Agent skill

Patch Creation

Create and register new patches for tweakcc. An agent skill from Piebald-AI/tweakcc.

MITAuto-check passedAI & LLM Engineering

Install Patch Creation

skills CLI

$ npx skills add Piebald-AI/tweakcc --skill patch-creation -a claude-code

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

GitHub CLI

$ gh skill install Piebald-AI/tweakcc patch-creation --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/Piebald-AI/tweakcc.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/patch-creation .claude/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .claude/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation

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 Piebald-AI/tweakcc --skill patch-creation -a codex

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

GitHub CLI

$ gh skill install Piebald-AI/tweakcc patch-creation --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/Piebald-AI/tweakcc.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/patch-creation .agents/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .agents/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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 Piebald-AI/tweakcc --skill patch-creation -a cursor

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

GitHub CLI

$ gh skill install Piebald-AI/tweakcc patch-creation --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/Piebald-AI/tweakcc.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/patch-creation .cursor/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .cursor/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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/Piebald-AI/tweakcc.git --path .claude/skills/patch-creation

--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 Piebald-AI/tweakcc --skill patch-creation -a gemini-cli

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

GitHub CLI

$ gh skill install Piebald-AI/tweakcc patch-creation --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/Piebald-AI/tweakcc.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/patch-creation .gemini/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .gemini/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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 Piebald-AI/tweakcc patch-creation

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 Piebald-AI/tweakcc --skill patch-creation -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/Piebald-AI/tweakcc.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/patch-creation .github/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .github/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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 Piebald-AI/tweakcc --skill patch-creation -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 Piebald-AI/tweakcc patch-creation --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/Piebald-AI/tweakcc.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/patch-creation .opencode/skills/patch-creation && 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 "patch-creation" agent skill from https://github.com/Piebald-AI/tweakcc/tree/main/.claude/skills/patch-creation into .opencode/skills/patch-creation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "patch-creation", 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: patch-creation
GitHub stars: 2.5k
Token cost: ~1.6k tokens
SKILL.md length: 367 words
Files: 1
Skills in repo: 1
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Create and register new patches for tweakcc. An agent skill from Piebald-AI/tweakcc.

Works in 5 steps: Create the patch file → Add config type (if patch is configurable) → Add default value → …
Adding new customizations to Claude Code
SKILL.md covers Overview, Creating a New Patch, Key Files and Registration Checklist, plus 5 more sections
Calls npm and npx

What it does

Patch Creation is an agent skill from Piebald-AI/tweakcc. Create and register new patches for tweakcc. Use when adding new customizations to Claude Code.

Its SKILL.md is about 1.6k 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 AI & LLM Engineering, covering Prompt engineering. The repository describes itself as: Customize Claude Code's system prompts, create custom toolsets, input pattern highlighters, themes/thinking verbs/spinners, customize input box & user message styling, support… The licence is MIT.

When your agent uses it

Adding new customizations to Claude Code
Tasks that involve Prompt engineering

Example prompts

“/patch-creation”

Requirements

Node.js

Workflow steps

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

Create the patch file
Add config type (if patch is configurable)
Add default value
Register in index.ts
Add UI (optional)

What it can do on your machine

Read from SKILL.md and the folder at commit 5574fb4. 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:
- npm
- npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm and npx, which can reach the network depending on how they are called.
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

Patch Creation loads about 1.6k tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 367 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~28
When it runs · the whole SKILL.md, loaded when a task matches: ~1.6k

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 Piebald-AI/tweakcc at commit 5574fb4, republished under its MIT licence (© Piebald-AI). 367 words, ~1,564 tokens.

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

name: patch-creation
description: Create and register new patches for tweakcc. Use when adding new customizations to Claude Code.

Patch Creation & Registration

Overview

Patches are code modifications applied to Claude Code's cli.js (or native binary). Each patch finds specific patterns in the minified code and replaces/injects new behavior.

Creating a New Patch

1. Create the patch file

Create src/patches/myPatch.ts:

typescript

// Please see the note about writing patches in ./index

import { showDiff } from './index';

/**
 * Description of what this patch does.
 *
 * CC X.Y.Z:
 * ```diff
 *  // Show before/after of the code change
 * -oldCode
 * +newCode
 * ```
 */
export const writeMyPatch = (
  file: string,
  configValue: string // Add parameters as needed
): string | null => {
  // Pattern to find in minified code
  // IMPORTANT: Use [$\w]+ for identifiers (not \w+) because $ is valid in JS identifiers
  // IMPORTANT: Start patterns with a boundary char (,;}{) for HIGH performance (e.g. 1.5s -> 30ms)
  const pattern = /,somePattern([$\w]+)/;

  const match = file.match(pattern);

  if (!match || match.index === undefined) {
    console.error('patch: myPatch: failed to find pattern');
    return null;
  }

  const replacement = `,newCode${match[1]}`;

  const startIndex = match.index;
  const endIndex = startIndex + match[0].length;

  const newFile =
    file.slice(0, startIndex) + replacement + file.slice(endIndex);

  showDiff(file, newFile, replacement, startIndex, endIndex);

  return newFile;
};

2. Add config type (if patch is configurable)

Edit src/types.ts - add to MiscConfig or create a new interface:

typescript

export interface MiscConfig {
  // ... existing fields ...
  myNewSetting: string | null; // null = disabled
}

3. Add default value

Edit src/defaultSettings.ts:

typescript

misc: {
  // ... existing fields ...
  myNewSetting: null,  // or a sensible default
},

4. Register in index.ts

Edit src/patches/index.ts:

4a. Add import:

typescript

import { writeMyPatch } from './myPatch';

4b. Add patch definition (in PATCH_DEFINITIONS array):

typescript

{
  id: 'my-patch',
  name: 'My patch',
  group: PatchGroup.FEATURES,  // or ALWAYS_APPLIED, MISC_CONFIGURABLE
  description: 'What this patch does for the user',
},

4c. Add patch implementation (in patchImplementations object):

typescript

'my-patch': {
  fn: c => writeMyPatch(c, config.settings.misc!.myNewSetting!),
  condition: !!config.settings.misc?.myNewSetting,
},

5. Add UI (optional)

Edit src/ui/components/MiscView.tsx to add a toggle or input for the setting.

Key Files

File	Purpose
`src/patches/*.ts`	Individual patch implementations
`src/patches/index.ts`	Patch registry, definitions, and application logic
`src/types.ts`	Config type definitions (`MiscConfig`, etc.)
`src/defaultSettings.ts`	Default values for all settings
`src/ui/components/MiscView.tsx`	UI for misc settings

Registration Checklist

When adding a new patch, update these locations:

src/patches/myPatch.ts - Create the patch file with exported function
src/types.ts - Add config type (if configurable)
src/defaultSettings.ts - Add default value (if configurable)
src/patches/index.ts:
- Import the patch function
- Add to PATCH_DEFINITIONS array (id, name, group, description)
- Add to patchImplementations object (fn, condition)
src/ui/components/MiscView.tsx - Add UI controls (optional)

Patch Groups

PatchGroup.ALWAYS_APPLIED - Core patches that are always applied
PatchGroup.MISC_CONFIGURABLE - User-configurable misc settings
PatchGroup.FEATURES - Feature patches that can be enabled/disabled

Show full SKILL.md (159 more words)Show less

Pattern Writing Tips

Use [$\w]+ for identifiers - Not \w+, because $ is valid in JS identifiers and common in minified code
Start patterns with boundary characters - Use ,, ;, {, } at the start to dramatically speed up matching (can reduce 1.5s to 30ms)
Don't use \b for word boundaries - It doesn't treat $ as a word character, so \b[$\w]+ won't match ,$=
Extract function bodies carefully - Count braces to find matching } when you need the full function
Use showDiff() for debugging - Always call it to log what the patch is changing
Return null on failure - Let the patch system know the patch couldn't be applied
Handle multiple CC versions - Code patterns may change between versions; try multiple patterns if needed

Example: Simple Toggle Patch

typescript

// Bypass a feature flag check
const pattern = /function [$\w]+\(\)\{return [$\w]+\("my_feature_flag"/;
const match = file.match(pattern);

if (!match || match.index === undefined) {
  console.error('patch: myPatch: failed to find feature flag');
  return null;
}

const insertIndex = match.index + match[0].indexOf('{') + 1;
const insertion = 'return true;';

const newFile =
  file.slice(0, insertIndex) + insertion + file.slice(insertIndex);

showDiff(file, newFile, insertion, insertIndex, insertIndex);
return newFile;

Example: Replace a Value

typescript

// Replace a hardcoded value
const pattern = /(someConfig=)\d+(;)/;
const match = file.match(pattern);

if (!match || match.index === undefined) {
  console.error('patch: myPatch: failed to find config value');
  return null;
}

const replacement = match[1] + newValue + match[2];
const startIndex = match.index;
const endIndex = startIndex + match[0].length;

const newFile = file.slice(0, startIndex) + replacement + file.slice(endIndex);

showDiff(file, newFile, replacement, startIndex, endIndex);
return newFile;

Testing

Run npm run build to compile
Run npx tweakcc --apply to apply patches
Check console output for patch success/failure
Run Claude Code to verify behavior

Files

Just SKILL.md in .claude/skills/patch-creation of Piebald-AI/tweakcc.

Open the folder on GitHubat commit 5574fb4

Compare with similar skills

Patch Creation 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.

Patch Creation compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Patch Creation this skillPiebald-AI/tweakcc	2.5k	—	~1.6k	Automated safety check: Pass	MIT	today
Prompt Improverseverity1/claude-code-prompt-improver	1.9k	2 repos	~1.7k	Automated safety check: Pass	MIT	6 days ago
Prompt Engineering Patternsynulihao/AgentSkillOS	617	14 repos	~1.7k	Automated safety check: Pass	None	7 mo ago
LLM Application DevMoizIbnYousaf/ai-agent-skills	1.1k	2 repos	~1.3k	Automated safety check: Pass	MIT	16 days ago
Senior Prompt Engineermaslennikov-ig/claude-code-orchestrator-kit	259	4 repos	~1.4k	Automated safety check: Pass	Custom licence	7 mo ago
Codex Fable5baskduf/FableCodex	437	—	~1.6k	Automated safety check: Pass	AGPL-3.0	2 mo ago

Similar skills

Prompt Improver
severity1/claude-code-prompt-improver
This skill enriches vague prompts with targeted research and clarification before execution.
1.9k GitHub starsUsed in 2 repos~1.7k tokens
AI & LLM EngineeringAuto-check passed
Prompt Engineering Patterns
ynulihao/AgentSkillOS
Master advanced prompt engineering techniques to maximize LLM performance, reliability, and controllability in production.
617 GitHub starsUsed in 14 repos~1.7k tokens
AI & LLM EngineeringAuto-check passed
LLM Application Dev
MoizIbnYousaf/ai-agent-skills
Building applications with Large Language Models - prompt engineering, RAG patterns, and LLM integration.
1.1k GitHub starsUsed in 2 repos~1.3k tokens
AI & LLM EngineeringAuto-check passed
Senior Prompt Engineer
maslennikov-ig/claude-code-orchestrator-kit
Provides reference guides and Python scripts for prompt optimization, RAG evaluation, and agent orchestration when building or tuning LLM systems.
259 GitHub starsUsed in 4 repos~1.4k tokens
AI & LLM EngineeringAuto-check passed
Codex Fable5
baskduf/FableCodex
Apply a Claude Fable 5 inspired operating style inside Codex.
437 GitHub stars~1.6k tokensUpdated 2 mo ago
AI & LLM EngineeringAuto-check passed
Prompt Engineering Patterns
wshobson/agents
Reference for designing and tuning production LLM prompts: few-shot examples, chain-of-thought, structured outputs, templates and system prompts.
40k GitHub stars~1.3k tokensUpdated 2 days ago
AI & LLM EngineeringAuto-check passed

Questions about Patch Creation

What does Patch Creation do?

Create and register new patches for tweakcc. An agent skill from Piebald-AI/tweakcc. Patch Creation is an agent skill from Piebald-AI/tweakcc. Create and register new patches for tweakcc.

When should I use Patch Creation?

Patch Creation fits situations like: adding new customizations to Claude Code; tasks that involve Prompt engineering.

How do I install Patch Creation in Claude Code?

Run `npx skills add Piebald-AI/tweakcc --skill patch-creation -a claude-code`. Or copy the skill folder (.claude/skills/patch-creation in Piebald-AI/tweakcc) into .claude/skills/patch-creation in your project. Claude Code loads it when a task matches its description.

How do I install Patch Creation in Codex?

Run `npx skills add Piebald-AI/tweakcc --skill patch-creation -a codex`. Or copy the skill folder (.claude/skills/patch-creation in Piebald-AI/tweakcc) into .agents/skills/patch-creation in your project. Codex loads it when a task matches its description.

Can I use Patch Creation 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 Piebald-AI/tweakcc --skill patch-creation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/patch-creation, .gemini/skills/patch-creation, .github/skills/patch-creation and .opencode/skills/patch-creation in your project.

What does Patch Creation need to run?

Going by SKILL.md and its folder, Patch Creation needs the command-line tools its instructions call (npm and npx). Our summary lists: Node.js.

Does Patch Creation access the network?

SKILL.md contains no URLs. Its commands use npm and npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Patch Creation 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 Patch Creation use?

Patch Creation 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 Patch Creation use?

About 1.6k tokens (SKILL.md is roughly 6.3k 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 Patch Creation?

Skills that share tags, products or a category with Patch Creation: Prompt Improver (severity1/claude-code-prompt-improver, 1.9k stars), Prompt Engineering Patterns (ynulihao/AgentSkillOS, 617 stars), LLM Application Dev (MoizIbnYousaf/ai-agent-skills, 1.1k stars) and Senior Prompt Engineer (maslennikov-ig/claude-code-orchestrator-kit, 259 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Patch Creation?

Piebald-AI (a GitHub organization) maintains it in Piebald-AI/tweakcc, which has 2,534 GitHub stars. The repository was last updated on October 6, 2026.

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

Install Patch Creation

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

Patch Creation & Registration

Overview

Creating a New Patch

1. Create the patch file

2. Add config type (if patch is configurable)

3. Add default value

4. Register in index.ts

5. Add UI (optional)

Key Files

Registration Checklist

Patch Groups

Pattern Writing Tips

Example: Simple Toggle Patch

Example: Replace a Value

Testing

Files

Compare with similar skills

Similar skills

Prompt Improver

Prompt Engineering Patterns

LLM Application Dev

Senior Prompt Engineer

Codex Fable5

Prompt Engineering Patterns

Related

Questions about Patch Creation