Scikit Learn
zLanqing/codex-claude-academic-skills
Machine learning in Python with scikit-learn. An agent skill from zLanqing/codex-claude-academic-skills.
CEO checks consistency of agent outputs during post-completion review
Install Cross Validation
$ npx skills add chekusu/wanman --skill cross-validation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install chekusu/wanman cross-validation --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/chekusu/wanman.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/core/skills/cross-validation .claude/skills/cross-validation && 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 "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .claude/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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/chekusu/wanman/tree/main/packages/core/skills/cross-validationType 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 chekusu/wanman --skill cross-validation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install chekusu/wanman cross-validation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/chekusu/wanman.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/core/skills/cross-validation .agents/skills/cross-validation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .agents/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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 chekusu/wanman --skill cross-validation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install chekusu/wanman cross-validation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/chekusu/wanman.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/core/skills/cross-validation .cursor/skills/cross-validation && 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 "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .cursor/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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/chekusu/wanman.git --path packages/core/skills/cross-validation--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 chekusu/wanman --skill cross-validation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install chekusu/wanman cross-validation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/chekusu/wanman.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/core/skills/cross-validation .gemini/skills/cross-validation && 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 "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .gemini/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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 chekusu/wanman cross-validationInstalls 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 chekusu/wanman --skill cross-validation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/chekusu/wanman.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/core/skills/cross-validation .github/skills/cross-validation && 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 "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .github/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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 chekusu/wanman --skill cross-validation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install chekusu/wanman cross-validation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/chekusu/wanman.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/core/skills/cross-validation .opencode/skills/cross-validation && 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 "cross-validation" agent skill from https://github.com/chekusu/wanman/tree/main/packages/core/skills/cross-validation into .opencode/skills/cross-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-validation", 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
cross-validation- GitHub stars
- 688
- Token cost
- ~824 tokens
- SKILL.md length
- 230 words
- Files
- 1
- Skills in repo
- 6
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
CEO checks consistency of agent outputs during post-completion review
- Works in 4 steps: Collect All Output Files → Extract Key Facts → Compare for Consistency → …
- Tasks that involve Machine learning
- SKILL.md covers When to Execute, Validation Process, Authoritative Document Priority and Common Inconsistency Patterns, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cross Validation is an agent skill from chekusu/wanman. CEO checks consistency of agent outputs during post-completion review
Its SKILL.md is about 820 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, covering Machine learning. The repository describes itself as: wanman is an open-source agent matrix runtime inspired by Japanese one-man trains. It lets human users step back into an observer role while local agent runtimes coordinate… The licence is Apache-2.0.
When your agent uses it
- Tasks that involve Machine learning
Example prompts
- “/cross-validation”
Workflow steps
4 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 d3a8138. 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 bash).
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
Cross Validation loads about 824 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 230 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 chekusu/wanman at commit d3a8138, republished under its Apache-2.0 licence (© chekusu). 230 words, ~824 tokens.
Download SKILL.mdSave it as
.claude/skills/cross-validation/SKILL.md (or your agent's skills folder).- name
- cross-validation
- description
- CEO checks consistency of agent outputs during post-completion review
Output Consistency Validation
When to Execute
After wanman task list shows all tasks with status=done, perform output consistency validation before inspecting artifact data.
Validation Process
Step 1: Collect All Output Files
# List all agent output files
find /workspace/agents -name "*.md" -o -name "*.html" | grep -v CLAUDE.md | sortStep 2: Extract Key Facts
Extract the following key information from each file:
| Fact Type | Example |
|---|---|
| Brand name | "COFFEE TO" |
| Tagline | "Coffee to, begin." |
| Address | 2-XX-XX Kamimeguro, Meguro-ku, Tokyo |
| Business hours | 8:00 - 20:00 |
| Opening date | 2026.4.1 |
| Menu prices | Drip Coffee ¥500 |
| Instagram handle | @coffee.to.nakameguro |
| Color HEX values | #2D1B0E, #F5E6D3 |
Step 3: Compare for Consistency
Cross-check file by file:
Brand guide (marketing) brand name ←→ Website (dev) brand name
Brand guide tagline ←→ Poster (marketing) tagline
Brand guide colors ←→ Website CSS colors
Financial report pricing ←→ Website menu prices
Poster opening date ←→ Social media content date
Poster address ←→ Website addressStep 4: Handle Inconsistencies
When inconsistencies are found, defer to the earliest completed authoritative document (usually the brand guide) and create a correction task:
# Example: website brand name does not match brand guide
wanman task create "Fix website brand name: unify the brand name on the website from 'KAWA' to 'COFFEE TO' as specified in the brand guide. Update all brand names, taglines, and Instagram handles in index.html. Reference: /workspace/agents/output/marketing/brand-design.md" --assign dev --priority 1Authoritative Document Priority
When information conflicts, follow this order of precedence:
- Brand guide — Brand name, tagline, visual style
- Financial report — Prices, cost data
- Market research — Competitor data, market data
- Website/posters — Must align with the above (not a source of truth)
Common Inconsistency Patterns
| Pattern | Cause | Fix |
|---|---|---|
| Website brand name differs from brand guide | Dev started website before brand design was complete | Create correction task for dev |
| Poster prices differ from financial pricing | Marketing and finance worked independently | Defer to finance, fix the poster |
| Social media dates differ from poster dates | Same agent produced outputs at different times | Unify to the latest confirmed date |
Preventive Measures
When creating tasks, use --after to declare dependencies:
# Brand design must be completed first
brand_id=$(wanman task create "Brand design" --assign marketing --priority 1 | grep -o '[a-f0-9-]\{36\}')
# Website development depends on brand design
wanman task create "Website development: based on the brand guide..." --assign dev --priority 5 --after $brand_id
# Poster design also depends on brand design
wanman task create "Opening poster: based on the brand guide..." --assign marketing --priority 4 --after $brand_id© chekusu, 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 packages/core/skills/cross-validation of chekusu/wanman.
Open the folder on GitHubat commit d3a8138
Compare with similar skills
Cross Validation 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 |
|---|---|---|---|---|---|---|
| Cross Validation this skillchekusu/wanman | 688 | — | ~824 | Automated safety check: Pass | Apache-2.0 | |
| Scikit LearnzLanqing/codex-claude-academic-skills | 4.6k | 17 repos | ~3.9k | Automated safety check: Pass | BSD-3-Clause | |
| Senior Data ScientistRaidriar7170/hermes-skilleval | 125 | 6 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Agentic Kaggle WorkflowFrankS-IntelLab/agentic-kaggle-skill | 188 | — | ~4k | Automated safety check: Pass | MIT | |
| Retention Analysisliangdabiao/claude-data-analysis-ultra-main | 290 | 1 repos | ~1.3k | Automated safety check: Notes | None | |
| Geomlitalo-goncalves/geoML | 109 | — | ~4.2k | Automated safety check: Pass | GPL-3.0 |
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Agentic Kaggle Workflow
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Working knowledge of the geoML Python package (github.com/italo-goncalves/geoML): variational Gaussian processes for spatial data, implicit geological modelling, block models, drillhole data…
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Related
Categories
Questions about Cross Validation
What does Cross Validation do?
CEO checks consistency of agent outputs during post-completion review. Cross Validation is an agent skill from chekusu/wanman.
When should I use Cross Validation?
Cross Validation fits situations like: tasks that involve Machine learning.
How do I install Cross Validation in Claude Code?
Run `npx skills add chekusu/wanman --skill cross-validation -a claude-code`. Or copy the skill folder (packages/core/skills/cross-validation in chekusu/wanman) into .claude/skills/cross-validation in your project. Claude Code loads it when a task matches its description.
How do I install Cross Validation in Codex?
Run `npx skills add chekusu/wanman --skill cross-validation -a codex`. Or copy the skill folder (packages/core/skills/cross-validation in chekusu/wanman) into .agents/skills/cross-validation in your project. Codex loads it when a task matches its description.
Can I use Cross Validation 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 chekusu/wanman --skill cross-validation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cross-validation, .gemini/skills/cross-validation, .github/skills/cross-validation and .opencode/skills/cross-validation in your project.
What does Cross Validation need to run?
SKILL.md names no scripts, command-line tools or credentials: Cross Validation is instructions for the agent only.
Does Cross Validation 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 Cross Validation 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 Cross Validation use?
Cross Validation 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 Cross Validation use?
About 824 tokens (SKILL.md is roughly 3.3k 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 Cross Validation?
Skills that share tags, products or a category with Cross Validation: Scikit Learn (zLanqing/codex-claude-academic-skills, 4.6k stars), Senior Data Scientist (Raidriar7170/hermes-skilleval, 125 stars), Agentic Kaggle Workflow (FrankS-IntelLab/agentic-kaggle-skill, 188 stars) and Retention Analysis (liangdabiao/claude-data-analysis-ultra-main, 290 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cross Validation?
chekusu (a GitHub organization) maintains it in chekusu/wanman, which has 688 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on June 14, 2026.
Source: chekusu/wanman on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.