Exploratory Data Analysis
spacering-net/codeg
Perform comprehensive exploratory data analysis on scientific data files across 200+ file formats.
A skill for systematically generating and validating CSS/XPath selectors for web page data extraction.
Install Selector Generator
$ npx skills add revfactory/harness-100 --skill selector-generator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install revfactory/harness-100 selector-generator --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/revfactory/harness-100.git skills-src && mkdir -p .claude/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .claude/skills/selector-generator && 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 "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .claude/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generatorType 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 revfactory/harness-100 --skill selector-generator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install revfactory/harness-100 selector-generator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .agents/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .agents/skills/selector-generator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .agents/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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 revfactory/harness-100 --skill selector-generator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install revfactory/harness-100 selector-generator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .cursor/skills/selector-generator && 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 "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .cursor/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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/revfactory/harness-100.git --path en/37-web-scraper/.claude/skills/selector-generator--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 revfactory/harness-100 --skill selector-generator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install revfactory/harness-100 selector-generator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .gemini/skills/selector-generator && 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 "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .gemini/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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 revfactory/harness-100 selector-generatorInstalls 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 revfactory/harness-100 --skill selector-generator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .github/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .github/skills/selector-generator && 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 "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .github/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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 revfactory/harness-100 --skill selector-generator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install revfactory/harness-100 selector-generator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/en/37-web-scraper/.claude/skills/selector-generator .opencode/skills/selector-generator && 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 "selector-generator" agent skill from https://github.com/revfactory/harness-100/tree/main/en/37-web-scraper/.claude/skills/selector-generator into .opencode/skills/selector-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "selector-generator", 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
selector-generator- GitHub stars
- 1.3k
- Token cost
- ~872 tokens
- SKILL.md length
- 107 words
- Files
- 1
- Skills in repo
- 96
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
A skill for systematically generating and validating CSS/XPath selectors for web page data extraction.
- Requests like create selectors
- SKILL.md covers Target Agents, Selector Strategy Priority, Selector Pattern Recipes and XPath vs CSS Decision Criteria, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Data extraction patterns
What it does
Selector Generator is an agent skill from revfactory/harness-100. A skill for systematically generating and validating CSS/XPath selectors for web page data extraction. Use for requests like 'create selectors', 'CSS selectors', 'write XPath', 'data extraction patterns', 'parsing rules', etc. Note: directly operating browser DevTools is outside the scope of this skill.
Its SKILL.md is about 870 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Data & Analytics. The licence is Apache-2.0.
When your agent uses it
- Requests like create selectors
- Data extraction patterns
Example prompts
- “create selectors”
- “CSS selectors”
- “write XPath”
- “/selector-generator”
Requirements
- Python 3
What it can do on your machine
Read from SKILL.md and the folder at commit 8e8d35c. 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 python).
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
Selector Generator loads about 872 tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 107 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 revfactory/harness-100 at commit 8e8d35c, republished under its Apache-2.0 licence (© revfactory). 107 words, ~872 tokens.
Download SKILL.mdSave it as
.claude/skills/selector-generator/SKILL.md (or your agent's skills folder).- name
- selector-generator
- description
- A skill for systematically generating and validating CSS/XPath selectors for web page data extraction. Use for requests like 'create selectors', 'CSS selectors', 'write XPath', 'data extraction patterns', 'parsing rules', etc. Note: directly operating browser DevTools is outside the scope of this skill.
Selector Generator — CSS/XPath Selector Generation + Validation
A skill that enhances parser-engineer's selector authoring capabilities.
Target Agents
- parser-engineer — Designs accurate selectors during HTML parsing
- monitor-operator — Implements selector change detection logic
Selector Strategy Priority
1st: Unique ID -> #product-price
2nd: data-* attributes -> [data-testid="price"]
3rd: Semantic classes -> .product-price
4th: ARIA attributes -> [aria-label="price"]
5th: Structural selectors -> article > .info > span
6th: Text XPath -> //span[contains(text(),"$")]Patterns to Avoid
| Pattern | Problem | Alternative |
|---|---|---|
.css-1a2b3c | CSS-in-JS hash changes | Parent semantic element |
div>div>div>span | Breaks on structure changes | Meaningful class |
:nth-child(7) alone | Breaks when elements change | Class + nth combination |
Selector Pattern Recipes
Product Listings
selectors = {
"container": "ul.product-list > li",
"name": ".product-name, h3.title",
"price": {
"current": ".sale-price, [data-price]",
"original": ".original-price, del"
},
"image": "img.product-image::attr(src)",
"link": "a.product-link::attr(href)",
"pagination": {
"next": "a.next, [rel='next']",
"total": ".total-pages"
}
}Forums/News
selectors = {
"article_list": "article, .post-item",
"title": "h2 > a, .article-title",
"author": ".author, .writer",
"date": "time::attr(datetime), .date",
"content": "article .content, .post-body"
}Tables
def table_to_dicts(html):
headers = [th.text for th in select("thead th")]
return [
{h: cell.text for h, cell in zip(headers, row.select("td"))}
for row in select("tbody tr")
]XPath vs CSS Decision Criteria
| Situation | Recommendation | Example |
|---|---|---|
| ID/class-based | CSS | #price |
| Text contains search | XPath | //span[contains(text(),"$")] |
| Parent traversal | XPath | //span[@class="price"]/parent::div |
| Sibling relationship | XPath | //dt[text()="Price"]/following-sibling::dd |
| Conditional | XPath | //div[@class="item" and .//span[@class="sale"]] |
Selector Robustness Score (0-100)
+30: ID-based
+25: data-testid
+20: Semantic class
+15: ARIA attribute
-10: nth-child alone
-20: Hash class
-30: 5+ level nesting
80-100: Stable | 60-79: Moderate | 40-59: Fragile | 0-39: RiskyChange Detection Pattern
selector_health = {
"selector": ".product-price",
"expected_pattern": r"[\d,.]+",
"expected_count_min": 1,
"fallback_selectors": ["[data-price]", "span.price"],
"status": "active" # active | degraded | broken
}Data Cleansing Pipeline
def clean_price(raw: str) -> int:
return int(re.sub(r'[^\d]', '', raw))
def clean_date(raw: str) -> str:
# Various formats -> ISO 8601 conversion
def clean_url(raw: str, base: str) -> str:
return urljoin(base, raw)© revfactory, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in en/37-web-scraper/.claude/skills/selector-generator of revfactory/harness-100.
Open the folder on GitHubat commit 8e8d35c
Compare with similar skills
Selector Generator 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 |
|---|---|---|---|---|---|---|
| Selector Generator this skillrevfactory/harness-100 | 1.3k | — | ~872 | Automated safety check: Pass | Apache-2.0 | |
| Exploratory Data Analysisspacering-net/codeg | 3.8k | 15 repos | ~3.6k | Automated safety check: Pass | MIT | |
| MatplotlibzLanqing/codex-claude-academic-skills | 4.6k | 18 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Scikit LearnzLanqing/codex-claude-academic-skills | 4.6k | 17 repos | ~3.9k | Automated safety check: Pass | BSD-3-Clause | |
| Chart Visualizationbytedance/deer-flow | 83k | 2 repos | ~840 | Automated safety check: Pass | MIT | |
| TimesFM Forecastinggoogle-research/timesfm | 34k | — | ~4.7k | Automated safety check: Pass | Apache-2.0 |
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Categories
Questions about Selector Generator
What does Selector Generator do?
A skill for systematically generating and validating CSS/XPath selectors for web page data extraction. Selector Generator is an agent skill from revfactory/harness-100. A skill for systematically generating and validating CSS/XPath selectors for web page data extraction.
When should I use Selector Generator?
Selector Generator fits situations like: requests like create selectors; data extraction patterns.
How do I install Selector Generator in Claude Code?
Run `npx skills add revfactory/harness-100 --skill selector-generator -a claude-code`. Or copy the skill folder (en/37-web-scraper/.claude/skills/selector-generator in revfactory/harness-100) into .claude/skills/selector-generator in your project. Claude Code loads it when a task matches its description.
How do I install Selector Generator in Codex?
Run `npx skills add revfactory/harness-100 --skill selector-generator -a codex`. Or copy the skill folder (en/37-web-scraper/.claude/skills/selector-generator in revfactory/harness-100) into .agents/skills/selector-generator in your project. Codex loads it when a task matches its description.
Can I use Selector Generator 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 revfactory/harness-100 --skill selector-generator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/selector-generator, .gemini/skills/selector-generator, .github/skills/selector-generator and .opencode/skills/selector-generator in your project.
What does Selector Generator need to run?
SKILL.md names no scripts, command-line tools or credentials: Selector Generator is instructions for the agent only. Our summary lists: Python 3.
Does Selector Generator 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 Selector Generator 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 Selector Generator use?
Selector Generator is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Selector Generator use?
About 872 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 Selector Generator?
Skills that share tags, products or a category with Selector Generator: Exploratory Data Analysis (spacering-net/codeg, 3.8k stars), Matplotlib (zLanqing/codex-claude-academic-skills, 4.6k stars), Scikit Learn (zLanqing/codex-claude-academic-skills, 4.6k stars) and Chart Visualization (bytedance/deer-flow, 83k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Selector Generator?
revfactory (a GitHub user) maintains it in revfactory/harness-100, which has 1,293 GitHub stars. The repository holds 96 skills in this directory. The repository was last updated on March 22, 2026.
Source: revfactory/harness-100 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.