Agent skill

Add Feature

by AlphaLab-USTC in AlphaLab-USTC/OhMyCode

Guide for adding a new feature to OhMyCode. An agent skill from AlphaLab-USTC/OhMyCode.

MITAuto-check passedTesting & QA

Install Add Feature

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/add-feature .claude/skills/add-feature && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .claude/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/add-feature .agents/skills/add-feature && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .agents/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/add-feature .cursor/skills/add-feature && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .cursor/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/AlphaLab-USTC/OhMyCode.git --path .agents/skills/add-feature

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/add-feature .gemini/skills/add-feature && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .gemini/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/add-feature .github/skills/add-feature && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .github/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install AlphaLab-USTC/OhMyCode add-feature --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlphaLab-USTC/OhMyCode.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/add-feature .opencode/skills/add-feature && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "add-feature" agent skill from https://github.com/AlphaLab-USTC/OhMyCode/tree/main/.agents/skills/add-feature into .opencode/skills/add-feature/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-feature", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: add-feature
GitHub stars: 131
Token cost: ~995 tokens
SKILL.md length: 453 words
Files: 1
Skills in repo: 10
Repo updated: Apr 2, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Guide for adding a new feature to OhMyCode. An agent skill from AlphaLab-USTC/OhMyCode.

Works in 6 steps: Understand the Request → Design the Architecture → Implement with TDD → …
User wants to add functionality that goes beyond existing extension points (tools/providers)
SKILL.md covers When to Use, IMPORTANT: Read First, Step-by-Step Guide and Architecture Constraints, plus 2 more sections
Calls python3

What it does

Add Feature is an agent skill from AlphaLab-USTC/OhMyCode. Guide for adding a new feature to OhMyCode. Use when user wants to add functionality that goes beyond existing extension points (tools/providers). Always start by reading docs/DEVELOPMENTGUIDE.md.

Its SKILL.md is about 1000 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA. The repository describes itself as: Minimal and Customizable CC-Style Coding Agent. The licence is MIT.

When your agent uses it

User wants to add functionality that goes beyond existing extension points (tools/providers)

Example prompts

“/add-feature”

Requirements

Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Understand the Request
Design the Architecture
Implement with TDD
Integrate
Update Documentation
Final Verification

What it can do on your machine

Read from SKILL.md and the folder at commit 4d1bb28. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Add Feature loads about 995 tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 453 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~52
When it runs · the whole SKILL.md, loaded when a task matches: ~995

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from AlphaLab-USTC/OhMyCode at commit 4d1bb28, republished under its MIT licence (© AlphaLab-USTC). 453 words, ~995 tokens.

Download SKILL.mdSave it as .claude/skills/add-feature/SKILL.md (or your agent's skills folder).

name: add-feature
description: Guide for adding a new feature to OhMyCode. Use when user wants to add functionality that goes beyond existing extension points (tools/providers). Always start by reading docs/DEVELOPMENT_GUIDE.md.

Add a New Feature to OhMyCode

Add a major new capability that isn't covered by existing extension points (add-tool, add-provider).

Examples: hook system, MCP support, multi-session management, plugin architecture, new CLI commands, new compression strategy.

When to Use

User wants a feature that requires new modules or modifying core modules
User says "add hook support", "add MCP", "add plugin system", etc.
The feature doesn't fit into the existing tool/provider/config pattern

IMPORTANT: Read First

Before doing anything, read docs/DEVELOPMENT_GUIDE.md — it contains:

Project architecture and module dependency graph
Code conventions (file size limits, naming, async patterns)
Testing conventions
Commit conventions

Step-by-Step Guide

Step 1: Understand the Request

Ask the user:

What does the feature do?
Who uses it? (end users via CLI? developers extending OhMyCode? both?)
What existing modules does it interact with?

Step 2: Design the Architecture

Based on docs/DEVELOPMENT_GUIDE.md, determine:

Where does the code go?
- New module under ohmycode/? (e.g., ohmycode/hooks/)
- Extends an existing module? (e.g., add to ohmycode/core/)
- Both?
What interfaces does it expose?
- New Protocol/ABC?
- New config options?
- New CLI commands/flags?
- New slash commands in REPL?
What existing code needs to change?
- Check the dependency graph in DEVELOPMENT_GUIDE.md
- Minimize changes to existing modules
- Never introduce circular imports
Propose the design to the user before writing code.

Step 3: Implement with TDD

For each component:

Write failing test in tests/<module>/test_<component>.py
Run test to confirm it fails
Implement the minimal code to pass
Run ALL tests to ensure no regressions: python3 -m pytest tests/ -v
Commit incrementally

Show full SKILL.md (194 more words)Show less

Step 4: Integrate

If the feature requires changes to existing modules:

Keep changes minimal and surgical
Prefer adding new functions over modifying existing ones
Use feature flags in config if the feature should be optional

Step 5: Update Documentation

Update docs/DEVELOPMENT_GUIDE.md if the feature:

Adds a new module to the architecture diagram
Creates a new extension point
Changes the module dependency graph
Adds new config options

Step 6: Final Verification

bash

python3 -m pytest tests/ -v                # All tests pass
ohmycode -p "Test the new feature" --mode auto  # End-to-end works

Architecture Constraints

From docs/DEVELOPMENT_GUIDE.md:

Single file < 500 lines — split if larger
Single function < 50 lines — extract helpers
No circular imports — check the dependency graph
Async-first — use async/await for I/O operations
Errors as values — return error results, don't raise exceptions in tool/provider code
Config for behavior — use config.json for user-facing settings, not hardcoded values

Module Dependency Rules

cli.py → core/loop.py → providers/base.py
                       → tools/base.py
                       → core/context.py
                       → core/system_prompt.py

New modules should fit into this hierarchy. Leaf modules (no dependencies on other ohmycode modules) are safest. Modules that need to touch core/loop.py require extra care.

Common Mistakes

Modifying core/loop.py without understanding the async generator pattern
Adding imports to permissions.py from tools/base.py (circular dependency)
Not updating DEVELOPMENT_GUIDE.md after adding a new module
Implementing without tests first
Making a feature mandatory when it should be optional (use config flags)

Files

Just SKILL.md in .agents/skills/add-feature of AlphaLab-USTC/OhMyCode.

Open the folder on GitHubat commit 4d1bb28

Compare with similar skills

Add Feature next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Add Feature compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Add Feature this skillAlphaLab-USTC/OhMyCode	131	—	~995	Automated safety check: Pass	MIT	6 mo ago
Web Application Testinganthropics/skills	180k	51 repos	~966	Automated safety check: Pass	Apache-2.0	today
Diagnosing Bugsfossasia/eventyay-interpretation	1.6k	32 repos	~2.1k	Automated safety check: Pass	Apache-2.0	4 days ago
TDDpietheinstrengholt/rssmonster	564	30 repos	~906	Automated safety check: Pass	MIT	yesterday
TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph	112	11 repos	~2.4k	Automated safety check: Pass	None	8 mo ago
TDDsanity-io/sanity	6.4k	20 repos	~1k	Automated safety check: Pass	MIT	today

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Questions about Add Feature

What does Add Feature do?

Guide for adding a new feature to OhMyCode. An agent skill from AlphaLab-USTC/OhMyCode. Add Feature is an agent skill from AlphaLab-USTC/OhMyCode. Guide for adding a new feature to OhMyCode.

When should I use Add Feature?

Add Feature fits situations like: user wants to add functionality that goes beyond existing extension points (tools/providers).

How do I install Add Feature in Claude Code?

Run `npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a claude-code`. Or copy the skill folder (.agents/skills/add-feature in AlphaLab-USTC/OhMyCode) into .claude/skills/add-feature in your project. Claude Code loads it when a task matches its description.

How do I install Add Feature in Codex?

Run `npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a codex`. Or copy the skill folder (.agents/skills/add-feature in AlphaLab-USTC/OhMyCode) into .agents/skills/add-feature in your project. Codex loads it when a task matches its description.

Can I use Add Feature in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add AlphaLab-USTC/OhMyCode --skill add-feature -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/add-feature, .gemini/skills/add-feature, .github/skills/add-feature and .opencode/skills/add-feature in your project.

What does Add Feature need to run?

Going by SKILL.md and its folder, Add Feature needs the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Add Feature access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Add Feature safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Add Feature use?

Add Feature is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Add Feature use?

About 995 tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Add Feature?

Skills that share tags, products or a category with Add Feature: Web Application Testing (anthropics/skills, 180k stars), Diagnosing Bugs (fossasia/eventyay-interpretation, 1.6k stars), TDD (pietheinstrengholt/rssmonster, 564 stars) and TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Add Feature?

AlphaLab-USTC (a GitHub user) maintains it in AlphaLab-USTC/OhMyCode, which has 131 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on April 2, 2026.

Source: AlphaLab-USTC/OhMyCode on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Add Feature

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Add a New Feature to OhMyCode

When to Use

IMPORTANT: Read First

Step-by-Step Guide

Step 1: Understand the Request

Step 2: Design the Architecture

Step 3: Implement with TDD

Step 4: Integrate

Step 5: Update Documentation

Step 6: Final Verification

Architecture Constraints

Module Dependency Rules

Common Mistakes

Files

Compare with similar skills

Similar skills

More from AlphaLab-USTC/OhMyCode

Related

Questions about Add Feature