OpenEnv is a framework for creating, deploying, and using isolated execution environments through simple APIs modeled on Gymnasium. It is intended for researchers and developers training agents with reinforcement learning, as well as creators who need secure environments that can be deployed and accessed through familiar protocols. The catalogue add-ons provide agent integrations and workflows for using OpenEnv.
Borrowing it
Nothing to install: this file belongs to huggingface/OpenEnv. 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/huggingface/OpenEnv/main/.claude/skills/rfc-check/SKILL.mdgit clone --depth 1 https://github.com/huggingface/OpenEnvWrote 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/skills/huggingface/openenv/rfc-check)<a href="https://agentmods.dev/skills/huggingface/openenv/rfc-check"><img src="https://agentmods.dev/badge/skills/huggingface/openenv/rfc-check/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/skills/huggingface/openenv/rfc-check"><img src="https://agentmods.dev/badge/skills/huggingface/openenv/rfc-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00032 | $0.00514 |
| Opus 5.5 | $0.00013 | $0.00206 |
| Sonnet 5.5 | $0.00006 | $0.00103 |
| Haiku 4.5 | $0.00003 | $0.00051 |
Grade A, and why
rfc-check 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.
What it actually says
RFC Check
Determine if proposed changes require an RFC (Request for Comments).
Instructions
-
Identify changed files using
git diff --name-onlyor provided context -
Apply RFC criteria:
RFC Required:
- New APIs in
src/openenv/core/ - Breaking changes to existing APIs
- New abstractions or design patterns
- Changes affecting the two-interface model (WebSocket/MCP separation)
- Major architectural decisions
RFC Not Required:
- Bug fixes
- Documentation updates
- Minor refactoring (no API changes)
- New example environments (unless introducing new patterns)
- Dependency updates
- Test additions
- New APIs in
-
Check against existing RFCs in
rfcs/for conflicts or dependencies
Analysis Steps
- List all files being changed
- Identify any files in
src/openenv/core/ - Check for public API signature changes
- Look for new abstractions or patterns
- Review existing RFCs for related decisions
Output Format
## RFC Analysis
### Files Changed
- [list of files]
### Core Files Touched
- [any files in src/openenv/core/, or "None"]
### API Changes
- [any signature changes to public APIs, or "None"]
### New Patterns/Abstractions
- [any new patterns introduced, or "None"]
### Verdict: NOT REQUIRED / RECOMMENDED / REQUIRED
### Reasoning
[Explanation of decision based on criteria above]
### If RFC Needed
- Suggested title: "RFC NNN: [title]"
- Related RFCs: [list any related existing RFCs]
- Key decisions to document: [list]
RFC Template Reference
If an RFC is needed, use the template in rfcs/README.md:
# RFC NNN: Title
**Status**: Draft
**Created**: YYYY-MM-DD
**Authors**: @username
## Summary
[1-2 paragraph overview]
## Motivation
[Problem Statement + Goals]
## Design
[Architecture Overview, Core Abstractions, Key Design Decisions]
## Examples
[Code samples demonstrating usage]
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 First seen · 93 lines · 32 tokens per session scan A 33e90598433b
rfc-check is a skill published in the GitHub repository huggingface/OpenEnv (2,739 stars, last pushed 8d ago), licensed BSD-3-Clause. It adds 32 tokens to every session and 514 once invoked, 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 2026-08-31.
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