Tabler Backward Compatibility
tabler/tabler
Keeps changes to @tabler/core backward compatible so patch and minor releases never break projects, covering what counts as public API and how to alias renames.
Backwards compatibility rules when changing element controllers in apps/prairielearn/elements/.
Custom licenceAuto-check passed
Install Element Backwards Compat
$ npx skills add PrairieLearn/PrairieLearn --skill element-backwards-compat -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-backwards-compat --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-backwards-compat .claude/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .claude/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compatType 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-backwards-compat -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-backwards-compat --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-backwards-compat .agents/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .agents/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compat -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-backwards-compat --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-backwards-compat .cursor/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .cursor/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compat--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-backwards-compat -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PrairieLearn/PrairieLearn element-backwards-compat --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-backwards-compat .gemini/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .gemini/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compatInstalls 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-backwards-compat -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-backwards-compat .github/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .github/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compat -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-backwards-compat --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-backwards-compat .opencode/skills/element-backwards-compat && 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-backwards-compat" agent skill from https://github.com/PrairieLearn/PrairieLearn/tree/master/.agents/skills/element-backwards-compat into .opencode/skills/element-backwards-compat/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "element-backwards-compat", 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-backwards-compat- GitHub stars
- 512
- Token cost
- ~401 tokens
- SKILL.md length
- 203 words
- Files
- 1
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Backwards compatibility rules when changing element controllers in apps/prairielearn/elements/.
- Works in 2 steps: Adding a new key to a persisted dict?… → Renaming, removing, or changing the…
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Element Backwards Compat is an agent skill from PrairieLearn/PrairieLearn. Backwards compatibility rules when changing element controllers in apps/prairielearn/elements/.
Its SKILL.md is about 400 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Online problem-driven learning system.
Example prompts
- “Use the element-backwards-compat skill to backward compatibility rules when changing element controllers in apps/prairielearn/elements/”
- “/element-backwards-compat”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Adding a new key to a persisted dict? Every reader in every element function must use dict.get(key, default) with a sensible default…
- Renaming, removing, or changing the semantics of a persisted key? Don't. Keep the old key alongside the new one and have readers fall back…
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
No scripts in the folder and no shell commands in SKILL.md.
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 Backwards Compat loads about 401 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 203 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 203 words (~401 tokens).
“Several dict-shaped fields on the data dict that an element controller receives are persisted to the database and read back by future invocations. Existing variants and submissions are not re-generated when element code changes, so any new key added to…”
- name
- element-backwards-compat
Files
Just SKILL.md in .agents/skills/element-backwards-compat of PrairieLearn/PrairieLearn.
Open the folder on GitHubat commit 076bf1b
Compare with similar skills
Element Backwards Compat 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 Backwards Compat this skillPrairieLearn/PrairieLearn | 512 | — | ~401 | Automated safety check: Pass | Custom licence | |
| Tabler Backward Compatibilitytabler/tabler | 42k | — | ~4k | Automated safety check: Pass | MIT | |
| Review Backward Compatibilityruby-git/ruby-git | 1.8k | — | ~2.4k | Automated safety check: Pass | MIT | |
| Make Changesremix-run/remix | 33k | — | ~2.4k | Automated safety check: Pass | MIT | |
| Orch Change Featureaffaan-m/ECC | 274k | 1 repos | ~420 | Automated safety check: Pass | MIT | |
| Decorative Elementsthedaviddias/Front-End-Checklist | 74k | — | ~672 | Automated safety check: Pass | MIT |
Similar skills
Review Backward Compatibility
ruby-git/ruby-git
Audits Git::Lib methods for backward compatibility after commands are moved to Git::Commands:: classes.
Make Changes
remix-run/remix
Create or update Remix repo change files under packages//.changes.
Orch Change Feature
affaan-m/ECC
Orchestrate altering an existing, working feature to new desired behavior — update its tests to the new spec, change the implementation to match, review, and gated commit.
Decorative Elements
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing rendered HTML, interactive components, or design-system patterns related to Hide decorative elements from assistive technology.
- Official
Scaffold Element
remotion-dev/remotion
Scaffold a new Remotion Element for development in the docs Remotion Studio.
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Questions about Element Backwards Compat
What does Element Backwards Compat do?
Backwards compatibility rules when changing element controllers in apps/prairielearn/elements/. Element Backwards Compat is an agent skill from PrairieLearn/PrairieLearn. Backwards compatibility rules when changing element controllers in apps/prairielearn/elements/.
How do I install Element Backwards Compat in Claude Code?
Run `npx skills add PrairieLearn/PrairieLearn --skill element-backwards-compat -a claude-code`. Or copy the skill folder (.agents/skills/element-backwards-compat in PrairieLearn/PrairieLearn) into .claude/skills/element-backwards-compat in your project. Claude Code loads it when a task matches its description.
How do I install Element Backwards Compat in Codex?
Run `npx skills add PrairieLearn/PrairieLearn --skill element-backwards-compat -a codex`. Or copy the skill folder (.agents/skills/element-backwards-compat in PrairieLearn/PrairieLearn) into .agents/skills/element-backwards-compat in your project. Codex loads it when a task matches its description.
Can I use Element Backwards Compat 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-backwards-compat -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-backwards-compat, .gemini/skills/element-backwards-compat, .github/skills/element-backwards-compat and .opencode/skills/element-backwards-compat in your project.
What does Element Backwards Compat need to run?
SKILL.md names no scripts, command-line tools or credentials: Element Backwards Compat is instructions for the agent only.
Does Element Backwards Compat 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 Backwards Compat 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 Backwards Compat use?
Element Backwards Compat 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 Backwards Compat use?
About 401 tokens (SKILL.md is roughly 1.6k 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 Backwards Compat?
Skills that share tags, products or a category with Element Backwards Compat: Tabler Backward Compatibility (tabler/tabler, 42k stars), Review Backward Compatibility (ruby-git/ruby-git, 1.8k stars), Make Changes (remix-run/remix, 33k stars) and Orch Change Feature (affaan-m/ECC, 274k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Element Backwards Compat?
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.