# Agent Handbook — AI Agent Playgrounds & Guides

> AI Agent Playgrounds & Guides (iPhone/iPad app by 琦喻 周.)

- Source: https://appshunter.io/ios/app/agent-handbook/id6769305242 (this page in markdown: same URL + `.md`)
- Developer: [琦喻 周](https://appshunter.io/developer/1805041997)
- Category: Reference, Education
- Price: $2.99
- Age rating: 4+
- Requires: iOS 15.1 · 31 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan), Vietnamese
- Released: 2026-06-15
- Data updated: 2026-07-23

## What is Agent Handbook?

Agent Handbook is a hands-on field guide for building AI agents — right from your iPhone.

EIGHT BOOKS, 52 CHAPTERS
- Foundations: prompts, context, tokens, latency
- Reasoning models: when to use thinking vs non-thinking
- Multi-modal: vision, audio, document understanding
- Tools and MCP: how agents call the outside world
- Multi-agent: coordinator, specialist, debate patterns
- Streaming: tokens, deltas, partial tool calls
- Vision: OCR, layout, screenshots
- Production: cost, eval, observability, safety

FIVE LIVE PLAYGROUNDS
- Chat: talk to any model with streaming and chain-of-thought
- AI Advisors: switch between specialist personas
- Tool Playground: 12 simulated tools (pwd, list_directory, http_request, translate, run_shell and more)
- MCP Simulator: explore the Model Context Protocol offline
- Multi-agent: orchestrate two or more models in one conversation

BRING YOUR OWN KEYS
- OpenAI, Anthropic, Google, DeepSeek, plus any OpenAI-compatible endpoint
- Curated 2026 model registry: GPT-5.5, Claude Opus 4.7, Gemini 3 Pro, DeepSeek V4 Pro
- Capability badges (thinking, vision, audio, tools) on every model
- Custom model tags so you can register your fine-tuned variants

PRIVACY FIRST
- Your API keys live in iOS Keychain. They never reach our servers
- Direct HTTPS calls from your device to the provider you chose
- Zero analytics, zero tracking, zero ads

6 LANGUAGES
English, simplified Chinese, traditional Chinese, Japanese, Korean, Vietnamese.

## Is Agent Handbook safe?

Not enough ratings yet to assess Agent Handbook.

## Is Agent Handbook legit?

Agent Handbook has limited verification signals. The AppsHunter Legitimacy Score for Agent Handbook is 55 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0.0 — 2026-06-15

No release notes.

## More apps by 琦喻 周

- [Jieqi Almanac](https://appshunter.io/ios/app/jieqi-almanac/id6768136819)
- [Heritage Colors](https://appshunter.io/ios/app/heritage-colors/id6768435832)

All apps by 琦喻 周: https://appshunter.io/developer/1805041997

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-23.*