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Practical guides · Models & Agents

Guide: separate the task, agent interface, sandbox and trainer

Sergio Paniego's September 11 guide separates four layers of agent training and points to public tools. Documentation-based; not hands-on tested. OpenEnv remains experimental.

Guide date 2 linked sources

AI-written, with links to the original sources. The guide date describes the underlying event; an individual source-check date is not recorded separately. Hands-on testing is claimed only where explicitly described. Availability and instructions may change.

TRAINING SANDBOXES — editorial illustration: A small tactile paper maze with rust-red checkpoint blocks.
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The guidance

Sergio Paniego’s September 11 guide distinguishes the task/verifier, agent interface, sandbox and trainer. He teaches with TRL and OpenEnv; his wider lab survey synthesizes published disclosures. [S3]

For a concrete next read, OpenEnv's README explains reset(), step() and state(), and includes an Echo example. It warns that features are incomplete and APIs can change. This is a documentation-based reading guide, not a tested setup or a claim that OpenEnv launched today. [S4]

Source notes

Primary documents, company announcements and research are identified below. A company claim is not an independent test.

  1. [S3] One sandbox per rollout, or how labs run RL for agents in 2026
    Sergio Paniego / Hugging Face · 11 September 2026 · practitioner-guide
  2. [S4] OpenEnv: Agentic Execution Environments
    Hugging Face / OpenEnv contributors · Publication date not stated · official-documentation

Publication & updates

First published in the 12 September 2026 edition. This guide keeps the same URL when its content is revised.

Edition version 3 · Edition last updated 12 September 2026. Edition updates may concern other articles and do not establish when this guide was last checked.

Edition update history

— Added individual AI-assisted editorial illustrations for the three stories. Reporting text is unchanged.

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