVer standards:

3.1 Structure

# Changelog

All notable changes to this project are documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/),
and this project adheres to [Semantic Versioning](https://semver.org/).

## [Unreleased]

### Added
- New feature X (commit abc123)

### Fixed
- Bug Y in module Z (commit def456)

## [1.2.0] - 2025-01-15

### Added
- Feature A

### Changed
- Updated dependency B to v2.0

[Unreleased]: https://github.com/user/repo/compare/v1.2.0...HEAD
[1.2.0]: https://github.com/user/repo/releases/tag/v1.2.0

3.2 Categories

• Added — new features
• Changed — changes in existing functionality
• Deprecated — soon-to-be removed features
• Removed — removed features
• Fixed — bug fixes
• Security — vulnerability fixes

3.3 Source

• Populate [Unreleased] by analyzing git log --since="last tag" --oneline
• Map commit prefixes (feat:, fix:, breaking:) to changelog categories
• For past versions, use git log v1.1.0..v1.2.0 --oneline between tags
• If no tags exist, create [Unreleased] from the last 50 commits

3.4 Linking

• Link version numbers to GitHub compare URLs: https://github.com/{owner}/{repo}/compare/v{prev}...v{curr}
• Link tags to release pages: https://github.com/{owner}/{repo}/releases/tag/v{version}

Phase 4: Delivery & Verification

4.1 Branching

Create a dedicated branch:

git checkout -b feature/{YYYYMMDD}-readme-changelog

4.2 Linting

• Run a Markdown linter if available (markdownlint, remark, vale)
• Check for broken internal links
• Verify Mermaid diagram syntax (if included)

4.3 Commit

Use Conventional Commits:

git commit -m "docs(readme): update README and CHANGELOG

- Add tech stack table from package.json analysis
- Add getting started section with verified commands
- Populate CHANGELOG [Unreleased] from git log since v1.2.0

Generated with [Devin](https://devin.ai)"

4.4 Reporting

Provide a summary of changes:

## Summary
- **README.md**: [created/updated] — en-us primary, added sections X, Y, Z
- **README.pt-br.md**: [created/updated] — pt-br translation
- **docs/en/** and **docs/pt/**: [created/updated] — auxiliary docs by language
- **CHANGELOG.md**: [created/updated] — added [Unreleased] with N entries
- **Evidence**: all claims traced to files/commits in Discovery Summary

Do not open the PR automatically — let the human reviewer decide.

Common Mistakes

Verification Checklist

• Discovery Summary was produced and confirmed before generation
• README includes all required sections based on available evidence
• No section contains invented or unverifiable information
• Tech stack versions match package manifests exactly
• Getting Started commands were verified against scripts/Makefile
• No secrets, API keys, or environment variable values are present
• CHANGELOG follows the "Keep a Changelog" format with all 6 categories
• CHANGELOG [Unreleased] section matches git log since last tag
• Version links point to valid compare/release URLs
• Mermaid diagrams (if any) have valid syntax
• Branch naming follows the project's convention
• Commit message follows Conventional Commits
• README.pt-br.md is generated as a pt-br translation of README.md
• docs/en/ and docs/pt/ exist for auxiliary docs
• Language switcher links connect README.md and README.pt-br.md
• No README.md content is duplicated inside docs/

References

• Keep a Changelog
• Semantic Versioning
• Conventional Commits
• Shields.io — badge generation
• makeareadme.com — README best practices