new-sdk-app

new-sdk-app is a command for Claude Code from anthropics/claude-plugins-official. It costs 9 tokens per session (1,782 once invoked), scanned A, original, Apache-2.0.

A setup command for creating a new application with the Claude Agent SDK, a software library for building apps that use Claude as an agent.

In plain words
What is it for?
Use it to create a TypeScript or Python Agent SDK application and gather the requirements needed to configure it.
Why use it?
It guides the initial project setup and checks the relevant official documentation, reducing the chance of starting with outdated package information or unsuitable configuration.

Command for Claude Code ✓ vendor

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions subagents.

Part of the agent-sdk-dev plugin — 1 command, 2 agents shipped together

Good fit Use it to create a TypeScript or Python Agent SDK application and gather the requirements needed to configure it.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/anthropics/claude-plugins-official/new-sdk-app
About the project

Claude Code Plugins Directory is a marketplace containing plugins for Claude Code, including tools, commands, skills, agents, hooks, and model context servers. Claude Code users browse it to install Anthropic-maintained or approved third-party extensions.

anthropics/claude-plugins-official · 35,987 stars · on GitHub · code.claude.com

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/anthropics/claude-plugins-official

Made for: Claude Code.

Or install agent-sdk-dev, the plugin that ships this one along with the rest of its 1 command, 2 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for new-sdk-app

README.md
[![agentmods](https://agentmods.dev/badge/commands/anthropics/claude-plugins-official/new-sdk-app.svg)](https://agentmods.dev/commands/anthropics/claude-plugins-official/new-sdk-app)
Your own site
<a href="https://agentmods.dev/commands/anthropics/claude-plugins-official/new-sdk-app"><img src="https://agentmods.dev/badge/commands/anthropics/claude-plugins-official/new-sdk-app.svg" alt="Measured on agentmods" height="20"></a>
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,782 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00009 $0.01782
Opus 5 $0.00005 $0.00891
Sonnet 5 $0.00002 $0.00356
Haiku 4.5 $0.00001 $0.00178

Measured 8d ago against content hash d273539c037e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

new-sdk-app scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

plugins/agent-sdk-dev/commands/new-sdk-app.md · 177 lines

How it starts

The opening of the file, as written. The whole thing — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are tasked with helping the user create a new Claude Agent SDK application. Follow these steps carefully:

Reference Documentation

Before starting, review the official documentation to ensure you provide accurate and up-to-date guidance. Use WebFetch to read these pages:

  1. Start with the overview: https://docs.claude.com/en/api/agent-sdk/overview
  2. Based on the user's language choice, read the appropriate SDK reference:
  3. Read relevant guides mentioned in the overview such as:
    • Streaming vs Single Mode
    • Permissions
    • Custom Tools
    • MCP integration
    • Subagents
    • Sessions
    • Any other relevant guides based on the user's needs

IMPORTANT: Always check for and use the latest versions of packages. Use WebSearch or WebFetch to verify current versions before installation.

Gather Requirements

IMPORTANT: Ask these questions one at a time. Wait for the user's response before asking the next question. This makes it easier for the user to respond.

Ask the questions in this order (skip any that the user has already provided via arguments):

  1. Language (ask first): "Would you like to use TypeScript or Python?"

    • Wait for response before continuing
  2. Project name (ask second): "What would you like to name your project?"

    • If $ARGUMENTS is provided, use that as the project name and skip this question
    • Wait for response before continuing
  3. Agent type (ask third, but skip if #2 was sufficiently detailed): "What kind of agent are you building? Some examples:

    • Coding agent (SRE, security review, code review)
    • Business agent (customer support, content creation)
    • Custom agent (describe your use case)"
    • Wait for response before continuing
  4. Starting point (ask fourth): "Would you like:

    • A minimal 'Hello World' example to start
    • A basic agent with common features
    • A specific example based on your use case"
    • Wait for response before continuing

Read the full file on GitHub · 177 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago First seen · 177 lines · 9 tokens per session scan A d273539c037e

Subscribe to this mod's changes

new-sdk-app is a command published in the GitHub repository anthropics/claude-plugins-official (35,987 stars, last pushed 2d ago), licensed Apache-2.0. It adds 9 tokens to every session and 1,782 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.