Langfuse Previews
langfuse/langfuse
Use Langfuse's disposable per-PR previews at pr-N.preview.langfuse.com (synthetic data only).
Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost.
Apache-2.0Auto-check passed
Install Cloud Preview
$ npx skills add davidondrej/cloudroom-core --skill cloud-preview -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install davidondrej/cloudroom-core cloud-preview --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/davidondrej/cloudroom-core.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/preview/cloud-preview .claude/skills/cloud-preview && 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 "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .claude/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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/davidondrej/cloudroom-core/tree/main/src/preview/cloud-previewType 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 davidondrej/cloudroom-core --skill cloud-preview -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install davidondrej/cloudroom-core cloud-preview --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidondrej/cloudroom-core.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/preview/cloud-preview .agents/skills/cloud-preview && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .agents/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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 davidondrej/cloudroom-core --skill cloud-preview -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install davidondrej/cloudroom-core cloud-preview --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidondrej/cloudroom-core.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/preview/cloud-preview .cursor/skills/cloud-preview && 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 "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .cursor/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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/davidondrej/cloudroom-core.git --path src/preview/cloud-preview--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 davidondrej/cloudroom-core --skill cloud-preview -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install davidondrej/cloudroom-core cloud-preview --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidondrej/cloudroom-core.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/preview/cloud-preview .gemini/skills/cloud-preview && 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 "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .gemini/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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 davidondrej/cloudroom-core cloud-previewInstalls 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 davidondrej/cloudroom-core --skill cloud-preview -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/davidondrej/cloudroom-core.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/preview/cloud-preview .github/skills/cloud-preview && 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 "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .github/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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 davidondrej/cloudroom-core --skill cloud-preview -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install davidondrej/cloudroom-core cloud-preview --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidondrej/cloudroom-core.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/preview/cloud-preview .opencode/skills/cloud-preview && 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 "cloud-preview" agent skill from https://github.com/davidondrej/cloudroom-core/tree/main/src/preview/cloud-preview into .opencode/skills/cloud-preview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cloud-preview", 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
cloud-preview- GitHub stars
- 276
- Token cost
- ~282 tokens
- SKILL.md length
- 149 words
- Files
- 1
- Skills in repo
- 5
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost.
- Works in 5 steps: Start the HTTP development server on… → Run cloudroom preview PORT with its… → Only when the JSON says state: ready,… → …
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cloud Preview is an agent skill from davidondrej/cloudroom-core. Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost. Use after starting a development server or when asked to show a browser preview.
Its SKILL.md is about 280 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: Open-source, self-hostable Rust runtime that runs Claude Code, Codex, and Pi in the cloud. The licence is Apache-2.0.
Example prompts
- “/cloud-preview”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Start the HTTP development server on IPv4 loopback (127.0.0.1) as the normal agent user. Keep its process running. Do not install packages…
- Run cloudroom preview PORT with its actual port.
- Only when the JSON says state: ready, post the returned url as a Markdown link. Do not guess a localhost port, open the browser…
- If pending, explain that the paired Mac must be connected; use cloudroom preview status PORT to check again. A failed or pending preview…
- cloudroom preview close PORT closes forwarding, not the app. Stop the app separately only when requested.
What it can do on your machine
Read from SKILL.md and the folder at commit 9603ed1. 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
Cloud Preview loads about 282 tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 149 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 davidondrej/cloudroom-core at commit 9603ed1, republished under its Apache-2.0 licence (© davidondrej). 149 words, ~282 tokens.
Download SKILL.mdSave it as
.claude/skills/cloud-preview/SKILL.md (or your agent's skills folder).- name
- cloud-preview
- description
- Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost. Use after starting a development server or when asked to show a browser preview.
Cloud preview
- Start the HTTP development server on IPv4 loopback (
127.0.0.1) as the normal agent user. Keep its process running. Do not install packages just to expose it. - Run
cloudroom preview PORTwith its actual port. - Only when the JSON says
state: ready, post the returnedurlas a Markdown link. Do not guess a localhost port, open the browser automatically, or use BB Connect or other public hosting. - If pending, explain that the paired Mac must be connected; use
cloudroom preview status PORTto check again. A failed or pending preview does not stop cloud work. cloudroom preview close PORTcloses forwarding, not the app. Stop the app separately only when requested.
Local threads use their ordinary localhost server directly. Do not change server security settings to allow all hosts/origins. Never ask for or print SSH private keys, core tokens, or hosting credentials.
© davidondrej, 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
Files
Just SKILL.md in src/preview/cloud-preview of davidondrej/cloudroom-core.
Open the folder on GitHubat commit 9603ed1
Compare with similar skills
Cloud Preview 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 |
|---|---|---|---|---|---|---|
| Cloud Preview this skilldavidondrej/cloudroom-core | 276 | — | ~282 | Automated safety check: Pass | Apache-2.0 | |
| Langfuse Previewslangfuse/langfuse | 36k | — | ~2.8k | Automated safety check: Notes | Custom licence | |
| Upload Element Previewsremotion-dev/remotion | 63k | — | ~265 | Automated safety check: Pass | Custom licence | |
| Turn This Into A Threadsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Windmill Dev Page Previewwindmill-labs/windmill | 18k | — | ~1.8k | Automated safety check: Pass | Custom licence | |
| Docs Learn PR Previewnetdata/netdata | 81k | — | ~2k | Automated safety check: Pass | GPL-3.0 |
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Upload Element Previews
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Upload a Remotion Element's preview assets to remotion.media and replace local preview URLs.
Turn This Into A Thread
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Turn a long idea, transcript, article or draft into a Twitter/X thread where every tweet stands alone.
Windmill Dev Page Preview
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Opens the Windmill dev page to preview a flow, script or app, choosing between proxy and direct mode and deciding whether the agent or the runtime starts the wmill dev server.
Docs Learn PR Preview
netdata/netdata
Use only when the user explicitly asks to build, run, preview, inspect, or validate learn.netdata.cloud locally using the contents of a PR or documentation branch before merge.
Preview
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Run this git worktree's code in its own local server at https://slot-local.blot (slots a-e) so the operator can see and click through it while the main stack keeps running.
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Questions about Cloud Preview
What does Cloud Preview do?
Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost. Cloud Preview is an agent skill from davidondrej/cloudroom-core. Show a web app running in a Cloudroom cloud thread through the user’s laptop localhost.
How do I install Cloud Preview in Claude Code?
Run `npx skills add davidondrej/cloudroom-core --skill cloud-preview -a claude-code`. Or copy the skill folder (src/preview/cloud-preview in davidondrej/cloudroom-core) into .claude/skills/cloud-preview in your project. Claude Code loads it when a task matches its description.
How do I install Cloud Preview in Codex?
Run `npx skills add davidondrej/cloudroom-core --skill cloud-preview -a codex`. Or copy the skill folder (src/preview/cloud-preview in davidondrej/cloudroom-core) into .agents/skills/cloud-preview in your project. Codex loads it when a task matches its description.
Can I use Cloud Preview 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 davidondrej/cloudroom-core --skill cloud-preview -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cloud-preview, .gemini/skills/cloud-preview, .github/skills/cloud-preview and .opencode/skills/cloud-preview in your project.
What does Cloud Preview need to run?
SKILL.md names no scripts, command-line tools or credentials: Cloud Preview is instructions for the agent only.
Does Cloud Preview 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 Cloud Preview 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 Cloud Preview use?
Cloud Preview 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.
How many tokens does Cloud Preview use?
About 282 tokens (SKILL.md is roughly 1.1k 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 Cloud Preview?
Skills that share tags, products or a category with Cloud Preview: Langfuse Previews (langfuse/langfuse, 36k stars), Upload Element Previews (remotion-dev/remotion, 63k stars), Turn This Into A Thread (sickn33/agentic-awesome-skills, 47k stars) and Windmill Dev Page Preview (windmill-labs/windmill, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cloud Preview?
davidondrej (a GitHub user) maintains it in davidondrej/cloudroom-core, which has 276 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 8, 2026.
Source: davidondrej/cloudroom-core on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.