ast-grep Codemod Reference
warp-drive-data/warp-drive
Reference for writing and debugging TypeScript and JavaScript codemods with @ast-grep/napi: parsing, node queries, meta-variables, rule objects and editing.
Apply when creating, modifying, refactoring, debugging, testing, or reviewing TypeScript and Node.js code under bff/ in chat-gun.
Install Chat Gun Bff Contract
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install HsienW/chat-gun chat-gun-bff-contract --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .claude/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.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/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .claude/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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 install https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contractType 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.
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install HsienW/chat-gun chat-gun-bff-contract --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .agents/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .agents/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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.
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install HsienW/chat-gun chat-gun-bff-contract --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .cursor/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .cursor/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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 https://github.com/HsienW/chat-gun.git --path .agents/skills/chat-gun-bff-contract--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install HsienW/chat-gun chat-gun-bff-contract --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .gemini/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.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/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .gemini/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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.
$ gh skill install HsienW/chat-gun chat-gun-bff-contractInstalls 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).
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .github/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.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/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .github/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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.
$ npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install HsienW/chat-gun chat-gun-bff-contract --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HsienW/chat-gun.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/chat-gun-bff-contract .opencode/skills/chat-gun-bff-contract && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "chat-gun-bff-contract" agent skill from https://github.com/HsienW/chat-gun/tree/master/.agents/skills/chat-gun-bff-contract into .opencode/skills/chat-gun-bff-contract/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "chat-gun-bff-contract", 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
chat-gun-bff-contract- GitHub stars
- 143
- Token cost
- ~2.6k tokens
- SKILL.md length
- 1,182 words
- Files
- 1
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Apply when creating, modifying, refactoring, debugging, testing, or reviewing TypeScript and Node.js code under bff/ in chat-gun.
- Works in 6 steps: Approved OpenSpec proposal, specs,… → Root AGENTS.md → bff/AGENTS.md → …
- Tasks that involve Internationalization
- SKILL.md covers Instruction precedence, Existing stack must be preserved, BFF ownership and Skill routing, plus 12 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Chat Gun Bff Contract is an agent skill from HsienW/chat-gun. Apply when creating, modifying, refactoring, debugging, testing, or reviewing TypeScript and Node.js code under bff/ in chat-gun. Enforces transport boundaries, naming, imports, validation, streaming, timeout, cancellation, security, observability, internationalization, and legacy-code compatibility.
Its SKILL.md is about 2.6k 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 Development, covering Internationalization, Legacy modernization and Observability. It works with TypeScript, Node.js and LangGraph. The repository describes itself as: 🤖 A full-stack Agent Chat Runtime for pre-production validation, built with act, TypeScript, and LangGraph JS combining streaming, multimodal, HITL, and tools with durable…
When your agent uses it
- Tasks that involve Internationalization
- Tasks that involve Legacy modernization
- Tasks that involve Observability
Example prompts
- “/chat-gun-bff-contract”
Requirements
- Node.js
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Approved OpenSpec proposal, specs, design, and tasks
- Root AGENTS.md
- bff/AGENTS.md
- Existing public contracts, tests, and accepted runtime behavior
- This skill
- External general-purpose skills
What it can do on your machine
Read from SKILL.md and the folder at commit 4569cb0. 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
No scripts in the folder and no shell commands in SKILL.md.
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
Chat Gun Bff Contract loads about 2.6k tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 1,182 words of instructions outside code blocks.
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,182 words (~2,600 tokens).
- name
- chat-gun-bff-contract
Files
Just SKILL.md in .agents/skills/chat-gun-bff-contract of HsienW/chat-gun.
Open the folder on GitHubat commit 4569cb0
Compare with similar skills
Chat Gun Bff Contract 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Chat Gun Bff Contract this skillHsienW/chat-gun | 143 | — | ~2.6k | Automated safety check: Pass | Custom licence | |
| ast-grep Codemod Referencewarp-drive-data/warp-drive | 3.2k | — | ~2.6k | Automated safety check: Pass | MIT | |
| Effect TSmattiacerutti/supernova | 185 | — | ~2.8k | Automated safety check: Pass | MIT | |
| Code Reviewespennilsen/pi | 122 | — | ~771 | Automated safety check: Pass | MIT | |
| Lokalise SDK Patternsjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~3k | Automated safety check: Pass | MIT | |
| Effect TSpproenca/dot-skills | 215 | — | ~2k | Automated safety check: Pass | MIT |
Similar skills
Effect TS
mattiacerutti/supernova
Write idiomatic Effect v4 TypeScript following official best practices from effect-solutions and the Effect source.
Code Review
espennilsen/pi
Review code for quality, security, performance, and maintainability.
Lokalise SDK Patterns
jeremylongshore/tons-of-skills-marketplace
Apply production-ready Lokalise SDK patterns for TypeScript and Node.js.
Effect TS
pproenca/dot-skills
Effect-TS library usage in TypeScript — Effect.gen generators, Schema.Struct/Schema.Class definitions, Layer/Context.Tag/Service patterns, Effect.pipe pipelines, Data.TaggedError/Data.Class error…
Failproof AI SDK Integration
FailproofAI/failproofai
Helps instrument a custom Python or TypeScript agent to record events for Failproof AI, verify what gets written, and run an evaluator worker that scores the runs.
More from HsienW/chat-gun
All 8 skills in this repoChat Gun Frontend Contract
HsienW/chat-gun
Chat Gun 的前端、OpenSpec、Streaming Event、Tool Renderer、型別邊界、多模態流式鏈路與 React/Vite 編程約束。Use when working on frontend code, tool rendering, streaming contracts, multimodal requests/responses, Weather…
Node
HsienW/chat-gun
Provides domain-specific best practices for Node.js development with TypeScript, covering type stripping, async patterns, error handling, streams, modules, testing, performance, caching, logging…
Openspec Workflow Router
HsienW/chat-gun
MUST be considered at task start in this repository to detect OpenSpec change lifecycle work and route Claude Code/CCR coordination tasks without loading unnecessary context.
Openspec Workflow Router
HsienW/chat-gun
MUST be considered at task start in this repository to detect OpenSpec change lifecycle work and route it to token-efficient stage prompts.
Openspec Workflow Router
HsienW/chat-gun
MUST be considered at task start in this repository to detect OpenSpec change lifecycle work and route Qwen Code review tasks without loading unnecessary context.
Secondary Architecture Reviewer
HsienW/chat-gun
對 OpenSpec、Git Diff、frontend、bff、backend、LangGraph、Tool、MCP 與安全邊界進行獨立唯讀審查，輸出 Blocker、Major、Minor 與標準 Verdict。
Related
Works with
Categories
Questions about Chat Gun Bff Contract
What does Chat Gun Bff Contract do?
Apply when creating, modifying, refactoring, debugging, testing, or reviewing TypeScript and Node.js code under bff/ in chat-gun. Chat Gun Bff Contract is an agent skill from HsienW/chat-gun.js code under bff/ in chat-gun.
When should I use Chat Gun Bff Contract?
Chat Gun Bff Contract fits situations like: tasks that involve Internationalization; tasks that involve Legacy modernization; tasks that involve Observability.
How do I install Chat Gun Bff Contract in Claude Code?
Run `npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a claude-code`. Or copy the skill folder (.agents/skills/chat-gun-bff-contract in HsienW/chat-gun) into .claude/skills/chat-gun-bff-contract in your project. Claude Code loads it when a task matches its description.
How do I install Chat Gun Bff Contract in Codex?
Run `npx skills add HsienW/chat-gun --skill chat-gun-bff-contract -a codex`. Or copy the skill folder (.agents/skills/chat-gun-bff-contract in HsienW/chat-gun) into .agents/skills/chat-gun-bff-contract in your project. Codex loads it when a task matches its description.
Can I use Chat Gun Bff Contract 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 HsienW/chat-gun --skill chat-gun-bff-contract -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/chat-gun-bff-contract, .gemini/skills/chat-gun-bff-contract, .github/skills/chat-gun-bff-contract and .opencode/skills/chat-gun-bff-contract in your project.
What does Chat Gun Bff Contract need to run?
SKILL.md names no scripts, command-line tools or credentials: Chat Gun Bff Contract is instructions for the agent only. Our summary lists: Node.js.
Does Chat Gun Bff Contract 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 Chat Gun Bff Contract 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 Chat Gun Bff Contract use?
Chat Gun Bff Contract has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Chat Gun Bff Contract use?
About 2.6k tokens (SKILL.md is roughly 10k 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 Chat Gun Bff Contract?
Skills that share tags, products or a category with Chat Gun Bff Contract: ast-grep Codemod Reference (warp-drive-data/warp-drive, 3.2k stars), Effect TS (mattiacerutti/supernova, 185 stars), Code Review (espennilsen/pi, 122 stars) and Lokalise SDK Patterns (jeremylongshore/tons-of-skills-marketplace, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Chat Gun Bff Contract?
HsienW (a GitHub user) maintains it in HsienW/chat-gun, which has 143 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 4, 2026.
Source: HsienW/chat-gun on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.