Borrowing it
Nothing to install: this file belongs to nominal-io/instro. 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/nominal-io/instro/main/AGENTS.mdgit clone --depth 1 https://github.com/nominal-io/instroWrote 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/nominal-io/instro/agents-md)<a href="https://agentmods.dev/instructions/nominal-io/instro/agents-md"><img src="https://agentmods.dev/badge/instructions/nominal-io/instro/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/nominal-io/instro/agents-md"><img src="https://agentmods.dev/badge/instructions/nominal-io/instro/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 | $0.07952 | $0.07952 |
| Opus 5.5 | $0.03181 | $0.03181 |
| Sonnet 5.5 | $0.01590 | $0.01590 |
| Haiku 4.5 | $0.00795 | $0.00795 |
Grade A, and why
instro 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 21d 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 — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Context for AI coding tools (Claude Code, Cursor, OpenAI Codex CLI, GitHub Copilot Workspace, Aider, etc.) working in this repo. Human contributors should read CONTRIBUTING.md instead. This file is dense on purpose.
Quick reference
uv sync # default dev/test environment, including native EtherNet/IP
uv sync --extra all # additionally select all extras defined in pyproject.toml
uv sync --extra <name> # install one optional package (daq, labjack, nidaq, mccdaq, i2c, aardvark)
just check # all lints: python (ruff format, mypy, ruff lint) + Rust (rustfmt, clippy, lockfiles)
just test # all tests: python + Rust; no hardware required
just check-python / check-rust # single-language lints (check-rust uses nightly fmt + locked clippy)
just test-python / test-rust # single-language tests
just build-docs / serve-docs # docs site (docs/, Sphinx): strict build / live preview; needs the `docs` group, Python >=3.12
uv build --wheel --package <name> # build a wheel for a workspace package
just check and just test cover local linting and tests. Build/test CI also checks uv lock --check and runs across supported OS/Python combinations. Separate workflows check the docs build (just build-docs, warnings as errors) and PR titles. A local pass does not guarantee a full CI pass. The scheduled latest-dependencies workflow re-resolves dependencies and runs Python tests; it is not part of PR CI.
The default dev group in pyproject.toml includes the local maturin-built instro-ethernetip package, so fresh setup for Python checks/tests also needs Rust and a C/C++ compiler/linker. just check and just test additionally need CMake and LLVM/libclang for the OPC UA workspace crates. The justfile uses a separate nightly rustfmt for check-rust and fix-rust; install it with rustup toolchain install nightly --profile minimal --component rustfmt. test-rust runs Rust tests with cargo-nextest (plus cargo test --doc for doctests, which nextest skips); install it with cargo install cargo-nextest --locked or a prebuilt binary. See Prerequisites for per-OS setup.
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.
- 21d ago Changed · +35 tokens per session 33d0631b2bbb
- 23d ago Changed · -1 lines · +74 tokens per session 413eae6de617
- 27d ago Changed · +56 tokens per session 0099101d9526
- 29d ago Changed · -7 lines · -459 tokens per session d96f3aec7457
- 1mo ago Changed · +1 lines · +189 tokens per session f499a0260cea
- 1mo ago Changed · +22 lines · +576 tokens per session 9aabcb318e1a
- 1mo ago Changed · +2 tokens per session dccf1a7f6570
- 1mo ago Changed · +1 lines · +117 tokens per session b9c7a21604b5
- 1mo ago Changed · +62 tokens per session b32eb0c86001
- 1mo ago First seen · 186 lines · 7,300 tokens per session scan A 438f5eb97525
instro AGENTS.md is an instructions file published in the GitHub repository nominal-io/instro (726 stars, last pushed yesterday), licensed Apache-2.0. It adds 7,952 tokens to every session, about $0.0318 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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.