Excel Workbook Editor
TokenRhythm/opensquilla
Inspects, edits in place or creates Microsoft Excel .xlsx workbooks with openpyxl, treating each cell as a typed number, string, datetime or formula value.
Create Excel files with openpyxl by falling back to shell-based Python heredoc when sandbox execution fails
Install Excel Heredoc Fallback
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallback --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .claude/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.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/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .claude/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallbackType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallback --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .agents/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .agents/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallback --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .cursor/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .cursor/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/HKUDS/OpenSpace.git --path benchmarks/gdpval/skills/excel-heredoc-fallback--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallback --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .gemini/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .gemini/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallbackInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .github/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .github/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .github/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install HKUDS/OpenSpace excel-heredoc-fallback --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/benchmarks/gdpval/skills/excel-heredoc-fallback .opencode/skills/excel-heredoc-fallback && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "excel-heredoc-fallback" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/excel-heredoc-fallback into .opencode/skills/excel-heredoc-fallback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "excel-heredoc-fallback", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
excel-heredoc-fallback- GitHub stars
- 7.8k
- Token cost
- ~1.6k tokens
- SKILL.md length
- 410 words
- Files
- 2
- Skills in repo
- 199
- Repo updated
- First seen
- Licence
- MIT
At a glance
Create Excel files with openpyxl by falling back to shell-based Python heredoc when sandbox execution fails
- Works in 10 steps: Attempt Sandbox Execution First → Detect Sandbox Failure → Fall Back to Shell Heredoc → …
- Tasks that involve Excel spreadsheets
- SKILL.md covers Overview, When to Use This Skill, Step-by-Step Instructions and Best Practices, plus 4 more sections
- Calls python3 and pip
What it does
Excel Heredoc Fallback is an agent skill from HKUDS/OpenSpace. Create Excel files with openpyxl by falling back to shell-based Python heredoc when sandbox execution fails
Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.
It sits in Documents & Office, covering Excel spreadsheets. It works with Microsoft Excel, Python and openpyxl. 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
- Tasks that involve Excel spreadsheets
Example prompts
- “/excel-heredoc-fallback”
Requirements
- Python 3
Workflow steps
10 steps, taken from the step headings in SKILL.md.
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:
python3pip
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
Excel Heredoc Fallback loads about 1.6k tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 410 words of instructions outside code blocks.
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). 410 words, ~1,598 tokens.
Download SKILL.mdSave it as
.claude/skills/excel-heredoc-fallback/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- excel-heredoc-fallback
- description
- Create Excel files with openpyxl by falling back to shell-based Python heredoc when sandbox execution fails
Excel Creation via Shell Heredoc Fallback
Overview
When creating Excel files with openpyxl, execute_code_sandbox may fail due to sandbox restrictions, missing dependencies, or permission issues. This skill provides a reliable fallback: execute Python code via run_shell using an inline heredoc script. This approach often succeeds where the sandbox fails and supports full openpyxl features including styling, formulas, and formatting.
When to Use This Skill
execute_code_sandboxfails when importing or using openpyxl- Sandbox shows errors about missing packages, permissions, or execution restrictions
- You need to create Excel files with advanced formatting (styles, colors, merged cells, formulas)
- Previous sandbox attempts have failed multiple times
Step-by-Step Instructions
Step 1: Attempt Sandbox Execution First
Always try execute_code_sandbox first, as it's cleaner and preferred when it works:
from openpyxl import Workbook
from openpyxl.styles import Font, Fill, PatternFill, Alignment
wb = Workbook()
ws = wb.active
ws['A1'] = 'Header'
ws['A1'].font = Font(bold=True)
wb.save('output.xlsx')Step 2: Detect Sandbox Failure
Watch for these failure indicators:
- ImportError for openpyxl or related modules
- Permission denied errors
- File write failures
- Repeated retry loops without success
- Timeout or resource errors
Step 3: Fall Back to Shell Heredoc
When sandbox fails, switch to run_shell with a Python heredoc:
python3 << 'EOF'
from openpyxl import Workbook
from openpyxl.styles import Font, Fill, PatternFill, Alignment, Border, Side
# Create workbook
wb = Workbook()
ws = wb.active
ws.title = "Sheet1"
# Add data with formatting
ws['A1'] = 'Name'
ws['B1'] = 'Value'
ws['A1'].font = Font(bold=True, size=14)
ws['B1'].font = Font(bold=True, size=14)
# Add rows
data = [
['Item 1', 100],
['Item 2', 200],
['Item 3', 150],
]
for row_idx, row_data in enumerate(data, start=2):
for col_idx, value in enumerate(row_data, start=1):
cell = ws.cell(row=row_idx, column=col_idx, value=value)
cell.alignment = Alignment(horizontal='center')
# Add formulas if needed
ws['B5'] = '=SUM(B2:B4)'
# Save the file
wb.save('output.xlsx')
print("Excel file created successfully: output.xlsx")
EOFStep 4: Use run_shell Tool
Execute the heredoc via run_shell:
tool: run_shell
command: python3 << 'EOF'
[from openpyxl code here]
EOFStep 5: Verify File Creation
After execution, confirm the file was created:
tool: run_shell
command: ls -lh output.xlsxCheck the file size to ensure it's not empty (should be >1KB for typical spreadsheets).
Best Practices
1. Use Single-Quoted Heredoc Delimiter
Always use << 'EOF' (with quotes) to prevent shell variable expansion inside the Python code.
2. Include Error Handling
Add try/except blocks to catch and report issues:
try:
from openpyxl import Workbook
# ... your code ...
wb.save('output.xlsx')
print("SUCCESS: File created")
except Exception as e:
print(f"ERROR: {e}")
exit(1)Show full SKILL.md (170 more words)Show less
3. Print Confirmation Messages
Always include print statements that confirm success or report specific errors. This helps debug issues.
4. Use Absolute or Explicit Paths
When saving files, use explicit paths to avoid confusion:
wb.save('./output.xlsx') # Explicit current directory
# or
wb.save('/workspace/output.xlsx') # Absolute path5. Keep Scripts Concise
Heredoc scripts should be focused and not excessively long. If the Excel logic is complex, consider writing a separate .py file first using write_file, then executing it.
Advanced Formatting Examples
Cell Styling
from openpyxl.styles import Font, PatternFill, Alignment, Border, Side
# Define styles
bold_font = Font(bold=True, size=12)
header_fill = PatternFill(start_color='4472C4', end_color='4472C4', fill_type='solid')
center_align = Alignment(horizontal='center', vertical='center')
thin_border = Border(
left=Side(style='thin'),
right=Side(style='thin'),
top=Side(style='thin'),
bottom=Side(style='thin')
)
# Apply to cells
ws['A1'].font = bold_font
ws['A1'].fill = header_fill
ws['A1'].alignment = center_alignColumn Width and Row Height
ws.column_dimensions['A'].width = 20
ws.column_dimensions['B'].width = 15
ws.row_dimensions[1].height = 25Merged Cells
ws.merge_cells('A1:C1')
ws['A1'] = 'Merged Header'
ws['A1'].alignment = Alignment(horizontal='center')Multiple Sheets
wb.create_sheet(title='Summary')
wb.create_sheet(title='Details')
ws_summary = wb['Summary']
ws_details = wb['Details']Troubleshooting
| Issue | Solution |
|---|---|
| openpyxl not found | Add pip install openpyxl before Python script |
| File not created | Check working directory, use absolute paths |
| Permission denied | Ensure write permissions in target directory |
| Encoding issues | Python 3 handles UTF-8 by default; specify if needed |
| Large files time out | Increase run_shell timeout parameter |
Comparison: Sandbox vs. Shell Heredoc
| Aspect | execute_code_sandbox | run_shell heredoc |
|---|---|---|
| Preferred | Yes (cleaner) | No (fallback) |
| Dependencies | May be restricted | Uses system Python |
| File access | Sandboxed | Full filesystem |
| Styling support | Sometimes limited | Full support |
| Debugging | Logs in tool output | Full stdout/stderr |
Example Complete Workflow
# Step 1: Try sandbox
tool: execute_code_sandbox
code: |
from openpyxl import Workbook
wb = Workbook()
ws = wb.active
ws['A1'] = 'Test'
wb.save('test.xlsx')
# Step 2: If that fails, use shell heredoc
tool: run_shell
command: |
python3 << 'EOF'
from openpyxl import Workbook
from openpyxl.styles import Font, PatternFill
wb = Workbook()
ws = wb.active
ws['A1'] = 'Header'
ws['A1'].font = Font(bold=True)
ws['A1'].fill = PatternFill(start_color='FFFF00', fill_type='solid')
wb.save('test.xlsx')
print("Created: test.xlsx")
EOF
# Step 3: Verify
tool: run_shell
command: ls -lh test.xlsx© 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/excel-heredoc-fallback of HKUDS/OpenSpace.
- SKILL.md
- .skill_id
Open the folder on GitHubat commit 3827781
Compare with similar skills
Excel 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Excel Heredoc Fallback this skillHKUDS/OpenSpace | 7.8k | — | ~1.6k | Automated safety check: Pass | MIT | |
| Excel Workbook EditorTokenRhythm/opensquilla | 7.1k | — | ~1.6k | Automated safety check: Pass | Apache-2.0 | |
| Kimi XLSXthvroyal/kimi-skills | 238 | — | ~9.5k | Automated safety check: Pass | None | |
| Office XLSXopen-octo/octo-agent | 125 | — | ~1.8k | Automated safety check: Notes | MIT | |
| Cc Streaming Export Safetydoccker/cc-use-exp | 1.1k | — | ~2.2k | Automated safety check: Pass | Custom licence | |
| XLSXnexus-research-lab/nexus | 151 | — | ~501 | Automated safety check: Pass | Apache-2.0 |
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Related
Works with
Categories
Questions about Excel Heredoc Fallback
What does Excel Heredoc Fallback do?
Create Excel files with openpyxl by falling back to shell-based Python heredoc when sandbox execution fails. Excel Heredoc Fallback is an agent skill from HKUDS/OpenSpace.
When should I use Excel Heredoc Fallback?
Excel Heredoc Fallback fits situations like: tasks that involve Excel spreadsheets.
How do I install Excel Heredoc Fallback in Claude Code?
Run `npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a claude-code`. Or copy the skill folder (benchmarks/gdpval/skills/excel-heredoc-fallback in HKUDS/OpenSpace) into .claude/skills/excel-heredoc-fallback in your project. Claude Code loads it when a task matches its description.
How do I install Excel Heredoc Fallback in Codex?
Run `npx skills add HKUDS/OpenSpace --skill excel-heredoc-fallback -a codex`. Or copy the skill folder (benchmarks/gdpval/skills/excel-heredoc-fallback in HKUDS/OpenSpace) into .agents/skills/excel-heredoc-fallback in your project. Codex loads it when a task matches its description.
Can I use Excel 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 excel-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/excel-heredoc-fallback, .gemini/skills/excel-heredoc-fallback, .github/skills/excel-heredoc-fallback and .opencode/skills/excel-heredoc-fallback in your project.
What does Excel Heredoc Fallback need to run?
Going by SKILL.md and its folder, Excel Heredoc Fallback needs the command-line tools its instructions call (python3 and pip). Our summary lists: Python 3.
Does Excel 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 Excel 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 Excel Heredoc Fallback use?
Excel 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 Excel Heredoc Fallback use?
About 1.6k tokens (SKILL.md is roughly 6.4k 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 Excel Heredoc Fallback?
Skills that share tags, products or a category with Excel Heredoc Fallback: Excel Workbook Editor (TokenRhythm/opensquilla, 7.1k stars), Kimi XLSX (thvroyal/kimi-skills, 238 stars), Office XLSX (open-octo/octo-agent, 125 stars) and Cc Streaming Export Safety (doccker/cc-use-exp, 1.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Excel Heredoc Fallback?
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.