# Built-in Agent Tools

Builds built-in agent tools with manifests, executors, renders and streaming.

- Repository: https://github.com/lobehub/lobehub (83676 stars)
- Category: AI and agents
- License: see repository
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add lobehub/lobehub --skill builtin-tool -g -a claude-code -y`
Codex: `npx skills add lobehub/lobehub --skill builtin-tool -g -a codex -y`
Cursor: `npx skills add lobehub/lobehub --skill builtin-tool -g -a cursor -y`
Gemini CLI: `npx skills add lobehub/lobehub --skill builtin-tool -g -a gemini-cli -y`

## Description

Use for LobeHub builtin agent tools: manifests, executors, runtimes, inspectors, renders, streaming and intervention.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Builtin Tool Authoring Guide

A builtin tool is a package the agent runtime can call. It ships **five faces**:

| Face                 | Lives in                                                                               | Audience                              |
| -------------------- | -------------------------------------------------------------------------------------- | ------------------------------------- |
| **Manifest + types** | `src/{manifest,types,systemRole}.ts`                                                   | The LLM (tool spec + system prompt)   |
| **ExecutionRuntime** | `src/ExecutionRuntime/`                                                                | Server / desktop / any runtime caller |
| **Executor**         | `src/client/executor/`                                                                 | Frontend (wraps stores/services)      |
| **Client UI**        | `src/client/{Inspector,Render,…}/`                                                     | Chat UI                               |
| **Registry wiring**  | `packages/builtin-tools/src/*.ts` + `src/store/tool/slices/builtin/executors/index.ts` | Framework                             |

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## Read These First

| Question                                                                             | Doc                                           |
| ------------------------------------------------------------------------------------ | --------------------------------------------- |
| Where do files live? What does each face do? Wiring?                                 | [architecture.md](references/architecture.md) |
| How do I name the tool, design APIs, write the manifest, executor, ExecutionRuntime? | [tool-design.md](references/tool-design.md)   |
| How do I build Inspector / Render / Placeholder / Streaming / Intervention / Portal? | [ui/](references/ui/README.md)                |

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## When to Use This Skill

The rest: https://github.com/lobehub/lobehub/blob/HEAD/.agents/skills/builtin-tool/SKILL.md