smolagents: Instructions file for Codex

AGENTS.md

smolagents AGENTS.md is an instructions file for Codex, OpenCode from huggingface/smolagents. It costs 32 tokens per session, scanned A, original, Apache-2.0.

Contributor instructions for smolagents, a Python library for agents that write code as part of their reasoning. They emphasize object-oriented design, idiomatic Python, and unit tests for new code.

In plain words
What is it for?
Developing or reviewing smolagents code according to its design, Python, and testing guidelines.
Why use it?
They set project expectations so contributions fit the existing code style and include tests.

Instructions file for CodexOpenCode ✓ vendor

Written for Codex and OpenCode: the file is AGENTS.md.

This is huggingface/smolagents's own configuration. It tells Codex and OpenCode how to work on smolagents itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything smolagents configures →

Reuse

Borrowing it

Nothing to install: this file belongs to huggingface/smolagents. 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/huggingface/smolagents/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/huggingface/smolagents

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.

agentmods badge for smolagents AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/huggingface/smolagents/agents-md"><img src="https://agentmods.dev/badge/instructions/huggingface/smolagents/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.

agentmods 80×15 button for smolagents AGENTS.md

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<a href="https://agentmods.dev/instructions/huggingface/smolagents/agents-md"><img src="https://agentmods.dev/badge/instructions/huggingface/smolagents/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 This file is loaded in full into every session.
When invoked 32 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00032
Opus 5.5 $0.00013 $0.00013
Sonnet 5.5 $0.00006 $0.00006
Haiku 4.5 $0.00003 $0.00003

Measured 2mo ago against content hash 69e08bedb27a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

smolagents 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 2mo 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 · 5 lines

What it actually says

Contributor Guidelines

  • Follow OOP principles
  • Be Pythonic: follow Python best practices and idiomatic patterns
  • Write unit tests for new functionality
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.

  1. 2mo ago First seen · 5 lines · 32 tokens per session scan A 69e08bedb27a

Subscribe to this mod's changes

smolagents AGENTS.md is an instructions file published in the GitHub repository huggingface/smolagents (30,223 stars, last pushed 3d ago), licensed Apache-2.0. It adds 32 tokens to every session, about $0.0001 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.

Related

smolagents AGENTS.md compared with instructions from other repositories

smolagents AGENTS.md next to 6 instructions from other repositories
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smolagents AGENTS.mdhuggingface/smolagentsInstructions file30k3d agoApache-2.0A32Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA5,516GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode