Agent skill

PDF Verification

Verify PDF page counts and file integrity programmatically using PyPDF2 after generation

Install PDF Verification

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a claude-code

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

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification --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/pdf-verification .claude/skills/pdf-verification && 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/

Paste into Claude Code

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .claude/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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

$skill-installer install https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification

Type 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.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/benchmarks/gdpval/skills/pdf-verification .agents/skills/pdf-verification && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .agents/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/benchmarks/gdpval/skills/pdf-verification .cursor/skills/pdf-verification && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .cursor/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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

$ gemini skills install https://github.com/HKUDS/OpenSpace.git --path benchmarks/gdpval/skills/pdf-verification

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/benchmarks/gdpval/skills/pdf-verification .gemini/skills/pdf-verification && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .gemini/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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.

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification

Installs 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).

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .github/skills && cp -r skills-src/benchmarks/gdpval/skills/pdf-verification .github/skills/pdf-verification && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .github/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill pdf-verification -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace pdf-verification --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/benchmarks/gdpval/skills/pdf-verification .opencode/skills/pdf-verification && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "pdf-verification" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/pdf-verification into .opencode/skills/pdf-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "pdf-verification", 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: pdf-verification
GitHub stars: 7.7k
Token cost: ~977 tokens
SKILL.md length: 186 words
Files: 2
Skills in repo: 199
Repo updated: Aug 12, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Verify PDF page counts and file integrity programmatically using PyPDF2 after generation

Works in 4 steps: Install PyPDF2 (if needed) → Verify Page Count and Integrity → Verify Multiple PDFs → …
Tasks that involve PDF
SKILL.md covers Purpose, When to Use, Verification Steps and Best Practices, plus 2 more sections
Calls python and pip

What it does

PDF Verification is an agent skill from HKUDS/OpenSpace. Verify PDF page counts and file integrity programmatically using PyPDF2 after generation

Its SKILL.md is about 980 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Documents & Office, covering PDF. It works with pypdf. 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 PDF

Example prompts

“/pdf-verification”

Requirements

Python 3

Workflow steps

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

Install PyPDF2 (if needed)
Verify Page Count and Integrity
Verify Multiple PDFs
Check File Size (Optional)

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:
- python
- 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

PDF Verification loads about 977 tokens when it runs. Until then it costs about 26 tokens; SKILL.md has 186 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~26
When it runs · the whole SKILL.md, loaded when a task matches: ~977

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). 186 words, ~977 tokens.

Download SKILL.mdSave it as .claude/skills/pdf-verification/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: pdf-verification
description: Verify PDF page counts and file integrity programmatically using PyPDF2 after generation

PDF Verification Skill

Purpose

After generating PDF files, always verify page counts and file integrity programmatically before declaring task completion. This catches formatting issues, empty pages, and corrupted files early.

When to Use

After any PDF generation task
When specific page counts are required
Before marking a PDF-related task as complete

Verification Steps

1. Install PyPDF2 (if needed)

bash

pip install PyPDF2

2. Verify Page Count and Integrity

Use run_shell to execute a Python verification script:

bash

python -c "
from PyPDF2 import PdfReader
import sys

def verify_pdf(filepath, expected_pages=None):
    try:
        reader = PdfReader(filepath)
        actual_pages = len(reader.pages)
        print(f'✓ {filepath}: {actual_pages} pages')
        
        if expected_pages and actual_pages != expected_pages:
            print(f'✗ Page count mismatch: expected {expected_pages}, got {actual_pages}')
            return False
        
        # Check file is not empty/corrupted
        if actual_pages == 0:
            print(f'✗ Empty PDF: {filepath}')
            return False
        
        return True
    except Exception as e:
        print(f'✗ Error reading {filepath}: {e}')
        return False

# Verify each PDF
results = []
results.append(verify_pdf('output.pdf', expected_pages=2))
print(f'All checks passed: {all(results)}')
sys.exit(0 if all(results) else 1)
"

3. Verify Multiple PDFs

For tasks with multiple PDFs, verify each one:

bash

python -c "
from PyPDF2 import PdfReader

pdfs = {
    'listings.pdf': 2,
    'map.pdf': 1,
    'summary.pdf': 1
}

all_passed = True
for filepath, expected in pdfs.items():
    try:
        reader = PdfReader(filepath)
        actual = len(reader.pages)
        status = '✓' if actual == expected else '✗'
        print(f'{status} {filepath}: {actual}/{expected} pages')
        if actual != expected:
            all_passed = False
    except Exception as e:
        print(f'✗ {filepath}: {e}')
        all_passed = False

print(f'Verification: {\"PASSED\" if all_passed else \"FAILED\"}')
"

4. Check File Size (Optional)

Add file size validation to catch empty or near-empty files:

bash

python -c "
import os
from PyPDF2 import PdfReader

filepath = 'output.pdf'
min_size = 1000  # minimum bytes

file_size = os.path.getsize(filepath)
if file_size < min_size:
    print(f'✗ File too small: {file_size} bytes')
else:
    reader = PdfReader(filepath)
    print(f'✓ {filepath}: {len(reader.pages)} pages, {file_size} bytes')
"

Best Practices

Verify immediately after generation - Don't wait until the end of the task
Check all required PDFs - Verify each file meets specifications
Fail fast - If verification fails, regenerate before proceeding
Log results - Print verification results for debugging
Set reasonable minimums - Use file size checks to catch empty outputs

Common Issues Caught

Wrong page counts (extra blank pages, missing content)
Corrupted or unreadable PDF files
Empty PDFs (0 pages)
Files that appear generated but contain no actual content

Example Task Completion Check

bash

# Final verification before marking task complete
python -c "
from PyPDF2 import PdfReader
import sys

required = {'listings.pdf': 2, 'map.pdf': 1}
passed = True

for f, pages in required.items():
    try:
        actual = len(PdfReader(f).pages)
        if actual != pages:
            print(f'FAIL: {f} has {actual} pages, expected {pages}')
            passed = False
    except Exception as e:
        print(f'FAIL: Cannot read {f}: {e}')
        passed = False

if passed:
    print('SUCCESS: All PDFs verified')
    sys.exit(0)
else:
    sys.exit(1)
"

Files

SKILL.md and 1 other file in benchmarks/gdpval/skills/pdf-verification of HKUDS/OpenSpace.

SKILL.md
.skill_id

Open the folder on GitHubat commit 3827781

Compare with similar skills

PDF Verification 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.

PDF Verification compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
PDF Verification this skillHKUDS/OpenSpace	7.7k	—	~977	Automated safety check: Pass	MIT	1 mo ago
PDFnuoyimanaituling/manus-x	830	—	~985	Automated safety check: Pass	None	8 mo ago
PDFeinverne/dotfiles	121	47 repos	~1.8k	Automated safety check: Pass	Proprietary	29 days ago
Reportlabjimmc414/Kosmos	594	1 repos	~4.2k	Automated safety check: Pass	None	4 days ago
PDFguyi-a/pi-ling	106	—	~3.3k	Automated safety check: Pass	MIT	22 days ago
PDF ReadingWide-Moat/open-computer-use	126	1 repos	~2.7k	Automated safety check: Pass	Proprietary	3 days ago

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Questions about PDF Verification

What does PDF Verification do?

Verify PDF page counts and file integrity programmatically using PyPDF2 after generation. PDF Verification is an agent skill from HKUDS/OpenSpace.

When should I use PDF Verification?

PDF Verification fits situations like: tasks that involve PDF.

How do I install PDF Verification in Claude Code?

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

How do I install PDF Verification in Codex?

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

Can I use PDF Verification 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 pdf-verification -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pdf-verification, .gemini/skills/pdf-verification, .github/skills/pdf-verification and .opencode/skills/pdf-verification in your project.

What does PDF Verification need to run?

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

Does PDF Verification 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 PDF Verification 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 PDF Verification use?

PDF Verification 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 PDF Verification use?

About 977 tokens (SKILL.md is roughly 3.9k 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 PDF Verification?

Skills that share tags, products or a category with PDF Verification: PDF (nuoyimanaituling/manus-x, 830 stars), PDF (einverne/dotfiles, 121 stars), Reportlab (jimmc414/Kosmos, 594 stars) and PDF (guyi-a/pi-ling, 106 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains PDF Verification?

HKUDS (a GitHub organization) maintains it in HKUDS/OpenSpace, which has 7,749 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.

Install PDF Verification

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

PDF Verification Skill

Purpose

When to Use

Verification Steps

1. Install PyPDF2 (if needed)

2. Verify Page Count and Integrity

3. Verify Multiple PDFs

4. Check File Size (Optional)

Best Practices

Common Issues Caught

Example Task Completion Check

Files

Compare with similar skills

Similar skills

More from HKUDS/OpenSpace

Related

Questions about PDF Verification