Cloudflare Workers
einverne/dotfiles
Comprehensive guide for building serverless applications with Cloudflare Workers.
Multi-language Workers development with Rust, Python, and WebAssembly.
MITAuto-check passed
Install Cloudflare Workers Multi Lang
$ npx skills add secondsky/claude-skills --skill cloudflare-workers-multi-lang -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install secondsky/claude-skills cloudflare-workers-multi-lang --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/secondsky/claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .claude/skills/cloudflare-workers-multi-lang && 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 "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .claude/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-langType 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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install secondsky/claude-skills cloudflare-workers-multi-lang --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .agents/skills/cloudflare-workers-multi-lang && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .agents/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install secondsky/claude-skills cloudflare-workers-multi-lang --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .cursor/skills/cloudflare-workers-multi-lang && 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 "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .cursor/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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/secondsky/claude-skills.git --path plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang--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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install secondsky/claude-skills cloudflare-workers-multi-lang --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .gemini/skills/cloudflare-workers-multi-lang && 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 "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .gemini/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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 secondsky/claude-skills cloudflare-workers-multi-langInstalls 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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .github/skills/cloudflare-workers-multi-lang && 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 "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .github/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install secondsky/claude-skills cloudflare-workers-multi-lang --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang .opencode/skills/cloudflare-workers-multi-lang && 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 "cloudflare-workers-multi-lang" agent skill from https://github.com/secondsky/claude-skills/tree/main/plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang into .opencode/skills/cloudflare-workers-multi-lang/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloudflare-workers-multi-lang", 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
cloudflare-workers-multi-lang- GitHub stars
- 227
- Token cost
- ~1.3k tokens
- SKILL.md length
- 246 words
- Files
- 9 (incl. scripts, references)
- Skills in repo
- 169
- Repo updated
- First seen
- Licence
- MIT
At a glance
Multi-language Workers development with Rust, Python, and WebAssembly.
- Works in 5 steps: WASM Initialization: Cache instance, use… → Memory: Use typed arrays for data transfer → Bundle Size: Enable LTO, strip debug info → …
- Building Workers in languages other than JavaScript/TypeScript
- SKILL.md covers Language Comparison, Quick Decision, Top 10 Multi-Lang Errors and Rust Quick Start, plus 5 more sections
- Runs Shell, Python, Rust and TypeScript scripts from its folder; calls cargo and python
What it does
Cloudflare Workers Multi Lang is an agent skill from secondsky/claude-skills. Multi-language Workers development with Rust, Python, and WebAssembly. Use when building Workers in languages other than JavaScript/TypeScript, or when integrating WASM modules for performance-critical code.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts and reference files (for example `references/python-workers.md`, `references/rust-workers.md` and `references/wasm-integration.md`).
It works with WebAssembly, Rust, Python and Cloudflare Workers. The repository describes itself as: Production-ready skills for Claude Code CLI - Cloudflare, React, Tailwind v4, and AI integrations. The licence is MIT.
When your agent uses it
- Building Workers in languages other than JavaScript/TypeScript
- Integrating WASM modules for performance-critical code
Example prompts
- “/cloudflare-workers-multi-lang”
Requirements
- Python 3
- Node.js
- A Bash shell
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- WASM Initialization: Cache instance, use streaming
- Memory: Use typed arrays for data transfer
- Bundle Size: Enable LTO, strip debug info
- Cold Starts: Keep WASM modules small
- Data Transfer: Minimize JS/WASM boundary crossings
What it can do on your machine
Read from SKILL.md and the folder at commit 8837836. 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
Ships 2 files in scripts/ (Shell, Python, Rust and TypeScript), which the agent can run.
Shell commands in SKILL.md call:
cargopython
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
Cloudflare Workers Multi Lang loads about 1.3k tokens when it runs, and up to ~10k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 246 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); the scripts in this folder are not scanned.
SKILL.md
The full file from secondsky/claude-skills at commit 8837836, republished under its MIT licence (© secondsky). 246 words, ~1,280 tokens.
Download SKILL.mdSave it as
.claude/skills/cloudflare-workers-multi-lang/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.- name
- cloudflare-workers-multi-lang
- description
- Multi-language Workers development with Rust, Python, and WebAssembly. Use when building Workers in languages other than JavaScript/TypeScript, or when integrating WASM modules for performance-critical code.
- metadata.version
- 1.0.0
- license
- MIT
Multi-Language Workers Development
Build Cloudflare Workers using Rust, Python, or WebAssembly for performance-critical operations.
Language Comparison
| Feature | JavaScript/TS | Rust | Python |
|---|---|---|---|
| Startup | Fast | Fastest (WASM) | Moderate |
| CPU Perf | Good | Excellent | Good |
| Memory | Higher | Lower | Higher |
| Bundle Size | Smaller | Medium | Larger |
| Type Safety | Optional (TS) | Strict | Optional |
| Best For | General apps | CPU-intensive | Data/ML |
Quick Decision
Need maximum performance? → Rust/WASM
Heavy computation (crypto, image processing)? → Rust/WASM
Data processing, ML inference? → Python
General web apps? → JavaScript/TypeScriptTop 10 Multi-Lang Errors
| Error | Language | Cause | Solution |
|---|---|---|---|
WebAssembly.instantiate() failed | Rust | Invalid WASM | Check wasm-pack build output |
Module parse failed: Unexpected token | Rust | ESM/CJS mismatch | Use --target bundler |
Cannot find module | Python | Missing dep | Add to pyproject.toml |
Out of memory | All | Large WASM | Enable streaming instantiation |
Exceeded CPU time limit | All | Long computation | Chunk processing |
wasm-bindgen version mismatch | Rust | Dep conflict | Align versions in Cargo.toml |
RuntimeError: unreachable | Rust | Panic in WASM | Add proper error handling |
TypeError: not a function | Rust | Missing export | Add #[wasm_bindgen] attribute |
Python worker startup timeout | Python | Slow init | Minimize imports |
SharedArrayBuffer not supported | All | Security | Add COOP/COEP headers |
Rust Quick Start
# Install tools
cargo install wasm-pack
# Create project
cargo new --lib my-worker
cd my-worker
# Add to Cargo.toml
cat >> Cargo.toml << 'EOF'
[lib]
crate-type = ["cdylib"]
[dependencies]
wasm-bindgen = "0.2"
worker = "0.3"
console_error_panic_hook = "0.1"
[profile.release]
opt-level = "s"
lto = true
EOF// src/lib.rs
use worker::*;
#[event(fetch)]
async fn fetch(req: Request, env: Env, _ctx: Context) -> Result<Response> {
console_error_panic_hook::set_once();
Router::new()
.get("/", |_, _| Response::ok("Hello from Rust!"))
.get("/compute", |_, _| {
// CPU-intensive computation
let result = heavy_computation();
Response::ok(format!("Result: {}", result))
})
.run(req, env)
.await
}
fn heavy_computation() -> u64 {
(1..1_000_000).filter(|n| is_prime(*n)).count() as u64
}
fn is_prime(n: u64) -> bool {
if n < 2 { return false; }
(2..=(n as f64).sqrt() as u64).all(|i| n % i != 0)
}Python Quick Start (Workers for Platforms)
# pyproject.toml
[project]
name = "my-worker"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = []
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"# src/entry.py
from js import Response, Headers
async def on_fetch(request, env):
url = request.url
if "/compute" in url:
result = heavy_computation()
return Response.new(f"Result: {result}")
return Response.new("Hello from Python!")
def heavy_computation():
"""CPU-intensive computation"""
return sum(1 for n in range(2, 100000) if is_prime(n))
def is_prime(n):
if n < 2:
return False
return all(n % i != 0 for i in range(2, int(n**0.5) + 1))WASM Module Integration
// Load and use WASM module in TypeScript Worker
import wasmModule from './pkg/my_lib_bg.wasm';
import { init, process_data } from './pkg/my_lib';
let wasmInstance: WebAssembly.Instance;
export default {
async fetch(request: Request, env: Env): Promise<Response> {
// Initialize WASM once
if (!wasmInstance) {
wasmInstance = await WebAssembly.instantiate(wasmModule);
init();
}
// Use WASM function
const result = process_data(inputData);
return Response.json({ result });
},
};When to Load References
| Reference | Load When |
|---|---|
references/rust-workers.md | Building Workers with Rust/WASM |
references/python-workers.md | Using Python on Workers for Platforms |
references/wasm-integration.md | Integrating WASM modules in any Worker |
Performance Tips
- WASM Initialization: Cache instance, use streaming
- Memory: Use typed arrays for data transfer
- Bundle Size: Enable LTO, strip debug info
- Cold Starts: Keep WASM modules small
- Data Transfer: Minimize JS/WASM boundary crossings
See Also
workers-performance- General optimization techniquesworkers-testing- Testing multi-language Workerscloudflare-worker-base- Basic Workers setup
© secondsky, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 8 other files (scripts, references) in plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang of secondsky/claude-skills.
- SKILL.md
- references/python-workers.md
- references/rust-workers.md
- references/wasm-integration.md
- scripts/build-rust.sh
- scripts/build-wasm.sh
- templates/python-worker.py
- templates/rust-worker.rs
- templates/wasm-worker.ts
Open the folder on GitHubat commit 8837836
Compare with similar skills
Cloudflare Workers Multi Lang 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 |
|---|---|---|---|---|---|---|
| Cloudflare Workers Multi Lang this skillsecondsky/claude-skills | 227 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Cloudflare Workerseinverne/dotfiles | 121 | — | ~8.4k | Automated safety check: Pass | MIT | |
| jscpd Code Migration Trackerkucherenko/jscpd | 6.3k | — | ~5k | Automated safety check: Pass | MIT | |
| Cross-Language Coding Standardszereight/gitlab-mcp | 2k | 1 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Crossbindcrossbind/crossbind | 148 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Language Supportlive-codes/livecodes | 1.5k | — | ~1.6k | Automated safety check: Pass | MIT |
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Shared reference for naming, function size, complexity and error handling rules that reviewer agents apply across TypeScript, Python, Go, Rust, Java, C# and Swift.
Crossbind
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Work with 90+ supported languages, compilers, CSS processors, and WASM-compiled languages for markup, style, and script editors.
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Related
Questions about Cloudflare Workers Multi Lang
What does Cloudflare Workers Multi Lang do?
Multi-language Workers development with Rust, Python, and WebAssembly. Cloudflare Workers Multi Lang is an agent skill from secondsky/claude-skills. Multi-language Workers development with Rust, Python, and WebAssembly.
When should I use Cloudflare Workers Multi Lang?
Cloudflare Workers Multi Lang fits situations like: building Workers in languages other than JavaScript/TypeScript; integrating WASM modules for performance-critical code.
How do I install Cloudflare Workers Multi Lang in Claude Code?
Run `npx skills add secondsky/claude-skills --skill cloudflare-workers-multi-lang -a claude-code`. Or copy the skill folder (plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang in secondsky/claude-skills) into .claude/skills/cloudflare-workers-multi-lang in your project. Claude Code loads it when a task matches its description.
How do I install Cloudflare Workers Multi Lang in Codex?
Run `npx skills add secondsky/claude-skills --skill cloudflare-workers-multi-lang -a codex`. Or copy the skill folder (plugins/cloudflare-workers/skills/cloudflare-workers-multi-lang in secondsky/claude-skills) into .agents/skills/cloudflare-workers-multi-lang in your project. Codex loads it when a task matches its description.
Can I use Cloudflare Workers Multi Lang 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 secondsky/claude-skills --skill cloudflare-workers-multi-lang -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cloudflare-workers-multi-lang, .gemini/skills/cloudflare-workers-multi-lang, .github/skills/cloudflare-workers-multi-lang and .opencode/skills/cloudflare-workers-multi-lang in your project.
What does Cloudflare Workers Multi Lang need to run?
Going by SKILL.md and its folder, Cloudflare Workers Multi Lang needs a shell, Python, Rust and TypeScript for the scripts in its folder and the command-line tools its instructions call (cargo and python). Our summary lists: Python 3; Node.js; A Bash shell.
Does Cloudflare Workers Multi Lang 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 Cloudflare Workers Multi Lang 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Cloudflare Workers Multi Lang use?
Cloudflare Workers Multi Lang is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Cloudflare Workers Multi Lang use?
About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 9k tokens, read only when the agent opens those files.
What are the alternatives to Cloudflare Workers Multi Lang?
Skills that share tags, products or a category with Cloudflare Workers Multi Lang: Cloudflare Workers (einverne/dotfiles, 121 stars), jscpd Code Migration Tracker (kucherenko/jscpd, 6.3k stars), Cross-Language Coding Standards (zereight/gitlab-mcp, 2k stars) and Crossbind (crossbind/crossbind, 148 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cloudflare Workers Multi Lang?
secondsky (a GitHub user) maintains it in secondsky/claude-skills, which has 227 GitHub stars. The repository holds 169 skills in this directory. The repository was last updated on September 28, 2026.
Source: secondsky/claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.