Frontend Guide
lightly-ai/lightly-studio
Read before writing or reviewing any frontend code in lightlystudioview - Svelte, TypeScript, or SvelteKit files.
Query boundaries with TanStack Query and Wellcrafted Results.
Install Query Layer
$ npx skills add EpicenterHQ/epicenter --skill query-layer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install EpicenterHQ/epicenter query-layer --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/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/query-layer .claude/skills/query-layer && 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 "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .claude/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layerType 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 EpicenterHQ/epicenter --skill query-layer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install EpicenterHQ/epicenter query-layer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/query-layer .agents/skills/query-layer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .agents/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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 EpicenterHQ/epicenter --skill query-layer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install EpicenterHQ/epicenter query-layer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/query-layer .cursor/skills/query-layer && 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 "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .cursor/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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/EpicenterHQ/epicenter.git --path .agents/skills/query-layer--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 EpicenterHQ/epicenter --skill query-layer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install EpicenterHQ/epicenter query-layer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/query-layer .gemini/skills/query-layer && 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 "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .gemini/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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 EpicenterHQ/epicenter query-layerInstalls 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 EpicenterHQ/epicenter --skill query-layer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/query-layer .github/skills/query-layer && 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 "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .github/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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 EpicenterHQ/epicenter --skill query-layer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install EpicenterHQ/epicenter query-layer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/query-layer .opencode/skills/query-layer && 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 "query-layer" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/query-layer into .opencode/skills/query-layer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-layer", 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
query-layer- GitHub stars
- 4.8k
- Token cost
- ~2.5k tokens
- SKILL.md length
- 873 words
- Files
- 4 (incl. references)
- Skills in repo
- 64
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Query boundaries with TanStack Query and Wellcrafted Results.
- Works in 6 steps: Use defineKeys for shared cache identity… → Use .options (no parentheses) - It's a… → Do not translate tagged errors by… → …
- Editing createQuery
- SKILL.md covers Reference Repositories, Upstream Grounding, Core Architecture and Wellcrafted Query API Shape, plus 7 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Query Layer is an agent skill from EpicenterHQ/epicenter. Query boundaries with TanStack Query and Wellcrafted Results. Use when editing createQuery, createMutation, resultQueryOptions, resultMutationOptions, defineQuery, defineMutation, defineKeys, shared cache identity, mutation lifecycle, or service-to-TanStack adapters.
Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/advanced-query-patterns.md`, `references/error-transformation-patterns.md` and `references/runtime-dependency-injection.md`).
It sits in Frontend & Design. It works with TanStack and Svelte. The repository describes itself as: Open-source, local-first apps.
When your agent uses it
- Editing createQuery
- ResultQueryOptions
- ResultMutationOptions
- Shared cache identity
Example prompts
- “/query-layer”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Use defineKeys for shared cache identity - Export the key map beside the owner
- Use .options (no parentheses) - It's a static object, wrap in accessor for Svelte
- Do not translate tagged errors by default - Pass service/operation errors through to the report boundary
- Services receive explicit app inputs - The consuming edge injects settings and device config
- Keep component lifecycle policy in svelte - This skill owns shared adapter shape and cache behavior
- Update cache deliberately - Use optimistic writes only when the cache owner and rollback path are explicit; otherwise invalidate or refetch
What it can do on your machine
Read from SKILL.md and the folder at commit f9441c8. 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 typescript and svelte).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
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
Query Layer loads about 2.5k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 70 tokens; SKILL.md has 873 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 873 words (~2,475 tokens).
“When TanStack Query behavior, Svelte adapter types, cache invalidation semantics, optimistic updates, or mutation lifecycle callbacks affect correctness, ask DeepWiki a narrow question against TanStack/query before relying on memory. Use it to orient, then verify decisive details against local installed…”
- name
- query-layer
- metadata.author
- epicenter
- metadata.version
- 3.0
Files
SKILL.md and 3 other files (references) in .agents/skills/query-layer of EpicenterHQ/epicenter.
- SKILL.md
- references/advanced-query-patterns.md
- references/error-transformation-patterns.md
- references/runtime-dependency-injection.md
Open the folder on GitHubat commit f9441c8
Compare with similar skills
Query Layer 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 |
|---|---|---|---|---|---|---|
| Query Layer this skillEpicenterHQ/epicenter | 4.8k | — | ~2.5k | Automated safety check: Pass | Custom licence | |
| Frontend Guidelightly-ai/lightly-studio | 896 | — | ~2.9k | Automated safety check: Pass | Apache-2.0 | |
| Tanstack Formexceptionless/Exceptionless | 2.5k | — | ~544 | Automated safety check: Pass | Apache-2.0 | |
| Tanstack Querybskimball/tanstack-hono | 119 | 1 repos | ~5.4k | Automated safety check: Pass | MIT | |
| Frontend Architectureexceptionless/Exceptionless | 2.5k | — | ~964 | Automated safety check: Pass | Apache-2.0 | |
| Tanstack Virtualudecode/plate | 17k | — | ~2.8k | Automated safety check: Pass | Custom licence |
Similar skills
Tanstack Form
exceptionless/Exceptionless
Build Svelte forms with TanStack Form, Zod validation, and API error mapping.
Tanstack Query
bskimball/tanstack-hono
Powerful asynchronous state management, server-state utilities, and data fetching for TS/JS, React, Vue, Solid, Svelte & Angular.
Frontend Architecture
exceptionless/Exceptionless
Apply Exceptionless Svelte conventions when adding or restructuring frontend features.
Tanstack Virtual
udecode/plate
Headless UI for virtualizing large element lists at 60FPS in TS/JS, React, Vue, Solid, Svelte, Lit & Angular.
Olore Tanstack Store Latest
olorehq/olore
Local tanstack-store documentation reference (latest). An agent skill from olorehq/olore.
More from EpicenterHQ/epicenter
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Write and maintain repository guidance across AGENTS.md, CLAUDE.md, and .agents/skills.
Consult Claude
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Get Claude Code's second opinion on a proposal or implementation.
Better Auth Security Best Practices
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Better Auth security hardening: rate limits, secrets, CSRF, trusted origins, cookies, sessions, OAuth tokens, and audit logging.
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Collapse test-shaped production boundaries while preserving behavior and coverage.
Collapse Pass
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Remove indirection that does not earn its boundary across a diff or package.
Error Handling
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Apply Wellcrafted Result patterns to fallible operations and preserve failures at boundaries.
Related
Categories
Questions about Query Layer
What does Query Layer do?
Query boundaries with TanStack Query and Wellcrafted Results. Query Layer is an agent skill from EpicenterHQ/epicenter. Query boundaries with TanStack Query and Wellcrafted Results.
When should I use Query Layer?
Query Layer fits situations like: editing createQuery; resultQueryOptions; resultMutationOptions; shared cache identity.
How do I install Query Layer in Claude Code?
Run `npx skills add EpicenterHQ/epicenter --skill query-layer -a claude-code`. Or copy the skill folder (.agents/skills/query-layer in EpicenterHQ/epicenter) into .claude/skills/query-layer in your project. Claude Code loads it when a task matches its description.
How do I install Query Layer in Codex?
Run `npx skills add EpicenterHQ/epicenter --skill query-layer -a codex`. Or copy the skill folder (.agents/skills/query-layer in EpicenterHQ/epicenter) into .agents/skills/query-layer in your project. Codex loads it when a task matches its description.
Can I use Query Layer 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 EpicenterHQ/epicenter --skill query-layer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/query-layer, .gemini/skills/query-layer, .github/skills/query-layer and .opencode/skills/query-layer in your project.
What does Query Layer need to run?
SKILL.md names no scripts, command-line tools or credentials: Query Layer is instructions for the agent only.
Does Query Layer access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Query Layer 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 Query Layer use?
Query Layer 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 Query Layer use?
About 2.5k tokens (SKILL.md is roughly 9.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.4k tokens, read only when the agent opens those files.
What are the alternatives to Query Layer?
Skills that share tags, products or a category with Query Layer: Frontend Guide (lightly-ai/lightly-studio, 896 stars), Tanstack Form (exceptionless/Exceptionless, 2.5k stars), Tanstack Query (bskimball/tanstack-hono, 119 stars) and Frontend Architecture (exceptionless/Exceptionless, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Query Layer?
EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,818 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 7, 2026.
Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.