Oh My Pi is a coding agent with an integrated development environment, command-line interface, tools, language-server operations, and debugger operations. It is used by developers who want an AI coding assistant that can read and edit projects, work with models from multiple providers, and interact with development tools. The catalogue add-ons extend its agent workflows with skills, commands, agents, plugins, MCP, and instructions.
Borrowing it
Nothing to install: this file belongs to can1357/oh-my-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/can1357/oh-my-pi/main/AGENTS.mdgit clone --depth 1 https://github.com/can1357/oh-my-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/can1357/oh-my-pi/agents-md)<a href="https://agentmods.dev/instructions/can1357/oh-my-pi/agents-md"><img src="https://agentmods.dev/badge/instructions/can1357/oh-my-pi/agents-md.svg" alt="Measured on agentmods" 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 | $0.06302 | $0.06302 |
| Opus 5 | $0.03151 | $0.03151 |
| Sonnet 5 | $0.01260 | $0.01260 |
| Haiku 4.5 | $0.00630 | $0.00630 |
Grade A, and why
oh-my-pi AGENTS.md scanned grade A with 1 finding 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 6d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
Use Bun APIs where they provide a cleaner alternative; fall back to `node:*` only for what Bun doesn't cover. **Never spawn shell commands for operations with proper APIs** (e.g., don't `Bun.spawnSync(["mkdir", "-p", dir How it starts
The opening of the file, as written. The whole thing — 337 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Development Rules
Default Context
This repo contains multiple packages, but packages/coding-agent/ is the primary focus. Unless otherwise specified, assume work refers to this package.
Terminology: When the user says "agent" or asks "why is agent doing X", they mean the coding-agent package implementation, not you (the assistant). The coding-agent is a CLI tool — questions about its behavior refer to code in packages/coding-agent/, not your current session.
Package Structure
| Package | Description |
|---|---|
packages/ai |
Multi-provider LLM client with streaming support |
packages/catalog |
Model catalog: bundled models.json, provider descriptors, model identity/classification |
packages/agent |
Agent runtime with tool calling and state management |
packages/coding-agent |
Main CLI application (primary focus) |
packages/tui |
Terminal UI library with differential rendering |
packages/natives |
Bindings for native text/image/grep operations |
packages/stats |
Local observability dashboard (omp stats) |
packages/omptype |
ArkType-compatible schema validation with a lazy JIT runtime |
packages/utils |
Shared utilities (logger, streams, temp files) |
crates/pi-natives |
Rust crate for performance-critical text/grep ops |
Catalog import convention: code in this repo imports catalog values (bundled models, model-thinking helpers, identity, descriptors, model manager/cache) from @oh-my-pi/pi-catalog/<module> — never via @oh-my-pi/pi-ai. The pi-ai barrel re-exports only the model/effort types its own signatures use (Model, Api, ThinkingConfig, Effort, …); type-only imports of those from @oh-my-pi/pi-ai are fine.
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.
- 6d ago Changed · -2 tokens per session 9ddc472e0ead
- 8d ago First seen · 337 lines · 6,304 tokens per session scan A a6d7bd1d62a7
oh-my-pi AGENTS.md is an instructions file published in the GitHub repository can1357/oh-my-pi (30,061 stars, last pushed today), licensed MIT. It adds 6,302 tokens to every session, about $0.0315 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
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.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.