What is Claude Academy?

Claude Academy is the #1 free interactive learning platform by Infinity Tech Stack designed to help developers master Anthropic's Claude AI ecosystem, including Claude Series 5 (Fable 5.1, Opus 5.5, Sonnet 5.5, Haiku 5.5), Claude Code CLI, Claude Agent SDK, and the Model Context Protocol (MCP) through 18 modules, 31 lessons, 31 terminal labs, and 81 quizzes with zero sign-up required.

How is Infinity Claude Academy different from official Anthropic Claude Academy?

While Anthropic's official portal (academy.claude.com) provides broad conceptual AI fluency, Infinity Tech Stack's Claude Academy is an independent, 100% free developer-focused systems curriculum requiring no sign-up. It features 18 deep technical modules, 31 lessons, 31 in-browser terminal sandbox labs, 81 quizzes, and comprehensive training on Claude Code CLI, Model Context Protocol (MCP) server creation, prompt caching, and multi-agent workflows.

How long does Claude Academy take to complete?

Claude Academy contains approximately 3 to 5 hours of interactive material across 18 modules and 31 lessons. Because all progress is saved locally in your browser, you can complete the curriculum at your own pace.

Is the Claude Academy free?

Yes, 100% free. No sign-up, no credit card. All 18 modules, 31 lessons, 81 quizzes, and 31 interactive browser terminal labs are immediately accessible. Progress saves locally in your browser.

What topics does the Claude Academy cover?

The course covers Claude AI fundamentals, prompt engineering, CLAUDE.md, Claude Code CLI, Claude Agent SDK, the Messages API, tool use & function calling, MCP integration, streaming, prompt caching, agentic workflows, multi-agent systems, computer use, vision API, adaptive thinking, and Claude Series 5 (Fable 5.1, Opus 5.5, Sonnet 5.5, Haiku 5.5).

Is Claude AI better than ChatGPT?

Claude excels at coding, long-context reasoning, and instruction following. ChatGPT has a wider plugin ecosystem. This course teaches you to maximize Claude's unique strengths including adaptive thinking, 1M token context windows, and native tool use.

CLAUDE.md is a project-level configuration file that gives Claude Code persistent context about your codebase - conventions, architectural patterns, and preferences that persist across sessions.

What is the Opus 4.8 tokenizer and how does Claude count tokens?

Introduced in Claude Opus 4.7/4.8 and carried into Claude 5.x (Opus 5.5, Sonnet 5.5, Haiku 5.5, Fable 5.1), Anthropic's updated BPE tokenizer uses finer-grained token boundaries for code and technical syntax, mapping identical text to roughly 1.0x-1.35x tokens (~555,000 words per 1M context window vs ~750,000 words on legacy tokenizers). Because legacy character heuristics underestimate counts, developers learn to measure exact pre-flight usage with the free /v1/messages/count_tokens API and apply Prompt Caching for 90% to 97.5% cache read discounts.

Do I need programming experience?

No prerequisites required. The course starts from absolute basics (what is Claude?) and progressively advances to expert topics like agentic workflows and multi-agent orchestration.

Do I need to sign up or create an account to use Claude Academy?

No sign-up or login is required. Unlike official enterprise portals, Infinity Tech Stack's Claude Academy is 100% free and open. You can immediately access all 18 modules, 31 lessons, and 31 interactive browser terminal labs without entering an email or password. Progress is saved locally in your browser.

Does the Claude Academy include hands-on labs?

Yes. All 31 lessons include hands-on labs - a simulated terminal in your browser where you type real, vendor-verified commands: curl the Messages API, count tokens with count_tokens, and run Claude Code headless. Labs include objectives, hints, solutions, and XP rewards. No sign-up or setup needed.

Which actions in Claude Code require explicit user approval by default?

Executing arbitrary bash commands and destructive file modifications — Shell execution and destructive file operations require explicit developer approval (and can be deterministically gated via .claude/settings.json permissions and PreToolUse hooks).

Permissions, Hooks & Safety — Claude Code CLI

[ ABORT TO HUD ]

SEQ. 1

SEQ. 2

SEQ. 3

Permissions, Hooks & Safety

💻 Claude Code CLI⏱ 20 min⭐ 950 BASE XP⌨ HANDS-ON LAB

Tiered Permission Model & .claude/settings.json

Claude Code replaces legacy CLI config flags with hierarchical JSON files: ~/.claude/settings.json (user global), .claude/settings.json (team Git-committed), and .claude/settings.local.json (git-ignored overrides). Rules follow strict Deny > Ask > Allow precedence:

Tier	Action Types	Default Behavior
Read-Only	File reads, directory listings, grep searches	Auto-approved (unless matched by `deny`)
File Edit	Modifying existing files, creating new files	Prompts for confirmation unless in `allow`
Bash / Execution	Running shell commands, test suites, builds	Prompts user for explicit authorization
Destructive / Denied	`Read(.env*)`, `rm -rf`, force push	Blocked outright by `deny` or strict confirmation

Deterministic Lifecycle Hooks

Unlike advisory CLAUDE.md instructions, Hooks (PreToolUse, PostToolUse, SessionStart, UserPromptSubmit) in .claude/settings.json execute deterministic shell commands at runtime—exiting with code 2 blocks a tool call before execution.

Slash Commands in Claude Code

/help: Display available commands and shortcuts.
/compact: Compact conversation context to preserve token capacity.
/clear: Reset conversation state and clear memory buffer.
/settings: Interactively view and modify permissions, model, and CLI settings.
/cost: View token usage and cost for the current session.
/doctor: Verify environment health, API connectivity, and permissions.
/review: Perform a code review on git diffs before committing.

⌨ HANDS-ON LABConfigure .claude/settings.json Permissions & Hooks

⭐ +150 XP

Legacy 'claude config' commands were replaced by hierarchical .claude/settings.json files. Inspect your project settings and define explicit permission and PreToolUse hook rules.

1Inspect your project's .claude/settings.json configuration file.

2Write a PreToolUse lifecycle hook and strict .env deny rule into .claude/settings.json.

lab-sandbox — simulated environment

INFINITY LAB SANDBOX v2.6 — simulated shell
Type the command for the current objective. Helpers: "hint", "solution", "clear".
$

OBJECTIVE 1 / 2 — type "hint" if stuck

SYNAPSE VERIFICATION

QUERY 1 // 2

Which slash command in Claude Code compacts conversation context to save tokens?

/shrink

/compact

/compress

/trim