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Agent skill

Sandbox Fallback Execution 048d5a

by HKUDS in HKUDS/OpenSpace

Fallback method to execute Python code when executecodesandbox fails with e2b errors

MITAuto-check passed

Install Sandbox Fallback Execution 048d5a

skills CLI
$ npx skills add HKUDS/OpenSpace --skill sandbox-fallback-execution-048d5a -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HKUDS/OpenSpace sandbox-fallback-execution-048d5a --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/benchmarks/gdpval/skills/sandbox-fallback-execution-048d5a .claude/skills/sandbox-fallback-execution-048d5a && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
sandbox-fallback-execution-048d5a
GitHub stars
7.8k
Token cost
~619 tokens
SKILL.md length
215 words
Files
2
Skills in repo
199
Repo updated
First seen
Licence
MIT

At a glance

Fallback method to execute Python code when executecodesandbox fails with e2b errors

  • Works in 3 steps: Write Python Script to File → Execute via Shell → Verify Output
  • SKILL.md covers When to Use, Steps, Complete Example and Tips, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Sandbox Fallback Execution 048d5a is an agent skill from HKUDS/OpenSpace. Fallback method to execute Python code when executecodesandbox fails with e2b errors

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It works with Python. The repository describes itself as: "OpenSpace: The Skill Management Layer for AI Agents" -- https://open-space.cloud/. The licence is MIT.

Example prompts

  • “/sandbox-fallback-execution-048d5a”

Requirements

  • Python 3

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Write Python Script to File
  2. Execute via Shell
  3. Verify Output

What it can do on your machine

Read from SKILL.md and the folder at commit 3827781. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are yaml).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Sandbox Fallback Execution 048d5a loads about 619 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 215 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~619

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HKUDS/OpenSpace at commit 3827781, republished under its MIT licence (© HKUDS). 215 words, ~619 tokens.

Download SKILL.mdSave it as .claude/skills/sandbox-fallback-execution-048d5a/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
sandbox-fallback-execution-048d5a
description
Fallback method to execute Python code when execute_code_sandbox fails with e2b errors

Sandbox Fallback Execution

When execute_code_sandbox repeatedly fails with e2b sandbox errors, use this fallback pattern to execute Python code directly on the host system.

When to Use

Use this skill when:

  • execute_code_sandbox fails with e2b-related errors
  • Multiple retry attempts (3+) have not resolved the issue
  • The code does not require sandbox isolation

Steps

Step 1: Write Python Script to File

Use write_file to save your Python code as a .py file:

Tool: write_file
path: /workspace/script_name.py
content: |
  # Your Python code here
  import pandas as pd
  # ... rest of code
Step 2: Execute via Shell

Use run_shell with explicit python3 path:

Tool: run_shell
command: python3 /workspace/script_name.py
timeout: 120
Step 3: Verify Output

Check the stdout/stderr from run_shell for:

  • Successful execution messages
  • Expected output or file creation confirmations
  • Any errors that need debugging

Complete Example

yaml
# Instead of this (failing):
Tool: execute_code_sandbox
code: |
  import pandas as pd
  df = pd.DataFrame({'a': [1,2,3]})
  df.to_excel('output.xlsx')

# Use this fallback:
Tool: write_file
path: /workspace/generate_report.py
content: |
  import pandas as pd
  
  # Create sample data
  df = pd.DataFrame({'a': [1,2,3], 'b': [4,5,6]})
  
  # Save to Excel
  df.to_excel('/workspace/output.xlsx', index=False)
  print('File created successfully')

Tool: run_shell
command: python3 /workspace/generate_report.py
timeout: 120

Tips

  1. Use absolute paths in your Python script when reading/writing files
  2. Add print statements for debugging since you won't get interactive output
  3. Increase timeout if the script performs heavy computation
  4. Check working directory - scripts run from the workspace root by default
  5. Handle errors explicitly with try/except blocks and meaningful error messages

Common e2b Errors That Trigger This Fallback

  • E2B execution error
  • Sandbox timeout
  • Connection refused
  • Sandbox initialization failed
  • Repeated retry failures (3+ attempts)

When NOT to Use This Fallback

  • When sandbox isolation is required for security
  • When the code needs specific sandbox environment variables
  • On first failure only - try execute_code_sandbox retry first

© HKUDS, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in benchmarks/gdpval/skills/sandbox-fallback-execution-048d5a of HKUDS/OpenSpace.

  • SKILL.md
  • .skill_id

Open the folder on GitHubat commit 3827781

Compare with similar skills

Sandbox Fallback Execution 048d5a next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Sandbox Fallback Execution 048d5a compared with similar skills
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Sandbox Fallback Execution 048d5a this skillHKUDS/OpenSpace7.8k—~619Automated safety check: PassMIT
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NotebookLM Research AssistantPleasePrompto/notebooklm-skill7.8k14 repos~2.4kAutomated safety check: NotesMIT
Manim Video Productionbrowser-use/video-use28k6 repos~3kAutomated safety check: PassMIT
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Works with

Questions about Sandbox Fallback Execution 048d5a

What does Sandbox Fallback Execution 048d5a do?

Fallback method to execute Python code when executecodesandbox fails with e2b errors. Sandbox Fallback Execution 048d5a is an agent skill from HKUDS/OpenSpace.

How do I install Sandbox Fallback Execution 048d5a in Claude Code?

Run `npx skills add HKUDS/OpenSpace --skill sandbox-fallback-execution-048d5a -a claude-code`. Or copy the skill folder (benchmarks/gdpval/skills/sandbox-fallback-execution-048d5a in HKUDS/OpenSpace) into .claude/skills/sandbox-fallback-execution-048d5a in your project. Claude Code loads it when a task matches its description.

How do I install Sandbox Fallback Execution 048d5a in Codex?

Run `npx skills add HKUDS/OpenSpace --skill sandbox-fallback-execution-048d5a -a codex`. Or copy the skill folder (benchmarks/gdpval/skills/sandbox-fallback-execution-048d5a in HKUDS/OpenSpace) into .agents/skills/sandbox-fallback-execution-048d5a in your project. Codex loads it when a task matches its description.

Can I use Sandbox Fallback Execution 048d5a in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HKUDS/OpenSpace --skill sandbox-fallback-execution-048d5a -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sandbox-fallback-execution-048d5a, .gemini/skills/sandbox-fallback-execution-048d5a, .github/skills/sandbox-fallback-execution-048d5a and .opencode/skills/sandbox-fallback-execution-048d5a in your project.

What does Sandbox Fallback Execution 048d5a need to run?

SKILL.md names no scripts, command-line tools or credentials: Sandbox Fallback Execution 048d5a is instructions for the agent only. Our summary lists: Python 3.

Does Sandbox Fallback Execution 048d5a access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Sandbox Fallback Execution 048d5a safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Sandbox Fallback Execution 048d5a use?

Sandbox Fallback Execution 048d5a is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Sandbox Fallback Execution 048d5a use?

About 619 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Sandbox Fallback Execution 048d5a?

Skills that share tags, products or a category with Sandbox Fallback Execution 048d5a: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sandbox Fallback Execution 048d5a?

HKUDS (a GitHub organization) maintains it in HKUDS/OpenSpace, which has 7,750 GitHub stars. The repository holds 199 skills in this directory. The repository was last updated on August 12, 2026.

Source: HKUDS/OpenSpace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.