Has Selector
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may…
Audit a Sim dynamic selector across its declaration, browser-safe manifest, server attachment, provider primitive, and selectors.execute security boundary.
$ npx skills add simstudioai/sim --skill validate-selector -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install simstudioai/sim validate-selector --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/simstudioai/sim.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/validate-selector .claude/skills/validate-selector && 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 "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .claude/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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/simstudioai/sim/tree/main/.agents/skills/validate-selectorType 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 simstudioai/sim --skill validate-selector -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install simstudioai/sim validate-selector --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/validate-selector .agents/skills/validate-selector && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .agents/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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 simstudioai/sim --skill validate-selector -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install simstudioai/sim validate-selector --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/validate-selector .cursor/skills/validate-selector && 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 "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .cursor/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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/simstudioai/sim.git --path .agents/skills/validate-selector--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 simstudioai/sim --skill validate-selector -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install simstudioai/sim validate-selector --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/validate-selector .gemini/skills/validate-selector && 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 "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .gemini/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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 simstudioai/sim validate-selectorInstalls 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 simstudioai/sim --skill validate-selector -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/validate-selector .github/skills/validate-selector && 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 "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .github/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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 simstudioai/sim --skill validate-selector -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install simstudioai/sim validate-selector --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/validate-selector .opencode/skills/validate-selector && 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 "validate-selector" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/validate-selector into .opencode/skills/validate-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-selector", 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.
validate-selectorAudit a Sim dynamic selector across its declaration, browser-safe manifest, server attachment, provider primitive, and selectors.execute security boundary.
Validate Selector is an agent skill from simstudioai/sim. Audit a Sim dynamic selector across its declaration, browser-safe manifest, server attachment, provider primitive, and selectors.execute security boundary. Use when reviewing selector correctness, secret handling, scope authorization, or dead selector-only routes.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
The repository describes itself as: Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders. The licence is Apache-2.0.
7 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit 546d4e7. It shows what the files ask for, not the result of running them.
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.
Shell commands in SKILL.md call:
bungitFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Validate Selector loads about 1.2k tokens when it runs. Until then it costs about 71 tokens; SKILL.md has 560 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.
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.
The full file from simstudioai/sim at commit 546d4e7, republished under its Apache-2.0 licence (© simstudioai). 560 words, ~1,243 tokens.
.claude/skills/validate-selector/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.Validate the complete path, not only the provider adapter.
Read:
apps/sim/lib/selectors/manifest.ts and types.ts.apps/sim/lib/selectors/context.ts.apps/sim/lib/selectors/server/registry.ts.Search literal API paths as well as TypeScript imports before deciding whether an old provider route or contract is unused.
local keys use the local registry).dependsOn names the required source fields; canonical pairs contribute only their active member.{{KEY}} references remain unresolved in the browser; runtime references are omitted,
while embedded interpolation is forwarded unresolved and rejected by the server executor.For provider and internal selectors, confirm the shared executor owns this order:
The attachment must not duplicate these shared checks. It must not accept a browser-provided module, provider, service, operation kind, origin, or scope list.
Review its destination classification:
fixed origins are code-defined.credential-bound origins are derived from or checked against the authorized credential.user-controlled destinations have an explicit policy for hidden use-only authentication and
network safety.Missing and inaccessible references, and missing, unauthorized, or provider-mismatched credentials,
must not become existence oracles. Hidden/server-only resolved plaintext, credentials, authentication
material, and raw upstream errors must not enter responses, query/cache/rate keys, selector result
caches, logs, audit metadata, redirects, or error messages. Browser-known literals and viewable
personal/shared values are not automatically protected plaintext, but the executor must still never
deliberately or wholesale echo selector context. Only intentionally projected, normalized
{ id, label, meta? } options and bounded cursors may cross the boundary.
Selector code adds no context, token, or result cache beyond the single accepted exception
described in the add-selector skill ("Wire the UI declaration").
Use existing Vitest/route/React Query patterns. Preserve valuable provider tests, but do not demand a per-selector authorization matrix. Shared executor tests should cover ordering, references, credential binding, sanitization, and safe errors; adapter tests should cover only special provider behavior.
Report critical, warning, and suggestion findings. Treat browser secret resolution, missing scope or credential authorization, unsafe destination binding, provider payload passthrough, and plaintext egress as critical.
Run the smallest relevant focused suites plus:
bun run --cwd apps/sim type-check
bun run check:api-validation:strict
bun run check:fork-dependent-coverage
bun run check:client-boundary
git diff --checkState which live-provider checks remain pending when disposable credentials are unavailable.
© simstudioai, 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
SKILL.md and 1 other file in .agents/skills/validate-selector of simstudioai/sim.
Open the folder on GitHubat commit 546d4e7
Validate Selector 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 |
|---|---|---|---|---|---|---|
| Validate Selector this skillsimstudioai/sim | 30k | — | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Has Selectorthedaviddias/Front-End-Checklist | 74k | — | ~547 | Automated safety check: Pass | MIT | |
| Dynamic Workflow Modeaffaan-m/ECC | 275k | 1 repos | ~1.3k | Automated safety check: Pass | MIT | |
| Molecular DynamicsK-Dense-AI/scientific-agent-skills | 48k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Dynamic WorkflowNousResearch/hermes-agent | 252k | — | ~2.8k | Automated safety check: Pass | MIT | |
| Declarative Agentsgithub/awesome-copilot | 40k | 1 repos | ~1.2k | Automated safety check: Pass | MIT |
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may…
affaan-m/ECC
Design task-local harnesses, eval gates, and reusable skill extraction for Claude dynamic workflow mode and other adaptive agent harnesses.
K-Dense-AI/scientific-agent-skills
Runs and analyzes molecular dynamics simulations with OpenMM and MDAnalysis.
NousResearch/hermes-agent
Plan-in-code fan-outs, adversarial verification, waves. An agent skill from NousResearch/hermes-agent.
github/awesome-copilot
Complete development kit for Microsoft 365 Copilot declarative agents with three comprehensive workflows (basic, advanced, validation), TypeSpec support, and Microsoft 365 Agents Toolkit integration
github/awesome-copilot
Skill converted from mcp-create-declarative-agent.prompt.md. An agent skill from github/awesome-copilot.
simstudioai/sim
Install, upgrade, and operate the Sim Helm chart on Kubernetes.
simstudioai/sim
Add a new table column type to Sim — registry entry, icon, storage shape, coercion, and the behavioral hooks the grid and API read.
simstudioai/sim
Add a code-defined table enrichment (registry entry) under apps/sim/enrichments/ backed by an ordered provider cascade, ensuring every provider tool it calls has hosted-key support.
simstudioai/sim
Add hosted API key support to a tool so Sim provides the key (metered and billed to the workspace) when a user has not brought their own.
simstudioai/sim
Add or upgrade a curated, immutable managed CLI for Sim Function sandboxes, including client-safe catalog metadata, a pinned server-only installation recipe, checksum and executable verification…
simstudioai/sim
Add or update a Sim dynamic selector using the shared manifest, server attachment, and selectors.execute path.
Audit a Sim dynamic selector across its declaration, browser-safe manifest, server attachment, provider primitive, and selectors.execute security boundary. Validate Selector is an agent skill from simstudioai/sim.execute security boundary.
Validate Selector fits situations like: reviewing selector correctness; secret handling; scope authorization; dead selector-only routes.
Run `npx skills add simstudioai/sim --skill validate-selector -a claude-code`. Or copy the skill folder (.agents/skills/validate-selector in simstudioai/sim) into .claude/skills/validate-selector in your project. Claude Code loads it when a task matches its description.
Run `npx skills add simstudioai/sim --skill validate-selector -a codex`. Or copy the skill folder (.agents/skills/validate-selector in simstudioai/sim) into .agents/skills/validate-selector in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add simstudioai/sim --skill validate-selector -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate-selector, .gemini/skills/validate-selector, .github/skills/validate-selector and .opencode/skills/validate-selector in your project.
Going by SKILL.md and its folder, Validate Selector needs the command-line tools its instructions call (bun and git).
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
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.
Validate Selector 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.
About 1.2k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Validate Selector: Has Selector (thedaviddias/Front-End-Checklist, 74k stars), Dynamic Workflow Mode (affaan-m/ECC, 275k stars), Molecular Dynamics (K-Dense-AI/scientific-agent-skills, 48k stars) and Dynamic Workflow (NousResearch/hermes-agent, 252k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
simstudioai (a GitHub organization) maintains it in simstudioai/sim, which has 29,792 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 8, 2026.
Source: simstudioai/sim on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.