Clean, copy-paste tutorials for building AI agents: first-class code blocks, real eval results, and no fluff. Follow a path or jump straight to the step you need.
$ npm i && copy-paste the next step
Each path is an ordered run of copy-paste tutorials. Start at step one or drop in wherever you are.
Build a working agent loop with no framework: tool calls, memory, and control flow you fully own.
Drop an agent into an app you already ship, without rewriting your codebase or your data model.
Coordinate specialist agents: routing, hand-offs, and shared state across a multi-agent system.
Measure agents like software: metrics, regression suites, and traces that catch silent failures.
Single, self-contained walkthroughs you can finish in one sitting.
Anthropic merged custom slash commands into skills in 2026. Your .claude/commands files still work, nothing is deprecated, and the frontmatter you gain is the reason to move. Includes the command-name rule that catches everyone and a runnable collision audit.
Four launch-week tutorials carried a stored publication timestamp that predated the registration of agentnotebook.dev. The timestamps are corrected, the tutorial text is unchanged, and the check is one you can run yourself.
Claude Code has two memory systems and only one of them is capped. A precise 2026 walkthrough of CLAUDE.md load order, the auto memory directory, the 200-line-or-25KB index limit, and a runnable linter that measures your MEMORY.md the way Claude Code measures it.
Plan mode is not a read-only state. It is a rule at step 4 of a six-step permission evaluation, which is why allow rules stop applying while you plan and why a session with bypass permissions can edit anyway. The CLI keystrokes, the settings, the Agent SDK equivalent, and a plan-then-execute pipeline in Python and TypeScript. August 2026.
The /agents creation wizard was removed in Claude Code v2.1.198, so almost every guide still ranking for this topic teaches a flow that no longer exists. Here is the current way to write, scope, invoke, and cap Claude Code subagents, with a version number on every claim. August 2026.
InvalidUpdateError: Can receive only one value per step means two parallel LangGraph nodes wrote the same state key with no reducer. Reproduce it in 15 lines and fix it the right way in Python and TypeScript (2026).
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Anthropic merged custom slash commands into skills in 2026. Your .claude/commands files still work, nothing is deprecated, and the frontmatter you gain is the reason to move. Includes the command-name rule that catches everyone and a runnable collision audit.
Four launch-week tutorials carried a stored publication timestamp that predated the registration of agentnotebook.dev. The timestamps are corrected, the tutorial text is unchanged, and the check is one you can run yourself.
Claude Code has two memory systems and only one of them is capped. A precise 2026 walkthrough of CLAUDE.md load order, the auto memory directory, the 200-line-or-25KB index limit, and a runnable linter that measures your MEMORY.md the way Claude Code measures it.
Found a bug in a tutorial, want a topic covered, or shipping something with these patterns? Send the details. Code snippets and repro steps welcome.
