MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
A skill your agent uses when changing or reviewing PrairieLearn element question.html contracts, including schema-level attributes/children, Python semantic validation, docs, and AI HTML validation…
Custom licenceAuto-check passed
Install Element Validation
$ npx skills add PrairieLearn/PrairieLearn --skill element-validation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-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/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/element-validation .claude/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .claude/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-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 PrairieLearn/PrairieLearn --skill element-validation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-validation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/element-validation .agents/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .agents/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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 PrairieLearn/PrairieLearn --skill element-validation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-validation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/element-validation .cursor/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .cursor/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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/PrairieLearn/PrairieLearn.git --path .agents/skills/element-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 PrairieLearn/PrairieLearn --skill element-validation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-validation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/element-validation .gemini/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .gemini/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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 PrairieLearn/PrairieLearn element-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 PrairieLearn/PrairieLearn --skill element-validation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/element-validation .github/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .github/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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 PrairieLearn/PrairieLearn --skill element-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 PrairieLearn/PrairieLearn element-validation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PrairieLearn/PrairieLearn.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/element-validation .opencode/skills/element-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 "element-validation" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-validation into .opencode/skills/element-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-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
element-validation- GitHub stars
- 512
- Token cost
- ~1.6k tokens
- SKILL.md length
- 776 words
- Files
- 1
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
A skill your agent uses when changing or reviewing PrairieLearn element question.html contracts, including schema-level attributes/children, Python semantic validation, docs, and AI HTML validation…
- Works in 5 steps: Check for… → If the schema module exists, update it… → If no schema module exists, prefer… → …
- Reviewing PrairieLearn element question.html contracts
- SKILL.md covers Ownership, Workflow, Runtime enforcement and Schema Modules, plus 1 more section
- Calls make
What it does
Element Validation is an agent skill from PrairieLearn/PrairieLearn. Use when changing or reviewing PrairieLearn element question.html contracts, including schema-level attributes/children, Python semantic validation, docs, and AI HTML validation support lists.
Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Python. The repository describes itself as: Online problem-driven learning system.
When your agent uses it
- Reviewing PrairieLearn element question.html contracts
- Including schema-level attributes/children
- Python semantic validation
- AI HTML validation support lists
Example prompts
- “/element-validation”
Requirements
- Python 3
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Check for apps/prairielearn/src/lib/element-schemas/elements/.ts.
- If the schema module exists, update it for schema-owned facts and run make update-element-schemas.
- If no schema module exists, prefer adding one for schema-owned facts before enabling AI generation for that element.
- Put semantic validation changes in apps/prairielearn/elements//.py.
- Update docs/elements/.md when the author-facing contract changes.
What it can do on your machine
Read from SKILL.md and the folder at commit 076bf1b. 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:
make
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
Element Validation loads about 1.6k tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 776 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 776 words (~1,644 tokens).
“Use this when a change affects what course authors may write in an element's question.html: tag names, attributes, child tags, accepted values, or validation errors for invalid markup.”
- name
- element-validation
Files
Just SKILL.md in .agents/skills/element-validation of PrairieLearn/PrairieLearn.
Open the folder on GitHubat commit 076bf1b
Compare with similar skills
Element 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 |
|---|---|---|---|---|---|---|
| Element Validation this skillPrairieLearn/PrairieLearn | 512 | — | ~1.6k | Automated safety check: Pass | Custom licence | |
| MCP Server Builderanthropics/skills | 180k | 62 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 48 repos | ~2k | Automated safety check: Pass | Proprietary | |
| NotebookLM Research AssistantPleasePrompto/notebooklm-skill | 7.8k | 13 repos | ~2.4k | Automated safety check: Notes | MIT | |
| Manim Video Productionbrowser-use/video-use | 28k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Related
Works with
Questions about Element Validation
What does Element Validation do?
A skill your agent uses when changing or reviewing PrairieLearn element question.html contracts, including schema-level attributes/children, Python semantic validation, docs, and AI HTML validation…. Element Validation is an agent skill from PrairieLearn/PrairieLearn.html contracts, including schema-level attributes/children, Python semantic validation, docs, and AI HTML validation support lists.
When should I use Element Validation?
Element Validation fits situations like: reviewing PrairieLearn element question.html contracts; including schema-level attributes/children; Python semantic validation; AI HTML validation support lists.
How do I install Element Validation in Claude Code?
Run `npx skills add PrairieLearn/PrairieLearn --skill element-validation -a claude-code`. Or copy the skill folder (.agents/skills/element-validation in PrairieLearn/PrairieLearn) into .claude/skills/element-validation in your project. Claude Code loads it when a task matches its description.
How do I install Element Validation in Codex?
Run `npx skills add PrairieLearn/PrairieLearn --skill element-validation -a codex`. Or copy the skill folder (.agents/skills/element-validation in PrairieLearn/PrairieLearn) into .agents/skills/element-validation in your project. Codex loads it when a task matches its description.
Can I use Element 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 PrairieLearn/PrairieLearn --skill element-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/element-validation, .gemini/skills/element-validation, .github/skills/element-validation and .opencode/skills/element-validation in your project.
What does Element Validation need to run?
Going by SKILL.md and its folder, Element Validation needs the command-line tools its instructions call (make). Our summary lists: Python 3.
Does Element 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 Element 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 Element Validation use?
Element Validation has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Element Validation use?
About 1.6k tokens (SKILL.md is roughly 6.6k 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 Element Validation?
Skills that share tags, products or a category with Element Validation: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Element Validation?
PrairieLearn (a GitHub organization) maintains it in PrairieLearn/PrairieLearn, which has 512 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 7, 2026.
Source: PrairieLearn/PrairieLearn on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.