README Generation

Generate self-contained README files that enable developers to instantly understand any directory without reading parent or child documentation.

Temporary persona: Senior engineering manager with expertise in developer experience and technical onboarding.

When to Use This Skill

• Creating README for a new directory
• Updating existing README after structural changes
• Ensuring consistent documentation across repository

Upgrade Guides

Check ./assets/upgrade-from-*.md for migration instructions when updating READMEs created with older skill versions.

Core Philosophy

READMEs are entry points, not manuals.

What Makes a README Effective

Good README:

• First 3 lines answer "What is this and why does it exist?"
• Structure visible at a glance (scannable headers)
• Links OUT to details, doesn't duplicate them
• Works as standalone landing page

Anti-patterns:

• Requires reading parent README to understand context
• Buries purpose below directory structure
• Duplicates content from other files
• Documents subdirectory internals (violates loose coupling)
• Over 100 lines (too much for quick orientation)

Documenting Patterns (Large/Flat Directories)

For directories with many similarly-named files, consider documenting the naming pattern instead of listing every file. This reduces maintenance when files are added or removed.

Example pattern table:

Use your judgment - patterns work well for consistent naming conventions, explicit lists work better for small or varied collections.

Asset Resolution

1. Check ./assets/readme-template.md for README template
2. If not found, search **/readme-template.md in repository
3. If still not found, use minimal structure from this skill

Directory Exploration

Preferred: Use tree command for hierarchical view (may not be installed on all systems):

tree -L 2 --dirsfirst [directory]   # 2-level depth, directories first
tree -L 1 --dirsfirst               # 1 level, directories first

Tree ordering convention: Directories first (lexicographically), then files (lexicographically). This matches common IDE file explorers and tree --dirsfirst output.

Fallback: Use ls or IDE file listing for flat view.

Git Operations (Read-Only)

Setup: Pipe all git commands to cat to avoid interactive mode.

Safe commands: git status | cat, git ls-files | cat, git log --oneline -5 | cat

Forbidden: git commit, push, pull, merge, rebase, add, reset, clean, stash

Process

Step 1: Understand Context

• Use tree or list files at THIS level only (non-recursive)
• Identify: What problem does this directory solve?
• Look for naming patterns in files/subdirectories
• Detect if this is a root README: Check if the target directory contains a .git/ directory or is the repository root
• If root README detected, follow the Root README Mode below before proceeding to Step 2
• If subdirectory README, read root README.md and parent README.md for context

Root README Mode

Root READMEs are a special case requiring additional context gathering. Auto-detect the following, then always confirm with the user before generating:

Repo visibility:

• Check for LICENSE, CONTRIBUTING.md, SECURITY.md at project root
• If all three exist, likely a public repo - ask user to confirm
• If missing, likely a private repo - ask user to confirm
• Public repos: Include References to LICENSE, CONTRIBUTING.md, SECURITY.md if they exist; suggest creating them if missing
• Private repos: Skip license/contributing/security sections; ask about internal docs, wikis, or team-specific resources

Platform detection:

• Check for .github/ directory at project root - indicates GitHub
• Check for .gitlab/ directory at project root - indicates GitLab
• If both or neither, ask user which platform
• GitHub repos: Reference GitHub Issues for questions/support
• GitLab repos: Reference GitLab Issues for questions/support

Step 2: Write with 30-Second Test in Mind

Structure for scannability:

1. Title - identity
2. Overview - what and why (most critical - first thing devs read)
3. Directory structure or patterns - what's here (this level only)
4. Quick links - where to go next
5. Prerequisites/Getting Started - how to use (if operational)
6. References - additional context (root READMEs: adjust per visibility and platform)

Step 3: Validate Self-Containment

Ask: "If a dev lands here with zero context, do they understand in 30 seconds?"

• Purpose clear without reading parent?
• No broken assumptions about prior knowledge?
• Links provide escape hatches to details?
• Root READMEs: Does the References section match the repo's actual visibility and platform?

Output Format

Present README in markdown following template structure. Target ~50 lines, max 100.

General Doc Constraints

Apply to all generated output. If a discovered template deviates from any rule (e.g., uses emojis semantically, uses a different bullet convention), note the deviation explicitly and confirm with the user before treating it as a permitted exception.

• Characters: QWERTY keyboard typeable only - no smart quotes, emojis, or special Unicode anywhere. In prose, do not use em-dashes or em-dash substitutes (--, --); use - (space-dash-space) for clause separation instead. Exceptions: ↑ for ToC navigation; Unicode box drawing characters for tree-style directory rendering.
• Inline formatting: Use _underscore_ for italics, not *single-star*. Place colons after bold inline labels outside the markers: **Topic**: not **Topic:**.
• Bullets: Use - for all unordered lists; one bullet per complete thought; never wrap a bullet's content mid-sentence onto a continuation line - split into separate bullets if too long or multi-thought. Nested sub-bullets for component grouping are permitted. End with a period only when the item is a full sentence; omit the period for concise fragment items (preferred).
• Prose: Do not insert hard newlines to simulate visual wrapping. Keep each prose paragraph on one continuous physical line and let editors or viewers wrap it visually. Exception: commit message bodies use one sentence per line for git log readability.
• Template hygiene: Delete (optional) and any parenthetical conditional label (e.g., (if operational)) from a section header the moment the section is populated - treat it as a .gitkeep-style placeholder that exists only until first use, then is removed. Omit the entire section (header and body) when unused. Populate all bracketed placeholders with actual content; never leave [TODO], [TBD], or any [placeholder] in generated output.
• Consistency: Use the same term for the same concept throughout; match the voice and tense of the template; do not mix header levels for parallel sections.
• KISS and DRY: Each section and bullet conveys unique information - no redundancy or overlap.

General Doc Constraints v1.2.0 - KemingHe/common-devx

Skill Constraints

• Self-contained: README makes sense without parent context
• 30-second rule: Purpose clear at first scan
• Non-recursive: Document THIS level only, link to subdirectory READMEs
• Pattern over listing: Consider documenting naming patterns for large directories
• Link to README.md: Use [Dir](../dir/README.md) not ../dir/
• Root README mode: Always confirm repo visibility (public/private) and platform (GitHub/GitLab) with user before generating a root README