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Run Codex CLI, Claude Code, OpenCode, or Pi Coding Agent via background process for programmatic control.
Passed 15 of 19 test cases with the skill, and 4 of 19 without it.
and 16 more in the full report
12 fixed5 passed either way5 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to run the Pi coding agent non-interactively to summarize the `src/` directory in `~/Projects/web`. What CLI flag makes Pi run in print/non-interactive mode?
| Checked | Without skill | With skill |
|---|---|---|
| The command uses the `-p` flag for non-interactive mode. | Passed | Passed |
| The execution sets pty to true. | Missed | Passed |
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 4 / 19 without
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