Backend Languages Pack
Language-specific defense audits and rewrites for Go, Python, and TypeScript backends.
$5
Works with the AI tools you already use
Claude Code
Cursor
Codex CLI
GitHub Copilot
Gemini CLI+20 moreClaude CodeCursorCodex CLIGitHub CopilotGemini CLI
OpenClaw
Manus
Grok+17 agentsBackend Languages Pack
Example session with this skill installed
Review this Go handler for payment processing:
func Pay(w http.ResponseWriter, r *http.Request) {
var m map[string]float64
json.NewDecoder(r.Body).Decode(&m)
amount := m["amount"]
paySDK.Charge(amount)
}
- Read your context and instructions
- Compiled the backend languages
Audit
- handler.go:2: Body decoded without MaxBytesReader; DoS risk.
- handler.go:4: float64 used for money; rounding drift risk.
- handler.go:5: Error from Charge ignored.
Rewrite
[Full Go code provided with int64 cents, ctx propagation, and error handling]
Connects securely to your tools. The creator never sees your data.
What you get
About this skill
The problem
Shipping code with silent concurrency bugs, data races, or precision errors in financial math is easy. Standard linters catch syntax, but they often miss language-specific defense patterns like proper error wrapping in Go, event-loop blocking in Python, or floating-promise leaks in Node.js.
What it does
- Audits Go, Python, and TypeScript/Node.js source code for language-specific anti-patterns.
- Maps every identified bug to a specific file and line number to eliminate ambiguity.
- Provides full, copy-pasteable rewrites that implement defensive coding standards.
- Generates specific shell commands and test runners to verify the fix locally.
- Identifies architectural gaps like missing idempotency or incomplete error hierarchies.
Frameworks & tools
Go (1.24+), Python (3.11+), FastAPI, Pydantic, TypeScript (5+), Node.js (20+), Zod, Vitest, Pytest, and Singleflight.
Why this beats prompting it yourself
General LLMs often suggest generic fixes that ignore critical language nuances, like using floats for money or neglecting context propagation in goroutines. This skill uses a strict defense matrix that enforces specific patterns—like minor-unit integer math and exhaustive error wrapping—ensuring production-grade safety without manual oversight.
Use cases
- Reviewing concurrent Go handlers for race conditions and resource leaks.
- Hardening FastAPI routes with Pydantic validation and async-safe database calls.
- Converting Node.js Express handlers to strict TypeScript with ESM and Zod validation.
- Refactoring financial logic to use integer minor units or Decimal types instead of floats.
Known limitations
Operates strictly on source text and repository layout. It cannot compile code, execute tests, or fetch external dependencies.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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Recently published to Agensi
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Security scanned
Verified clean 22 days ago
- Passed all security checks, Safe to install