@bacnh85/pi-ponytail

Pi-ponytail — lazy senior dev mode for your Pi agent. Forked from DietrichGebert/ponytail.

Packages

Package details

extensionskill

Install @bacnh85/pi-ponytail from npm and Pi will load the resources declared by the package manifest.

npm repo home report

$ pi install npm:@bacnh85/pi-ponytail

Package: @bacnh85/pi-ponytail
Version: 0.1.14
Published: Sep 12, 2026
Downloads: 1,004/mo · 309/wk
Author: bacnh85
License: MIT
Types: extension, skill
Size: 45.6 KB
Dependencies: 0 dependencies · 0 peers

Pi manifest JSON

{
  "skills": [
    "./skills"
  ],
  "extensions": [
    "./extensions/index.js"
  ]
}

Security note

Pi packages can execute code and influence agent behavior. Review the source before installing third-party packages.

README

@bacnh85/pi-ponytail

Lazy senior dev mode for your Pi coding agent.

He says nothing. He writes one line. It works. Ponytail puts a deadpan senior developer inside your Pi agent. Before writing code it climbs a ladder: does this need to exist? (YAGNI) → already in the codebase? → stdlib? → native platform? → installed dependency? → one line? → minimum that works.

A fork of DietrichGebert/ponytail adapted for the Pi harness.

Install

pi install npm:@bacnh85/pi-ponytail

Commands

Command	What it does
`/ponytail`	Show current and default mode (same as `status`)
`/ponytail lite\|full\|ultra\|off`	Set session intensity
`/ponytail status`	Show current and default mode
`/ponytail default lite\|full\|ultra\|off`	Persist the default across sessions
`/skill:ponytail-review`	Over-engineering review on the current diff
`/skill:ponytail-audit`	Whole-repo over-engineering audit
`/skill:ponytail-debt`	Harvest `ponytail:` shortcut markers into a ledger
`/skill:ponytail-gain`	Show measured-impact scoreboard (benchmark medians)
`/skill:ponytail-help`	Quick reference

Deactivate: stop ponytail or normal mode. Resume with /ponytail <mode> (e.g. /ponytail full).

Intensity levels

Level	What changes
lite	Build what's asked, name the lazier alternative in one line. You pick.
full	The ladder enforced. Stdlib and native first. Shortest diff, shortest explanation. Default.
ultra	YAGNI extremist. Deletion before addition. Ship the one-liner and challenge the rest.
off	Ponytail disabled for this session.

Default mode

Resolution order (first wins):

Env var — PONYTAIL_DEFAULT_MODE=lite|full|ultra|off
Config file — $XDG_CONFIG_HOME/ponytail/config.json or ~/.config/ponytail/config.json
```
{ "defaultMode": "full" }
```
Built-in — full

Subagents

Subagents spawned through the subagent tool (pi-subagent) don't load extensions, so the ruleset wouldn't reach them. When ponytail is active, a tool_call hook prepends a compact ponytail block to the tool call's instructions, which pi-subagent applies to every child (single, parallel, chain, background). All roles get it — scout, worker, planner, reviewer — but plans, reviews, and reports explicitly requested by the task are delivered in full; the block governs what the subagent builds, not requested output.

Set PONYTAIL_SUBAGENT_SCOPE=off to disable subagent injection. Children that load extensions (tool-inheriting agents) self-inject via before_agent_start; the marker prevents a second copy.

Changelog

See CHANGELOG.md for release history.

License

MIT. Same as upstream.