Add Addons Existing App

OrganizationPopular

TanStack

add-addons-existing-app

Apply integrations to existing projects with tanstack add, including add-on id resolution, dependency chains, option prompts, and .cta.json project metadata preconditions.

Overview

Publisher	TanStack
Repository	`cli`
Skill name	`add-addons-existing-app`
Stars	1.3K
Forks	184
Bundled files	Instructions only
License	MIT
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by TanStack on GitHub. Read the source before you install it.

Installation

Install the Add Addons Existing App AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/TanStack/cli.git /tmp/cli
mkdir -p .claude/skills
cp -r /tmp/cli/packages/cli/skills/add-addons-existing-app .claude/skills/add-addons-existing-app

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Add Addons Existing App in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Add Addons Existing App on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Add Addons Existing App is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Add Add-ons To Existing App

Use this skill when the project already exists and you need to layer add-ons safely without breaking dependency or metadata assumptions.

Setup

bash
npx @tanstack/cli add clerk drizzle

Core Patterns

Add multiple integrations in one pass

bash
npx @tanstack/cli add tanstack-query drizzle

Resolve candidate ids before applying

bash
npx @tanstack/cli create --list-add-ons --json

Validate optionized add-ons before install

bash
npx @tanstack/cli create --addon-details prisma --json

Common Mistakes

CRITICAL Run tanstack add without .cta.json

Wrong:

bash
npx @tanstack/cli add clerk

Correct:

bash
# Run in a project scaffolded by TanStack CLI (contains .cta.json), then:
npx @tanstack/cli add clerk

Add flows depend on persisted scaffold metadata, so commands can fail or apply incomplete config when .cta.json is missing.

Source: packages/create/src/custom-add-ons/shared.ts:158

HIGH Use invalid add-on id

Wrong:

bash
npx @tanstack/cli add drizle

Correct:

bash
npx @tanstack/cli add drizzle

Unknown ids stop resolution and force manual correction before any add-on work proceeds.

Source: packages/create/src/add-ons.ts:44

HIGH Ignore add-on dependency requirements

Wrong:

bash
npx @tanstack/cli add custom-addon-with-missing-deps

Correct:

bash
npx @tanstack/cli add required-dependency custom-addon-with-missing-deps

Add-ons with dependsOn can fail during finalization if required dependencies are not present.

Source: packages/create/src/add-ons.ts:48

MEDIUM Assume old Windows path bug still present

Wrong:

bash
# Avoid tanstack add on Windows and patch manually

Correct:

bash
npx @tanstack/cli add clerk

Avoiding supported workflows based on historical bug reports causes unnecessary manual drift. Fixed in newer versions, but agents trained on older threads may still avoid this path.

Source: https://github.com/TanStack/cli/issues/329

HIGH Tension: Backwards support vs deterministic automation

This domain's patterns conflict with maintain-custom-addons-dev-watch. Automation that assumes universal add flows tends to fail because legacy compatibility still relies on hidden scaffold metadata.

See also: maintain-custom-addons-dev-watch/SKILL.md § Common Mistakes

Frequently asked questions

What does the Add Addons Existing App AI skill do?

Apply integrations to existing projects with tanstack add, including add-on id resolution, dependency chains, option prompts, and .cta.json project metadata preconditions.

Why use Add Addons Existing App on TypingMind?

Because you install it once and use it with any model. Add Addons Existing App is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Add Addons Existing App in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/TanStack/cli/tree/main/packages/cli/skills/add-addons-existing-app. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Add Addons Existing App?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Add Addons Existing App?

As many as you like. As long as a model supports skills, you can use Add Addons Existing App with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Add Addons Existing App AI skill free?

Yes. It is published on GitHub by TanStack under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Add Add-ons To Existing App

Setup

Core Patterns

Add multiple integrations in one pass

Resolve candidate ids before applying

Validate optionized add-ons before install

Common Mistakes

CRITICAL Run tanstack add without .cta.json

HIGH Use invalid add-on id

HIGH Ignore add-on dependency requirements

MEDIUM Assume old Windows path bug still present

HIGH Tension: Backwards support vs deterministic automation

Frequently asked questions

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