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Agent skill

Python Heredoc Fallback

by HKUDS in HKUDS/OpenSpace

Use shell Python heredoc as fallback when code sandbox fails

MITAuto-check passedData & Analytics

Install Python Heredoc Fallback

skills CLI
$ npx skills add HKUDS/OpenSpace --skill python-heredoc-fallback -a claude-code

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

GitHub CLI
$ gh skill install HKUDS/OpenSpace python-heredoc-fallback --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/python-heredoc-fallback .claude/skills/python-heredoc-fallback && 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
python-heredoc-fallback
GitHub stars
7.7k
Token cost
~873 tokens
SKILL.md length
261 words
Files
2
Skills in repo
199
Repo updated
First seen
Licence
MIT

At a glance

Use shell Python heredoc as fallback when code sandbox fails

  • Works in 3 steps: Matplotlib Graph Generation → Python-docx Document Creation → General File Operations
  • Data & Analytics work in your project
  • SKILL.md covers When to Use, Core Pattern, Key Syntax Rules and Common Use Cases, plus 3 more sections
  • Calls python3 and pip

What it does

Python Heredoc Fallback is an agent skill from HKUDS/OpenSpace. Use shell Python heredoc as fallback when code sandbox fails

Its SKILL.md is about 870 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Data & Analytics. 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.

When your agent uses it

  • Data & Analytics work in your project

Example prompts

  • “/python-heredoc-fallback”

Requirements

  • Python 3

Workflow steps

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

  1. Matplotlib Graph Generation
  2. Python-docx Document Creation
  3. General File Operations

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

    Shell commands in SKILL.md call:

    • python3
    • pip

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

  • Network

    No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.

    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

Python Heredoc Fallback loads about 873 tokens when it runs. Until then it costs about 21 tokens; SKILL.md has 261 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~21
When it runs · the whole SKILL.md, loaded when a task matches
~873

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). 261 words, ~873 tokens.

Download SKILL.mdSave it as .claude/skills/python-heredoc-fallback/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
python-heredoc-fallback
description
Use shell Python heredoc as fallback when code sandbox fails

Python Heredoc Fallback for Code Execution

When to Use

Use this pattern when execute_code_sandbox fails with e2b initialization errors, sandbox connection issues, or other execution environment problems. This is especially reliable for file generation tasks.

Core Pattern

Instead of execute_code_sandbox, run Python code directly in the shell using a heredoc:

bash
python3 << 'EOF'
# Your Python code here
import sys
print("Python code executing in shell")
EOF

Key Syntax Rules

  1. Use single-quoted EOF (<< 'EOF') to prevent shell variable expansion within the Python code
  2. No indentation before EOF - the closing delimiter must be at the start of the line
  3. Install packages first if needed, before the Python heredoc block

Common Use Cases

1. Matplotlib Graph Generation
bash
python3 << 'EOF'
import matplotlib.pyplot as plt
import pandas as pd

# Load data
data = pd.read_excel('input.xlsx')

# Create visualization
plt.figure(figsize=(10, 6))
plt.plot(data['x'], data['y'])
plt.xlabel('X Label')
plt.ylabel('Y Label')
plt.title('Graph Title')
plt.savefig('output_graph.png', dpi=300, bbox_inches='tight')
plt.close()

print("Graph saved successfully")
EOF
2. Python-docx Document Creation
bash
pip install python-docx -q

python3 << 'EOF'
from docx import Document
from docx.shared import Inches, Pt
from docx.enum.text import WD_ALIGN_PARAGRAPH

doc = Document()

# Add title
title = doc.add_heading('Document Title', 0)
title.alignment = WD_ALIGN_PARAGRAPH.CENTER

# Add sections
doc.add_heading('Section 1', level=1)
doc.add_paragraph('Content for section 1.')

# Add table
table = doc.add_table(rows=3, cols=3)
table.style = 'Table Grid'

# Save document
doc.save('output.docx')
print("Document created successfully")
EOF
3. General File Operations
bash
python3 << 'EOF'
import json
import os

# Read input file
with open('input.json', 'r') as f:
    data = json.load(f)

# Process data
result = {'processed': True, 'items': len(data)}

# Write output
with open('output.json', 'w') as f:
    json.dump(result, f, indent=2)

print(f"Processed {result['items']} items")
EOF

Best Practices

  1. Install dependencies first: Run pip install package-name -q before the Python block if packages aren't guaranteed to be available
  2. Verify file paths: Files are read from and written to the current working directory
  3. Add print statements: Include progress/output messages to verify execution succeeded
  4. Close resources: Explicitly close matplotlib figures and file handles
  5. Handle errors gracefully: Add try/except blocks for production code

Troubleshooting

IssueSolution
Module not foundAdd pip install <module> -q before Python block
File not foundVerify file exists in current directory with ls
Permission deniedCheck file permissions and directory write access
Syntax errorsEnsure proper Python indentation within heredoc

Advantages Over execute_code_sandbox

  • No initialization overhead - runs immediately in existing shell
  • Persistent environment - maintains state across multiple commands
  • Direct file system access - no sandbox isolation issues
  • Full system Python - access to all installed packages
  • Reliable for large files - no sandbox size restrictions

© 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/python-heredoc-fallback of HKUDS/OpenSpace.

  • SKILL.md
  • .skill_id

Open the folder on GitHubat commit 3827781

Compare with similar skills

Python Heredoc Fallback 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.

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Excel and CSV Data Analysisbytedance/deer-flow83k4 repos~2.2kAutomated safety check: PassMIT
StatsmodelszLanqing/codex-claude-academic-skills4.6k16 repos~4.9kAutomated safety check: PassBSD-3-Clause
Scientific Figure MakingChenLiu-1996/figures4papers8.1k—~557Automated safety check: PassCustom licence

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Works with

Categories

Questions about Python Heredoc Fallback

What does Python Heredoc Fallback do?

Use shell Python heredoc as fallback when code sandbox fails. Python Heredoc Fallback is an agent skill from HKUDS/OpenSpace.

When should I use Python Heredoc Fallback?

Python Heredoc Fallback fits situations like: data & Analytics work in your project.

How do I install Python Heredoc Fallback in Claude Code?

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

How do I install Python Heredoc Fallback in Codex?

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

Can I use Python Heredoc Fallback 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 python-heredoc-fallback -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/python-heredoc-fallback, .gemini/skills/python-heredoc-fallback, .github/skills/python-heredoc-fallback and .opencode/skills/python-heredoc-fallback in your project.

What does Python Heredoc Fallback need to run?

Going by SKILL.md and its folder, Python Heredoc Fallback needs the command-line tools its instructions call (python3 and pip). Our summary lists: Python 3.

Does Python Heredoc Fallback access the network?

SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Python Heredoc Fallback 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 Python Heredoc Fallback use?

Python Heredoc Fallback 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 Python Heredoc Fallback use?

About 873 tokens (SKILL.md is roughly 3.5k 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 Python Heredoc Fallback?

Skills that share tags, products or a category with Python Heredoc Fallback: Scikit Learn (zLanqing/codex-claude-academic-skills, 4.6k stars), TimesFM Forecasting (google-research/timesfm, 34k stars), Excel and CSV Data Analysis (bytedance/deer-flow, 83k stars) and Statsmodels (zLanqing/codex-claude-academic-skills, 4.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Python Heredoc Fallback?

HKUDS (a GitHub organization) maintains it in HKUDS/OpenSpace, which has 7,743 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.