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Run Codex CLI, Claude Code, OpenCode, or Pi Coding Agent via background process for programmatic control.
Passed 13 of 18 test cases with the skill, and 6 of 18 without it.
and 8 more in the full report
10 fixed6 passed either way5 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
The instructions your model reads when the skill loads.
Use bash (with optional background mode) for all coding agent work. Simple and effective.
Coding agents (Codex, Claude Code, Pi) are interactive terminal applications that need a pseudo-terminal (PTY) to work correctly. Without PTY, you'll get broken output, missing colors, or the agent may hang.
Always use pty:true when running coding agents:
# ✅ Correct - with PTY
bash pty:true command:"codex exec 'Your prompt'"
# ❌ Wrong - no PTY, agent may break
bash command:"codex exec 'Your prompt'"
| Parameter | Type | Description |
|---|---|---|
command | string | The shell command to run |
pty | boolean | Use for coding agents! Allocates a pseudo-terminal for interactive CLIs |
workdir | string | Working directory (agent sees only this folder's context) |
background | boolean | Run in background, returns sessionId for monitoring |
timeout | number | Timeout in seconds (kills process on expiry) |
elevated | boolean | Run on host instead of sandbox (if allowed) |
| Action | Description |
|---|---|
list | List all running/recent sessions |
poll | Check if session is still running |
log | Get session output (with optional offset/limit) |
write | Send raw data to stdin |
submit | Send data + newline (like typing and pressing Enter) |
send-keys | Send key tokens or hex bytes |
paste | Paste text (with optional bracketed mode) |
test cases passed, vs 6 / 18 without
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