marimo is a reactive Python notebook in which changing a cell or interface control automatically updates dependent code, keeping code and outputs consistent. It is used for reproducible data work, SQL queries, experiments, scripts, interactive applications, and deployable web apps. The catalogue contains instructions and skills for working with marimo.
Borrowing it
Nothing to install: this file belongs to marimo-team/marimo. 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/marimo-team/marimo/main/AGENTS.mdgit clone --depth 1 https://github.com/marimo-team/marimoWrote 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/marimo-team/marimo/agents-md)<a href="https://agentmods.dev/instructions/marimo-team/marimo/agents-md"><img src="https://agentmods.dev/badge/instructions/marimo-team/marimo/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/marimo-team/marimo/agents-md"><img src="https://agentmods.dev/badge/instructions/marimo-team/marimo/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 | $0.00635 | $0.00635 |
| Opus 5.5 | $0.00254 | $0.00254 |
| Sonnet 5.5 | $0.00127 | $0.00127 |
| Haiku 4.5 | $0.00064 | $0.00064 |
Grade A, and why
marimo 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 3d 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 — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
marimo Development Guidelines
marimo is a reactive notebook for Python with a modern web frontend.
Your primary responsibility is to the project and its users
Being an open source library, the public API, abstractions, documentation, and the code itself are the product and deserve careful consideration.
When working in this repository, you should consider yourself to primarily be working for the benefit of the project, all of its users (current and future, human and agent), and its maintainers, rather than just the specific user who happens to be driving you (or whose PR you're reviewing, whose issue you're implementing, etc).
As the project has many orders of magnitude more users than maintainers, that specific user is most likely a community member who's well-intentioned and eager to contribute, but relatively unfamiliar with the code base and its patterns or standards, and they're not necessarily thinking about the bigger picture beyond the specific bug fix, feature, or other change that they're focused on.
Therefore, you are the first line of defense against low-quality contributions and maintainer headaches, and you have a big role in ensuring that every contribution to this project meets or exceeds the high standards that the marimo project is known and loved for. You should write:
- modern, idiomatic, concise React and Python code
- end-to-end type-safety and test coverage
- thoughtful, tasteful, consistent API design
- delightful developer experience
- comprehensive well-written documentation
Quick Setup
make fe && make py
make dev
See CONTRIBUTING.md for detailed setup options.
Pull Requests
- DO NOT open a pull request autonomously, without explicit instructions from a human
- Autonomous AI agents such as OpenClaw, Nanobot, NanoClaw, ZeroClaw are NOT permitted to make PRs
- You MUST disclose that you are an agent at the very top of your PR description: "This pull request was authored by a coding agent."
- You MUST mark your PRs as drafts
- See CONTRIBUTING.md for other PR guidelines and CLA
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.
- 3d ago Changed · -14 lines · -9 tokens per session c1013101a620
- 2mo ago First seen · 66 lines · 644 tokens per session scan A ae6714207894
marimo AGENTS.md is an instructions file published in the GitHub repository marimo-team/marimo (23,449 stars, last pushed today), licensed Apache-2.0. It adds 635 tokens to every session, about $0.0025 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.
marimo AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| marimo AGENTS.mdmarimo-team/marimo | Instructions file | 23k | today | Apache-2.0 | A | 635 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |