Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests.
Install Libretto Readonly
$ npx skills add cashew-labs/libretto --skill libretto-readonly -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cashew-labs/libretto libretto-readonly --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/cashew-labs/libretto.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/libretto-readonly .claude/skills/libretto-readonly && 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 "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .claude/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonlyType 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 cashew-labs/libretto --skill libretto-readonly -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cashew-labs/libretto libretto-readonly --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/libretto-readonly .agents/skills/libretto-readonly && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .agents/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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 cashew-labs/libretto --skill libretto-readonly -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cashew-labs/libretto libretto-readonly --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/libretto-readonly .cursor/skills/libretto-readonly && 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 "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .cursor/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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/cashew-labs/libretto.git --path .agents/skills/libretto-readonly--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 cashew-labs/libretto --skill libretto-readonly -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cashew-labs/libretto libretto-readonly --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/libretto-readonly .gemini/skills/libretto-readonly && 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 "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .gemini/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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 cashew-labs/libretto libretto-readonlyInstalls 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 cashew-labs/libretto --skill libretto-readonly -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/libretto-readonly .github/skills/libretto-readonly && 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 "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .github/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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 cashew-labs/libretto --skill libretto-readonly -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cashew-labs/libretto libretto-readonly --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/libretto-readonly .opencode/skills/libretto-readonly && 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 "libretto-readonly" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/libretto-readonly into .opencode/skills/libretto-readonly/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "libretto-readonly", 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
libretto-readonly- GitHub stars
- 904
- Token cost
- ~1.1k tokens
- SKILL.md length
- 441 words
- Files
- 1
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- MIT
At a glance
Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests.
- Development work in your project
- SKILL.md covers How Libretto Read-Only Works, Working Rules and Commands
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Libretto Readonly is an agent skill from cashew-labs/libretto. Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests.
Its SKILL.md is about 1.1k 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 Development. The repository describes itself as: The AI toolkit for building reliable browser automations. The licence is MIT.
When your agent uses it
- Development work in your project
Example prompts
- “/libretto-readonly”
What it can do on your machine
Read from SKILL.md and the folder at commit 41ab782. 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
Libretto Readonly loads about 1.1k tokens when it runs. Until then it costs about 34 tokens; SKILL.md has 441 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 cashew-labs/libretto at commit 41ab782, republished under its MIT licence (© cashew-labs). 441 words, ~1,083 tokens.
Download SKILL.mdSave it as
.claude/skills/libretto-readonly/SKILL.md (or your agent's skills folder).- name
- libretto-readonly
- description
- Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests.
- license
- MIT
- metadata.author
- saffron-health
- metadata.version
- 0.6.45
How Libretto Read-Only Works
- Use this skill when the browser session must stay strictly read-only.
- Libretto stores read-only vs write-access on the session itself.
- The primary inspection tools are
snapshotandreadonly-exec. readonly-execreuses Libretto's normal execution pipeline, but it only exposes read-only helpers and denies mutating Playwright methods.- Only a user can change the session mode for an existing session. Never change a session's mode on your own — the user must change it themselves manually.
Working Rules
- Announce which session you are using and what page you are inspecting.
- Do not use
exec,run, or any direct Playwright action that could change browser or application state. - Do not click, type, submit forms, navigate, upload files, dispatch DOM events, or send non-GET requests.
- Prefer
snapshotfirst when the visible page state is unclear. - Use
readonly-execfor focused inspection: titles, HTML, locator text, counts, visibility checks, and GET requests. - Keep snippets small and purpose-built. Do not run multiple
readonly-execcommands at the same time. - Close disposable sessions before your final response once inspection is complete. Open browsers keep consuming local or hosted resources.
- End with diagnosis and handoff guidance, not an attempted in-browser repair.
Commands
connect
- Use
connectto attach to an existing CDP endpoint for a preserved browser session. - Use
--read-onlywhen creating the Libretto session handle for a preserved browser session. - Libretto read-only mode is enforced through Libretto commands; direct CDP clients that skip Libretto are outside this boundary.
libretto connect http://127.0.0.1:9222 --read-only --session failed-job-debugpages
- Use
pageswhen a popup, new tab, or second page exists. - If
readonly-execorsnapshotcomplains about multiple pages, list ids first and then pass--page.
libretto pages --session failed-job-debugShow full SKILL.md (174 more words)Show less
snapshot
- Use
snapshotas the first high-level observation tool. - Run
snapshot <ref>to inspect a subtree from the latest full snapshot.
readonly-exec
- Use
readonly-execfor narrow inspection code only. - Denied operations fail with
ReadonlyExecDenied: ....
Helpers
page— a read-only PlaywrightPageproxy. Standard Playwright read methods work normally (url(),title(),content(),frames(),getByRole(),locator(),textContent(),isVisible(),count(),scrollIntoViewIfNeeded(), etc.).frames()returns read-onlyFrameproxies, including fromchildFrames()andparentFrame(). Anything that mutates a page or frame (click,fill,goto,evaluate,keyboard,mouse) is blocked.state— the current Libretto session state object.get(url, options?)— HTTP client restricted to GET and HEAD requests. Replacesfetch, which is blocked in readonly mode. Any request with a body or a non-GET/HEAD method throwsReadonlyExecDenied.scrollBy(deltaX, deltaY)— scroll the viewport by pixel offset. Use this to inspect content below the fold without targeting a specific element.
Standard JS globals console, URL, Buffer, setTimeout, and setInterval are also available.
Examples
libretto readonly-exec "return page.url()" --session failed-job-debug
libretto readonly-exec "return await page.getByRole('heading').first().textContent()" --session failed-job-debug
libretto readonly-exec "return await page.frames()[1]?.getByRole('heading').textContent()" --session failed-job-debug
# HTTP GET inspection
echo "const r = await get('https://api.example.com/status'); return await r.json()" \
| libretto readonly-exec - --session failed-job-debug
# Scroll down to inspect below-the-fold content
libretto readonly-exec "await scrollBy(0, 500)" --session failed-job-debugclose
- Use
closewhen the inspection session is no longer needed, unless the user explicitly asks to keep the browser open.
libretto close --session failed-job-debug© cashew-labs, MIT. 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 .agents/skills/libretto-readonly of cashew-labs/libretto.
Open the folder on GitHubat commit 41ab782
Compare with similar skills
Libretto Readonly 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 |
|---|---|---|---|---|---|---|
| Libretto Readonly this skillcashew-labs/libretto | 904 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 58 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 297k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
Similar skills
- Official
Finishing a Development Branch
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
Typescript Advanced Types
rolling-scopes/rsschool-app
Master TypeScript's advanced type system including generics, conditional types, mapped types, template literals, and utility types for building type-safe applications.
PR Babysitter
openinterpreter/openinterpreter
Watches an open GitHub pull request until it merges, handling review comments, diagnosing CI failures and retrying flaky checks along the way.
Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
Greploop
onyx-dot-app/onyx
Iteratively improves a PR (GitHub), MR (GitLab), or shelved changelist (Perforce) until Greptile gives it a 5/5 confidence score with zero unresolved comments.
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Related
Categories
Questions about Libretto Readonly
What does Libretto Readonly do?
Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests. Libretto Readonly is an agent skill from cashew-labs/libretto. Read-only Libretto workflow for diagnosing live browser state without clicks, typing, navigation, or mutation requests.
When should I use Libretto Readonly?
Libretto Readonly fits situations like: development work in your project.
How do I install Libretto Readonly in Claude Code?
Run `npx skills add cashew-labs/libretto --skill libretto-readonly -a claude-code`. Or copy the skill folder (.agents/skills/libretto-readonly in cashew-labs/libretto) into .claude/skills/libretto-readonly in your project. Claude Code loads it when a task matches its description.
How do I install Libretto Readonly in Codex?
Run `npx skills add cashew-labs/libretto --skill libretto-readonly -a codex`. Or copy the skill folder (.agents/skills/libretto-readonly in cashew-labs/libretto) into .agents/skills/libretto-readonly in your project. Codex loads it when a task matches its description.
Can I use Libretto Readonly 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 cashew-labs/libretto --skill libretto-readonly -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/libretto-readonly, .gemini/skills/libretto-readonly, .github/skills/libretto-readonly and .opencode/skills/libretto-readonly in your project.
What does Libretto Readonly need to run?
SKILL.md names no scripts, command-line tools or credentials: Libretto Readonly is instructions for the agent only.
Does Libretto Readonly 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 Libretto Readonly 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 Libretto Readonly use?
Libretto Readonly is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Libretto Readonly use?
About 1.1k tokens (SKILL.md is roughly 4.3k 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 Libretto Readonly?
Skills that share tags, products or a category with Libretto Readonly: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Libretto Readonly?
cashew-labs (a GitHub organization) maintains it in cashew-labs/libretto, which has 904 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on August 21, 2026.
Source: cashew-labs/libretto on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.