Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add secondsky/claude-skills --skill cloudflare-workers-multi-langgit clone --depth 1 https://github.com/secondsky/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-workers-multi-lang)<a href="https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-workers-multi-lang"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/cloudflare-workers-multi-lang/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/secondsky/claude-skills/cloudflare-workers-multi-lang"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/cloudflare-workers-multi-lang.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00045 | $0.01322 |
| Opus 5.5 | $0.00018 | $0.00529 |
| Sonnet 5.5 | $0.00009 | $0.00264 |
| Haiku 4.5 | $0.00005 | $0.00132 |
Grade A, and why
cloudflare-workers-multi-lang scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
async fn fetch(req: Request, env: Env, _ctx: Context) -> Result<Response> { How it starts
The opening of the file, as written. The whole thing — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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/TypeScript
Top 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
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 187 lines · 45 tokens per session scan A d4540ce033cd
cloudflare-workers-multi-lang is a skill published in the GitHub repository secondsky/claude-skills (235 stars, last pushed 3d ago), licensed MIT. It adds 45 tokens to every session and 1,322 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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