> ## Documentation Index
> Fetch the complete documentation index at: https://developers.tassyir.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Claude Code plugin

> Give Claude Code the Tassyir app contract and the developer MCP server with one plugin.

The `tassyir` plugin gives Claude Code what it needs to build a Tassyir app:

* the **developer MCP server**, [`@tassyir/dev-mcp`](/packages/dev-mcp): it searches and reads these guides, looks up any Admin API operation and webhook body, validates `tassyir.app.toml` with the API's own validator, starts a new app from the starter, and sends test webhooks and creates dev stores with your `tassyir login`;
* the **`tassyir-app` skill**: the app contract (manifest, scopes, tokens, webhooks, Admin API, App Bridge, dev stores), the same file [`create-tassyir-app`](/packages/create-tassyir-app) writes into every new project.

## Install

In Claude Code, add Tassyir's plugin marketplace, then install the plugin:

```text theme={null}
/plugin marketplace add tassyir/apps-sdk
/plugin install tassyir@tassyir
```

From a terminal, the same is:

```bash theme={null}
claude plugin marketplace add tassyir/apps-sdk
claude plugin install tassyir@tassyir
```

The marketplace is the [`tassyir/apps-sdk`](https://github.com/tassyir/apps-sdk) repository. The plugin runs the `@tassyir/dev-mcp` release it names, with `npx`, so you need Node 22.18 or later.

## Update

For a newer release later:

```bash theme={null}
claude plugin marketplace update tassyir
claude plugin update tassyir@tassyir
```

## Without the plugin

The server alone works in any MCP client. In Claude Code:

```bash theme={null}
claude mcp add tassyir -- npx -y @tassyir/dev-mcp
```

The tools that act on your Tassyir account use the sign-in of the [`tassyir` CLI](/packages/cli). Sign in once, in a terminal:

```bash theme={null}
npx tassyir login
```

Every tool, its input and its answers: [`@tassyir/dev-mcp`](/packages/dev-mcp).


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