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Agent skill

Stackblitz Rate Limits

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

Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support.

MITAuto-check passedBackend & APIs

Install Stackblitz Rate Limits

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

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

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace stackblitz-rate-limits --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-rate-limits .claude/skills/stackblitz-rate-limits && 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-rate-limits
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
501 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support.

  • Works in 6 steps: Define the critical journey and… → Inventory mounted bytes/files,… → Measure a cold run and a repeat run… → …
  • A StackBlitz experience is slow
  • 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 Rate Limits is an agent skill from jeremylongshore/tons-of-skills-marketplace. Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support. Use when a StackBlitz experience is slow, unstable, or being prepared for wider rollout. Trigger with "WebContainer limits", "StackBlitz capacity", or "WebContainer performance budget".

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 Rate limiting and Web performance. 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

  • A StackBlitz experience is slow
  • Being prepared for wider rollout
  • With WebContainer limits
  • StackBlitz capacity

Example prompts

  • “WebContainer limits”
  • “StackBlitz capacity”
  • “WebContainer performance budget”
  • “/stackblitz-rate-limits”

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. Define the critical journey and measurable startup, install, preview, memory-symptom, and recovery thresholds.
  2. Inventory mounted bytes/files, dependency count and lockfile, process count, preview count, and cleanup behavior.
  3. Measure a cold run and a repeat run across the supported browser/device matrix.
  4. Vary one dimension at a time using synthetic fixtures and record the first degraded or failed state.
  5. Apply the smallest optimization: reduce mounted inputs, pin/trim dependencies, reuse lifecycle ownership, defer embeds, or terminate…
  6. Re-measure, set an application-owned budget, and define a user-visible fallback before rollout.

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

    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 Rate Limits loads about 1.2k tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 95 tokens; SKILL.md has 501 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~95
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
~1.4k

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). 501 words, ~1,202 tokens.

Download SKILL.mdSave it as .claude/skills/stackblitz-rate-limits/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
stackblitz-rate-limits
description
Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support. Use when a StackBlitz experience is slow, unstable, or being prepared for wider rollout. Trigger with "WebContainer limits", "StackBlitz capacity", or "WebContainer performance budget".
allowed-tools
Read, Glob, Grep, WebFetch, Write, Edit
compatibility
Designed for Claude Code
argument-hint
[project-path] [journey]
version
1.7.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
tags
saas, stackblitz, performance, capacity
model
inherit
effort
medium

WebContainer Capacity and Constraints

Overview

This skill replaces unsupported universal quota tables with measured application budgets. WebContainer capacity depends on the browser, device, project, dependency graph, concurrent embeds, and hosted runtime; the output records local thresholds and graceful degradation rather than claiming a fixed vendor limit.

Prerequisites

  • A named user journey, supported browser/device matrix, and representative synthetic project
  • Existing performance or browser-test tooling, or permission to define a measurement plan
  • Product thresholds for startup, interaction, failure recovery, and fallback

Tool Discipline

Use Read, Glob, and Grep to inspect mounted inputs, lockfiles, process creation, embeds, cleanup, and existing performance budgets. Use WebFetch only for current official StackBlitz or WebContainers documentation. Use Write or Edit only for an approved measurement harness or bounded optimization.

Current Contract

  • Only one WebContainer may be booted concurrently on a page; additional experiences must share ownership or defer loading.
  • Multiple projects, processes, dependencies, and embeds consume browser memory; out-of-memory behavior is device- and browser-dependent.
  • Native addons do not run unless replaced by JavaScript or WebAssembly implementations.
  • Including the applicable lockfile can avoid fresh dependency resolution and improve repeatability.
  • Mount only required files and prefer one bulk mount() for initial hydration.
  • Use lazy or click-to-load embeds and a static fallback when the page contains several interactive examples.

Authentication

Capacity tests use synthetic public packages by default. Never copy private source, tokens, registry credentials, or customer dependency metadata into a benchmark artifact. Licensed enterprise behavior must be tested only in its authorized environment.

Workflow

  1. Define the critical journey and measurable startup, install, preview, memory-symptom, and recovery thresholds.
  2. Inventory mounted bytes/files, dependency count and lockfile, process count, preview count, and cleanup behavior.
  3. Measure a cold run and a repeat run across the supported browser/device matrix.
  4. Vary one dimension at a time using synthetic fixtures and record the first degraded or failed state.
  5. Apply the smallest optimization: reduce mounted inputs, pin/trim dependencies, reuse lifecycle ownership, defer embeds, or terminate unused processes.
  6. Re-measure, set an application-owned budget, and define a user-visible fallback before rollout.
Show full SKILL.md (163 more words)Show less

Approval Boundaries

Do not run load experiments against customer projects, weaken browser security, remove required functionality, or change production loading behavior without explicit scope. Show measured impact and rollback before rollout.

Output

Return the journey and matrix, input dimensions, measurements, application budgets, bottleneck evidence, optimization, before/after result, graceful fallback, rollback, and limits not established by evidence.

Error Handling

ConditionResponse
Browser reports out of memoryReduce concurrent projects/processes and mounted/dependency size; preserve fallback.
Install time is unstablePin inputs, include the lockfile, and separate network variance from runtime work.
A native addon failsSelect a JavaScript/WebAssembly alternative or declare the project incompatible.
No vendor quota is documentedPublish a measured application budget, not an invented universal number.

Examples

For a documentation page with six embeds, measure cold and click-to-load behavior, keep one active runtime at a time, define a static fallback, and record browser/device thresholds without claiming a fixed memory limit.

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-rate-limits of jeremylongshore/tons-of-skills-marketplace.

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

Open the folder on GitHubat commit 23ea8d4

Compare with similar skills

Stackblitz Rate Limits 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 Rate Limits compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Stackblitz Rate Limits this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
Cloudflare Workers Performancesecondsky/claude-skills227—~1.6kAutomated safety check: PassMIT
Scaling Load Assumptionshashgraph-online/awesome-codex-plugins1.2k—~2.3kAutomated safety check: PassApache-2.0
Quota Axilayer5io/sistent138—~956Automated safety check: PassApache-2.0
Resiliencecodewithmukesh/dotnet-claude-kit7511 repos~3.2kAutomated safety check: PassMIT
Handle Issuesaaddrick/claude-pipeline130—~4kAutomated safety check: PassMIT

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Categories

Questions about Stackblitz Rate Limits

What does Stackblitz Rate Limits do?

Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support. Stackblitz Rate Limits is an agent skill from jeremylongshore/tons-of-skills-marketplace. Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support.

When should I use Stackblitz Rate Limits?

Stackblitz Rate Limits fits situations like: A StackBlitz experience is slow; being prepared for wider rollout; with WebContainer limits; stackBlitz capacity.

How do I install Stackblitz Rate Limits in Claude Code?

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

How do I install Stackblitz Rate Limits in Codex?

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

Can I use Stackblitz Rate Limits 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-rate-limits -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-rate-limits, .gemini/skills/stackblitz-rate-limits, .github/skills/stackblitz-rate-limits and .opencode/skills/stackblitz-rate-limits in your project.

What does Stackblitz Rate Limits need to run?

SKILL.md names no scripts, command-line tools or credentials: Stackblitz Rate Limits 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 Rate Limits access the network?

SKILL.md names 1 domain. As links in the text: webcontainers.io. This is read from the text; nothing was executed.

Is Stackblitz Rate Limits 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 Rate Limits use?

Stackblitz Rate Limits 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 Rate Limits use?

About 1.2k tokens (SKILL.md is roughly 4.8k 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 248 tokens, read only when the agent opens those files.

What are the alternatives to Stackblitz Rate Limits?

Skills that share tags, products or a category with Stackblitz Rate Limits: Cloudflare Workers Performance (secondsky/claude-skills, 227 stars), Scaling Load Assumptions (hashgraph-online/awesome-codex-plugins, 1.2k stars), Quota Axi (layer5io/sistent, 138 stars) and Resilience (codewithmukesh/dotnet-claude-kit, 751 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Stackblitz Rate Limits?

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.