convert-code

A guide for changing code from one programming language or framework into another while keeping its behavior. It also maps dependencies, data structures, asynchronous work, errors, and tests to suitable patterns in the target ecosystem.

In plain words
What is it for?
Migrating modules or projects between languages and frameworks, including replacing libraries, converting concurrency patterns, and carrying over tests.
Why use it?
Directly translating syntax can create unnatural or incorrect code. This helps preserve the original logic while adapting it to how the new language is normally written.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/viknesh20-20/claude-code-tool-kit/convert-code
Any agent
npx skills add viknesh20-20/claude-code-tool-kit --skill convert-code
Clone the repo
git clone --depth 1 https://github.com/viknesh20-20/claude-code-tool-kit

Made for: Claude Code, Codex.

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 736 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00030 $0.00736
Opus 5 $0.00015 $0.00368
Sonnet 5 $0.00006 $0.00147
Haiku 4.5 $0.00003 $0.00074

Measured 2d ago against content hash b7e7a6bea7aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

convert-code scanned grade A with 0 findings 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 2d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/convert-code/SKILL.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Conversion

Instructions

Step 1: Analyze Source Code

  1. Read the source file completely
  2. Identify:
    • All functions, classes, and types
    • External dependencies and their equivalents in the target language
    • Error handling patterns
    • Async/concurrent patterns
    • Data structures and their representations
    • Tests (if present)

Step 2: Map Language Idioms

Don't transliterate — convert to idiomatic target code:

Source Pattern Target Equivalent
Python list comprehension Java streams / Go slices / Rust iterators
JS Promise.all Python asyncio.gather / Go goroutines+WaitGroup / Rust tokio::join
Python dict Go map / Rust HashMap / Java Map
JS destructuring Go multiple returns / Python tuple unpacking
Python decorator Java annotation / Go middleware / Rust macro
C# LINQ Python generators / JS array methods / Rust iterators
Ruby blocks Python context managers / Go defer / Rust closures

Step 3: Handle Dependencies

For each import/dependency in the source:

  1. Find the equivalent package/library in the target ecosystem
  2. If no direct equivalent exists, note it and implement the functionality
  3. Map API calls to the target library's conventions

Step 4: Convert Error Handling

Different languages handle errors differently:

Language Pattern
Python try/except, raise
JavaScript/TypeScript try/catch, throw, Promise rejection
Go Multiple return values (value, error)
Rust Result<T, E>, Option, ? operator
Java/C# try/catch, checked/unchecked exceptions
Ruby begin/rescue/ensure
Elixir {:ok, value} / {:error, reason} tuples

Convert error handling to the idiomatic pattern of the target language.

Step 5: Convert Types

Map type systems:

  • Dynamic → Static: Infer and add explicit types
  • Static → Dynamic: Simplify but add runtime checks where safety-critical
  • Generics: Map to target language's generic system
  • Null safety: Map Optional/Maybe/Option patterns appropriately

Read the full file on GitHub · 86 lines

Changes

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.

  1. 2d ago First seen · 86 lines · 30 tokens per session scan A b7e7a6bea7aa

Subscribe to this mod's changes

convert-code is a skill published in the GitHub repository viknesh20-20/claude-code-tool-kit (7 stars, last pushed 4mo ago), licensed MIT. It adds 30 tokens to every session and 736 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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