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Agent skill

Stackblitz Install Auth

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path.

MITAuto-check passedBackend & APIs

Install Stackblitz Install Auth

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill stackblitz-install-auth -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace stackblitz-install-auth --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/stackblitz-install-auth .claude/skills/stackblitz-install-auth && rm -rf skills-src

Use ~/.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/

Facts

Skill name
stackblitz-install-auth
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
538 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path.

  • Works in 6 steps: Inspect the framework, package manager,… → Choose the minimum package surface and… → Decide whether the integration needs a… → …
  • Adding StackBlitz to an existing web application
  • SKILL.md covers Overview, Prerequisites, Tool Discipline and Current Contract, plus 7 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Stackblitz Install Auth is an agent skill from jeremylongshore/tons-of-skills-marketplace. Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path. Use when adding StackBlitz to an existing web application or reviewing its startup contract. Trigger with "install StackBlitz", "set up WebContainers", or "configure WebContainer auth".

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, including reference files (for example `references/official-docs.md`). Compatibility notes: Designed for Claude Code

It sits in Backend & APIs, covering Third-party API integration and Authentication. It works with JavaScript. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Adding StackBlitz to an existing web application
  • Reviewing its startup contract
  • With install StackBlitz
  • Set up WebContainers

Example prompts

  • “install StackBlitz”
  • “set up WebContainers”
  • “configure WebContainer auth”
  • “/stackblitz-install-auth”

Requirements

  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Glob, Grep, WebFetch, Write, Edit

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Inspect the framework, package manager, lockfile, client/server boundary, CSP, and current response-header configuration.
  2. Choose the minimum package surface and record the installed or proposed pinned version.
  3. Decide whether the integration needs a commercial API key, organization auth, neither, or both.
  4. Configure consistent COOP/COEP headers and the matching boot option; verify the final HTML response, including cached responses.
  5. Add one startup module that orders API-key configuration, auth initialization, and the single boot call correctly.
  6. Validate in a supported desktop browser over the same origin and headers intended for deployment.

What it can do on your machine

Read from SKILL.md and the folder at commit 23ea8d4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • WebFetch
    • Write
    • Edit

    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

    Links to these hosts (documentation or services it may open):

    • webcontainers.io
    • developer.stackblitz.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.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Stackblitz Install Auth loads about 1.2k tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 98 tokens; SKILL.md has 538 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~98
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.5k

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 jeremylongshore/tons-of-skills-marketplace at commit 23ea8d4, republished under its MIT licence (© jeremylongshore). 538 words, ~1,249 tokens.

Download SKILL.mdSave it as .claude/skills/stackblitz-install-auth/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
stackblitz-install-auth
description
Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path. Use when adding StackBlitz to an existing web application or reviewing its startup contract. Trigger with "install StackBlitz", "set up WebContainers", or "configure WebContainer auth".
allowed-tools
Read, Glob, Grep, WebFetch, Write, Edit
compatibility
Designed for Claude Code
argument-hint
[project-path] [webcontainer|embed]
version
1.7.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
tags
saas, stackblitz, webcontainers, setup
model
inherit
effort
medium

StackBlitz Integration Preflight

Overview

This skill produces a repo-grounded installation and startup plan for either a custom WebContainer application or a StackBlitz SDK embed. It separates ordinary browser startup from commercial API-key configuration and organization-scoped private-package authentication.

Prerequisites

  • A named browser application and permission to inspect its package and hosting configuration
  • A decision between @webcontainer/api and @stackblitz/sdk, or evidence that both are needed
  • A licensing decision for production commercial use before release

Tool Discipline

Use Read, Glob, and Grep to inspect package manifests, lockfiles, browser entrypoints, headers, and existing secret bindings. Use WebFetch only for current official StackBlitz or WebContainers documentation. Use Write or Edit only after the evidence pass, and never place API keys or OAuth material in source files.

Current Contract

  • Pin the package version selected by the repository's dependency policy; do not install an unreviewed moving tag.
  • Call configureAPIKey before WebContainer.boot() when a commercial license supplies an API key.
  • Call auth.init before boot when organization users need private-package access; the user must be logged in, belong to the issuing organization, and authorize the site.
  • Match the Cross-Origin-Embedder-Policy response header to the coep boot option. Use HTTPS outside localhost.
  • A StackBlitz SDK embed is a separate surface and does not require booting a custom WebContainer in the host application.

Authentication

Public prototypes may not need user authentication, but production commercial use requires a licensing review. Treat the WebContainer API key as a secret runtime binding. Treat the auth client ID and scope as configuration, initialize auth during page loading, and handle need-auth, authorized, and auth-failed explicitly. Never infer that ordinary StackBlitz login grants access to private packages.

Workflow

  1. Inspect the framework, package manager, lockfile, client/server boundary, CSP, and current response-header configuration.
  2. Choose the minimum package surface and record the installed or proposed pinned version.
  3. Decide whether the integration needs a commercial API key, organization auth, neither, or both.
  4. Configure consistent COOP/COEP headers and the matching boot option; verify the final HTML response, including cached responses.
  5. Add one startup module that orders API-key configuration, auth initialization, and the single boot call correctly.
  6. Validate in a supported desktop browser over the same origin and headers intended for deployment.
Show full SKILL.md (174 more words)Show less

Approval Boundaries

Default to inspection and a proposed patch. Require explicit authorization before changing production headers, CSP, identity-provider settings, licensed API-key bindings, or deployment configuration. Never create, rotate, expose, or revoke a credential without a separately authorized operational step.

Output

Return the selected integration mode, package/version evidence, licensing and auth decision, header/boot contract, changed or proposed files, verification results, rollout plan, rollback, and unresolved browser or policy risks.

Error Handling

ConditionResponse
API key configured after bootStop and move configuration before the first boot call.
Auth reports need-authPresent the user-authorized flow; do not loop or fabricate authorization.
crossOriginIsolated is falseInspect actual response headers and cache behavior before changing code.
Integration mode is unclearCompare custom runtime requirements with embed-only requirements before installing both SDKs.

Examples

Given an existing Vite app, identify its lockfile and hosting headers, select a pinned WebContainer API version, document whether commercial licensing applies, and propose a single ordered startup module without reading any secret value.

Resources

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/.curated/stackblitz-install-auth of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/official-docs.md

Open the folder on GitHubat commit 23ea8d4

Compare with similar skills

Stackblitz Install Auth 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.

Stackblitz Install Auth compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Stackblitz Install Auth this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
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Gemini Live API Devgoogle-gemini/gemini-skills4.3k—~4.6kAutomated safety check: PassApache-2.0
Passport Developmenttrypostit/trypost678—~1.9kAutomated safety check: PassMIT
Frappe Core APIImpertio-Studio/Frappe_Claude_Skill_Package1871 repos~3.2kAutomated safety check: PassMIT
Soundcloud API Integrationsoundcloud/api258—~787Automated safety check: PassNone

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Works with

Categories

Questions about Stackblitz Install Auth

What does Stackblitz Install Auth do?

Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path. Stackblitz Install Auth is an agent skill from jeremylongshore/tons-of-skills-marketplace. Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path.

When should I use Stackblitz Install Auth?

Stackblitz Install Auth fits situations like: adding StackBlitz to an existing web application; reviewing its startup contract; with install StackBlitz; set up WebContainers.

How do I install Stackblitz Install Auth in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill stackblitz-install-auth -a claude-code`. Or copy the skill folder (skills/.curated/stackblitz-install-auth in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/stackblitz-install-auth in your project. Claude Code loads it when a task matches its description.

How do I install Stackblitz Install Auth in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill stackblitz-install-auth -a codex`. Or copy the skill folder (skills/.curated/stackblitz-install-auth in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/stackblitz-install-auth in your project. Codex loads it when a task matches its description.

Can I use Stackblitz Install Auth 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 jeremylongshore/tons-of-skills-marketplace --skill stackblitz-install-auth -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/stackblitz-install-auth, .gemini/skills/stackblitz-install-auth, .github/skills/stackblitz-install-auth and .opencode/skills/stackblitz-install-auth in your project.

What does Stackblitz Install Auth need to run?

SKILL.md names no scripts, command-line tools or credentials: Stackblitz Install Auth is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, WebFetch, Write, Edit. Compatibility (from SKILL.md): Designed for Claude Code.

Does Stackblitz Install Auth access the network?

SKILL.md names 2 domains. As links in the text: webcontainers.io and developer.stackblitz.com. This is read from the text; nothing was executed.

Is Stackblitz Install Auth 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 Stackblitz Install Auth use?

Stackblitz Install Auth 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 Stackblitz Install Auth use?

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. Its references folder adds about 273 tokens, read only when the agent opens those files.

What are the alternatives to Stackblitz Install Auth?

Skills that share tags, products or a category with Stackblitz Install Auth: Shopify API (Microck/ordinary-claude-skills, 403 stars), Gemini Live API Dev (google-gemini/gemini-skills, 4.3k stars), Passport Development (trypostit/trypost, 678 stars) and Frappe Core API (Impertio-Studio/Frappe_Claude_Skill_Package, 187 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Stackblitz Install Auth?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,821 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 8, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.