What is pi-subagents AGENTS.md?

Repository instructions for a Pi package extension, which adds subagent features to the Pi coding environment. They define where agent, launch, runtime, session, and tool code belongs.

Planning changes to subagents, child-process launching, session files, runtime state, tools, tests, and extension wiring.

They help agents understand the project’s ownership boundaries and avoid putting unrelated code into catch-all folders. They also identify the expected test setup.

How edxeth/pi-subagents configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to edxeth/pi-subagents. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/edxeth/pi-subagents/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/edxeth/pi-subagents

Made for: Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/edxeth/pi-subagents/agents-md/github.svg)](https://agentmods.dev/instructions/edxeth/pi-subagents/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/edxeth/pi-subagents/agents-md"><img src="https://agentmods.dev/badge/instructions/edxeth/pi-subagents/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/edxeth/pi-subagents/agents-md"><img src="https://agentmods.dev/badge/instructions/edxeth/pi-subagents/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,487 This file is loaded in full into every session.

When invoked 1,487 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01487	$0.01487
Opus 5.5	$0.00595	$0.00595
Sonnet 5.5	$0.00297	$0.00297
Haiku 4.5	$0.00149	$0.00149

Measured 1mo ago against content hash 090cc2b6601d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pi-subagents 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 1mo 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.

AGENTS.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Read README.md before doing anything. It documents the model, frontmatter, placement policies, and env vars this package exposes.

Package facts

This is a Pi package extension. Extension entrypoint is src/index.ts.
Tests run on plain node --test (see package.json scripts). npm test and bun test both work.
One-off checks (tsc, biome, knip) run via bunx so no extra deps are declared.
@earendil-works/[email protected] imports @earendil-works/pi-server from its root barrel without declaring it as a dependency; the explicit pi-server devDependency pins around that. Drop the pin once upstream declares it.

Project structure contract

Keep the repository organized by ownership. Do not recreate a catch-all src/subagents/ or generic test/parts/ directory.

Source layout:

src/subagents.ts is extension wiring only: event hooks, tool registration, and thin glue.
src/agents/ owns agent definitions, catalog messaging, and titles.
src/launch/ owns child launch preparation, launch policy, child command construction, resume args, prompt artifacts, runtime path resolution, and session seeding.
src/runtime/ owns running state, wait/join, shutdown, background/interactive watchers, result routing, and widgets.
src/session/ owns JSONL session helpers and trimmed fork-session logic.
src/tools/ owns Pi tool/command implementations and tool policy.
src/mux/ owns multiplexer internals; src/mux.ts is the public barrel.
src/artifact-storage.ts owns artifact storage roots/paths. src/launch/prompt-artifacts.ts owns writing launch prompt/task artifact files. Do not blur these names.
src/types.ts is shared runtime type surface only; do not turn it into a junk drawer.

Test layout:

Use test/, not tests/; node --test scripts already target test/.
Mirror source ownership in tests. Each domain suite must be imported by test/test.ts, or npm test will not run it.
test/support/ is split by ownership; do not recreate a fat test/support.ts. Check the current files with ls rather than assuming.
Never name split files part-*, chunk-*, or similar. File names must describe the behavior/domain they test.

Read the full file on GitHub · 123 lines

Changes

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.

1mo ago Changed · +41 tokens per session 090cc2b6601d
1mo ago Changed · +3 lines · +142 tokens per session 019e0da4ccbf
2mo ago First seen · 120 lines · 1,304 tokens per session scan A a53c68c4517b

Subscribe to this mod's changes

pi-subagents AGENTS.md is an instructions file published in the GitHub repository edxeth/pi-subagents (136 stars, last pushed 1mo ago), licensed MIT. It adds 1,487 tokens to every session, about $0.0059 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.

Building agents

pi-subagents AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
pi-subagents AGENTS.mdedxeth/pi-subagents	Instructions file	136	1mo ago	MIT	A	1,487	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

pi-subagents: Instructions file for Codex