Borrowing it
Nothing to install: this file belongs to TGYD-helige/pi. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/TGYD-helige/pi/master/AGENTS.mdgit clone --depth 1 https://github.com/TGYD-helige/piWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/tgyd-helige/pi/agents-md)<a href="https://agentmods.dev/instructions/tgyd-helige/pi/agents-md"><img src="https://agentmods.dev/badge/instructions/tgyd-helige/pi/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/tgyd-helige/pi/agents-md"><img src="https://agentmods.dev/badge/instructions/tgyd-helige/pi/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.04475 | $0.04475 |
| Opus 5.5 | $0.01790 | $0.01790 |
| Sonnet 5.5 | $0.00895 | $0.00895 |
| Haiku 4.5 | $0.00447 | $0.00447 |
Grade A, and why
pi AGENTS.md 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 405 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pi Extensions Monorepo — Agent Guidelines
Project Overview
This monorepo contains Pi extensions (packages/pi-*), a shared library (packages/shared), and integration tests (tests/). Most packages are Pi extensions — TypeScript modules that hook into the Pi agent runtime.
Required Agent Skills
Two external skill sets are mandatory when developing in this repo. Install them for your harness before starting work; if your harness cannot install skills, follow the rules inlined below.
ponytail — minimal-code discipline
Every code change follows ponytail's ladder — stop at the first rung that holds:
1. Does this need to exist? → no: skip it (YAGNI)
2. Already in this codebase? → reuse it, don't rewrite (check sibling packages and packages/shared first)
3. Stdlib does it? → use it
4. Native platform feature? → use it
5. Installed dependency? → use it — no new deps for one-call problems
6. One line? → one line
7. Only then: the minimum that works
The ladder runs after understanding the problem, never instead of it: read the code the change touches and trace the real flow before picking a rung. Lazy about the solution, never about reading — and never about trust-boundary validation, data-loss handling, security, or accessibility.
Install:
- Claude Code:
/plugin marketplace add DietrichGebert/ponytail, then/plugin install ponytail@ponytail(two separate prompts) - Codex:
codex plugin marketplace add DietrichGebert/ponytail && codex plugin add ponytail@ponytail, then trust its two lifecycle hooks under/hooks
mattpocock/skills — engineering workflow skills
Use this skill set for process work in this repo:
triage— processing new issues/PRs (labels: thetype/*+P0–P3set managed by.github/workflows/labeler.yml)to-spec/to-tickets— before non-trivial implementationstdd— behavior changes in packages with existing coverage (see Unit Test Convention)diagnosing-bugs— no fix without a reproduced root causeresearch,code-review,resolving-merge-conflicts— as named
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.
- 10d ago Changed · +1 lines · +52 tokens per session 43644b24ffe9
- 1mo ago First seen · 404 lines · 4,423 tokens per session scan A a654f322e44b
pi AGENTS.md is an instructions file published in the GitHub repository TGYD-helige/pi (84 stars, last pushed today), licensed Apache-2.0. It adds 4,475 tokens to every session, about $0.0179 per session on Opus 5.5. 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.