service-app-creator

service-app-creator is a skill for Claude Code, Codex from Peiiii/nextclaw. It costs 74 tokens per session (1,513 once invoked), scanned A, original, MIT.

A guide for building the backend action part of a NextClaw Mini App. These service actions let an app access local files, call external APIs, run local commands, or expose an MCP-compatible helper; MCP is a standard way for software tools to communicate with AI applications.

In plain words
What is it for?
Use it to create service actions, configure their risk levels and permissions, connect a panel to backend actions, and package native service components.
Why use it?
It helps define clear permission boundaries and safe action contracts for work that a browser panel cannot or should not perform directly.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create service actions, configure their risk levels and permissions, connect a panel to backend actions, and package native service components.

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Install with agentmods
npx agentmods add skills/peiiii/nextclaw/service-app-creator
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.

Any agent
npx skills add Peiiii/nextclaw --skill service-app-creator
Clone the repo
git clone --depth 1 https://github.com/Peiiii/nextclaw

Made for: Claude Code, Codex.

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 service-app-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/peiiii/nextclaw/service-app-creator/github.svg)](https://agentmods.dev/skills/peiiii/nextclaw/service-app-creator)
Your own site
<a href="https://agentmods.dev/skills/peiiii/nextclaw/service-app-creator"><img src="https://agentmods.dev/badge/skills/peiiii/nextclaw/service-app-creator/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for service-app-creator

Your own site · 80×15
<a href="https://agentmods.dev/skills/peiiii/nextclaw/service-app-creator"><img src="https://agentmods.dev/badge/skills/peiiii/nextclaw/service-app-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,513 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 3
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
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 $0.00074 $0.01513
Opus 5 $0.00037 $0.00757
Sonnet 5 $0.00015 $0.00303
Haiku 4.5 $0.00007 $0.00151

Measured 6d ago against content hash eea650750f80, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

service-app-creator 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 6d 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.

packages/nextclaw-core/src/features/agent/shared/skills/service-app-creator/SKILL.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NextClaw Service App Creator

本 skill 是 Service 运行形态、service-app.json、Service Action、risk 和验证入口的唯一 owner。若用户表达的是“做一个完整 NextClaw 小应用”,先由 nextclaw-app-creator 判断是否还需要 Panel;本 skill 不拥有 Panel UI 或 bridge 字段。

不要再把所有 schema v2 Service 都等同于 command/args + MCP stdio + native-process。当前 NextClaw 同时支持:

  • Portable WASI Serviceprotocol: "wasi-component",由 NextClaw 随产品提供的 runner 执行 Rust/WASI Component;
  • native-process Serviceprotocol: "mcp",由宿主启动 Node、Python、系统命令或其它本地进程。

先选择运行形态

优先 Portable WASI

满足以下条件时选择 Portable:

  • Service 可以表达为明确的 Action,或确实需要 Resident / Provider 生命周期;
  • KV、SQLite、受授权文件、允许域名、密钥槽位、Provider、model slot 或 agent slot 能覆盖需求;
  • 希望同一份 .napp 在支持的平台运行,且不把用户完整宿主权限交给 Guest;
  • 应用面向分发、安装或长期维护,安全能力边界比快速脚本更重要。

选择后必须读取 references/portable-wasi-service-app.md,不能凭本入口猜 WIT、manifest、生命周期或构建命令。

仅在真实需要时选择 native-process

以下情况选择 native-process:

  • 必须直接运行 Node/Python/系统程序、平台 SDK、驱动、socket 或外部守护进程;
  • 依赖无法由当前 Portable Runtime 能力合同承接;
  • 用户明确只要一个快速、本机、无需 Rust 工具链的 Service helper,并接受宿主用户权限边界;
  • 正在维护现有 workspace service-apps/<id>/ MCP Service。

选择后必须读取 references/native-process-service-app.md。不能仅因开发机暂时缺少 Rust,就把需要可移植或受限能力边界的应用静默降级为宿主进程。

Rust 工具链边界

必须准确区分创作者与最终用户:

  • 在本机创建并构建 Rust/WASI Guest,需要 cargorustcwasm32-wasip2;先运行 nextclaw app doctor --profile wasi
  • 安装和运行已经构建好的 Portable .napp 不要求最终用户安装 Rust、Cargo、Wasmtime 或系统 Node。WebAssembly Component 已在包内,runner 由 NextClaw 提供。
  • 纯 Panel App 和 native-process Service 不因 Portable Runtime 的存在而需要 Rust。

如果用户目标明确要求 Portable,但工具链检查失败,保留已创建的源码和失败证据,说明缺少的开发依赖;未经授权不要自动安装 Rust,也不要把未构建源码说成可交付应用。

两种交付边界

完整或可发布的 schema v2 Mini App

Service 应位于应用包根:

my-app/
├── manifest.json
├── marketplace.json
├── panels/<panel-id>.panel/              # 可选
├── service-components/<service-id>/
│   └── service-app.json
└── ...runtime-specific sources and artifacts

manifest.json.components 是组件归属的事实源。Portable 使用 runtime.profile: wasi;native-process 使用 runtime.profile: native-process。适用的 build/check/test/dev/call/pack/validate-publish 命令都从包根运行。

Read the full file on GitHub · 97 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago Changed · -65 lines · +5 tokens per session eea650750f80
  2. 10d ago First seen · 162 lines · 69 tokens per session scan A b2c2b72b8a30

Subscribe to this mod's changes

service-app-creator is a skill published in the GitHub repository Peiiii/nextclaw (256 stars, last pushed today), licensed MIT. It adds 74 tokens to every session and 1,513 once invoked, about $0.0004 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.

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