Cohere Translator

Neural machine translation supporting 23 languages using Cohere's Command A Translate model, optimized for file-based input to minimize token costs.

大村愛弥@lykeion-dev

Install

openclaw skills install @lykeion-dev/cohere-translator

Cohere Translator Skill

State-of-the-art neural machine translation using Cohere's Command A Translate model (cohere/command-a-translate-08-2025, 111B parameters, 23 languages).

🔑 Requires a Cohere API key. The model is free for trial keys as of 2026-05-17 (1,000 calls/month, 20 req/min). Get a key at: https://dashboard.cohere.com/api-keys

⚠️ CRITICAL: Always Use File Mode to Save Tokens

When translating file content, use --file/-f mode. This bypasses the agent entirely — the script reads the file directly and translates it. Your agent never loads the file content into its context window.

bash

# ❌ WASTES TOKENS: Agent reads file → passes text as CLI argument
python3 translate.py "$(cat document.txt)" --to ja

# ✅ ZERO AGENT TOKENS: Script reads file directly, agent only issues the command
python3 translate.py -f document.txt --to ja -o output.txt

This is not optional advice — it is the correct way to use this skill. Every byte of text you pass through the agent as a CLI argument doubles your token cost for no benefit. File mode eliminates this entirely.

This applies equally when using the skill from an agent (OpenClaw, Claude Code, etc.) or directly from the command line.

Quick Start

bash

# 1. Set your Cohere API key (get one at https://dashboard.cohere.com/api-keys)
export COHERE_API_KEY="your-key-here"

# 2. Translate a file (RECOMMENDED — zero agent tokens)
python3 skills/cohere-translator/scripts/translate.py -f input.txt --to ja -o output.txt

# 3. Quick one-liner (text on command line — small texts only)
python3 skills/cohere-translator/scripts/translate.py "Hello" --to ja
# → こんにちは

Usage Modes

File Mode (RECOMMENDED)

bash

# File → file
python3 translate.py -f document.txt --to ja -o translated.txt

# File → stdout
python3 translate.py -f document.txt --to en

# Stdin → stdout
cat document.txt | python3 translate.py -f - --to ja

# Stdin → file
cat document.txt | python3 translate.py -f - --to ja -o output.txt

# Large files auto-chunked (6,000+ chars automatically split)
python3 translate.py -f large_document.txt --to ja -o output.txt
# Output: 📄 12000 chars → 16 chunks ... ✓ 16/16

Text Mode (small texts only)

bash

python3 translate.py "Hello world" --to ja    # EN→JA
python3 translate.py "こんにちは" --to en     # JA→EN
python3 translate.py "Bonjour" --to es        # FR→ES

Supported Language Codes

text

en: English     ja: Japanese     zh: Chinese     ko: Korean
fr: French      de: German       es: Spanish     it: Italian
pt: Portuguese  ar: Arabic       ru: Russian     pl: Polish
tr: Turkish     vi: Vietnamese   nl: Dutch       cs: Czech
id: Indonesian  uk: Ukrainian    ro: Romanian    el: Greek
hi: Hindi       he: Hebrew       fa: Persian

Options

text

-f, --file PATH       Input file (or '-' for stdin). PREFERRED MODE.
-o, --output PATH     Output file (default: stdout)
-t, --to CODE         Target language (default: en)
--temperature FLOAT   Temperature 0.1-1.0 (default: 0.3)
--max-tokens INT      Max output tokens per chunk (default: 4000)
--system-prompt STR   System message for constraints
--api-key KEY         Cohere API key (or set COHERE_API_KEY env var)
--json                Output full JSON with token counts
-q, --quiet           Suppress progress messages
--list-languages      List supported language codes

System Prompt Examples

bash

# Operational constraints work well
python3 translate.py -f doc.txt --to ja \
  --system-prompt "Output ONLY the translation. Keep numbers and URLs unchanged."

Note: System prompts work for operational constraints but have limited effect on translation tone/style. The model's DPO training makes translation behavior largely hardwired.

API Key

This skill requires a Cohere API key. Get a free trial key at: https://dashboard.cohere.com/api-keys

Trial keys provide: 1,000 calls/month, 20 req/min, completely free.

bash

export COHERE_API_KEY="your-key-here"

How the Agent Should Use This Skill

text

[TASK] Translate /workspace/document.txt to Japanese.

# Correct:
python3 skills/cohere-translator/scripts/translate.py -f /workspace/document.txt --to ja -o /workspace/document_ja.txt

# The agent never reads document.txt. ZERO context tokens wasted on file content.
# After completion, the agent may read document_ja.txt to verify the result.

Known Limitations

Japanese slang (2ch-style, ギャル語) may cause API errors
System messages cannot change formality reliably
8K input token limit — auto-chunked for files (see translate_file())
Idioms translate literally rather than finding cultural equivalents
Business keigo→European loses some formality density

Quality Matrix

Direction	Casual	Business	Technical	Idioms
JA↔KO	★★★★★	★★★★★	★★★★★	★★★
JA↔ZH	★★★★★	★★★★	★★★★★	★★★
EN→any	★★★★★	★★★★★	★★★★★	★★★★
Any→EN	★★★★★	★★★★★	★★★★★	★★★★
ZH↔KO	★★★★★	—	★★★★★	—
FR↔DE	★★★★★	★★★★★	★★★★★	—

Full research: skills/cohere-translator/RESEARCH.md