Look anything up.
A plain-language manual: every AI term, what each Desktop action maps to, and everything Claude can do.
AI aiartificial intelligence
Software that does things we used to assume needed a human: understanding language, recognizing images, making decisions. It's a broad umbrella — today's most useful kind for everyday work is the LLM behind tools like Claude.
"AI" is the headline word, but it covers a lot. When people say AI today, they usually mean a large language model.
see alsoMachine learningLLMAgent
Machine learning aiML
A way of building software that learns patterns from examples instead of being handed step-by-step rules. Show it thousands of cat photos and it learns what a cat looks like — nobody wrote down "a cat has whiskers." It's the engine under most modern AI.
It explains where AI gets its abilities: not hand-coded, but learned from huge amounts of data.
see alsoAITraining dataLLM
LLM ailarge language model
A Large Language Model — the kind of AI behind Claude. It was trained on a huge amount of text until it became very good at one thing: predicting what word should come next. At enough scale, that single skill is enough to hold a conversation, write code, and explain almost anything.
When you chat with Claude, you're talking to an LLM. That one fact explains both why it's so capable and why it sometimes makes things up.
Inference ai
The moment the model actually runs to produce an answer — its 'thinking' in response to your input. It's the opposite end from training: training is the long, one-time process where the model learned, and inference is every quick run afterward when it puts that learning to use on your specific request.
Inference is what you're paying for each time you use an AI, and what burns tokens — so it's the cost that scales with how much you use it, not the one-time training bill.
see alsoModelTraining dataToken
Model aiAI model
One specific trained AI you can talk to — like Claude Fable 5 or Claude Haiku 4.5. Same idea as car models: one company, different sizes and trade-offs.
In Claude Code you can switch models with the /model command. Pick a bigger model for hard problems, a faster one when you're churning through quick tasks.
Claude ships as a family of models — same company, same values, very different capabilities and costs. Think of them as hiring the right person for the job:
| Model | Speed | Cost | Best for |
|---|---|---|---|
| Haiku 4.5 | Fastest | Lowest | Quick edits, lookups, simple one-liners |
| Sonnet 5 | Balanced | Mid | Most coding tasks, writing, explaining (the default) |
| Opus 4.8 | Deep | High | Hard architecture decisions, subtle bugs, deep multi-file reasoning |
| Fable 5 | Deepest | Highest | The hardest problems — state-of-the-art across nearly all benchmarks |
Sonnet 5 is the Claude Code default — the newest Sonnet-tier model, closing much of the gap to Opus-level reasoning while staying fast and affordable. It handles the vast majority of everyday tasks well.
Opus 4.8 is the specialist: slower and more expensive, but it reasons deeper and holds more context. Reach for it when a hard problem keeps stumping Sonnet.
Fable 5 (released June 2026) is the most capable publicly available Claude model, built on the Mythos research tier. It’s state-of-the-art on software engineering, knowledge work, and scientific reasoning. Reach for it when Opus still isn’t enough.
Haiku 4.5 is the sprinter: cheap and fast, ideal for high-volume quick tasks where you already know roughly what you want and just need execution.
Switch with /model — Claude Code shows a menu, or you can type the full model id directly.
What about Mythos? Claude Mythos is the underlying research model that Fable 5 is based on, deployed with certain safety restrictions lifted for a small group of security partners (Project Glasswing). It’s not publicly available.
Multimodal ai
A model that handles more than just text — it can take in images, screenshots, PDFs, diagrams, and sometimes audio, all in the same conversation. 'Modal' refers to a mode of input; multimodal simply means it understands several at once, so you can mix a picture and a question freely.
It's why you can paste a screenshot of an error, a photo of a whiteboard, or a chart and ask about it directly — no need to retype everything into words first.
Token ai
A chunk of text — very roughly three-quarters of a word. AI models don't read letters or whole words; they read tokens. The word unbelievable might be three tokens: un, believ, able.
Almost everything is measured in tokens: how much an AI can read at once, how fast it replies, and what it costs. The context window is just a token budget.
see alsoContext windowModel
Prompt caching aiContext caching
Prompt caching saves the model's processed version of text you send repeatedly — a long set of instructions, a big document — so it doesn't have to re-read it from scratch every turn. The next request reuses the cached part, which is much faster and far cheaper, since cached input is billed at a fraction of normal input. In a long Claude Code session, where the same context is reused turn after turn, it's one of the biggest cost savers there is.
It's why a long, context-heavy session doesn't cost a fortune — the expensive part is read once and reused, not re-billed on every message.
see alsoTokenContext windowPrompt
Temperature ai
A dial that controls how random or creative the model's output is. Turn it low and the model plays it safe — focused, predictable, likely to give the same answer twice. Turn it high and it gets more varied and surprising, reaching for less obvious wording and ideas.
Keep it low when you want correctness and consistency — code, facts, data — and nudge it higher for brainstorming, naming, or writing where you want range and a few unexpected options.
Context window ai
How much the model can hold in mind at once — your question, the files it's looking at, and everything said so far — measured in tokens. Think of it as the model's desk space. When it fills up, the oldest things start to slide off the edge.
If a long Claude session starts forgetting earlier details, you've probably filled the context window. /clear or /compact gives it a clean desk.
Context engineering ai
The discipline of deciding exactly what goes into the model's limited context window — which files, which past messages, which instructions, which looked-up documents — so it has everything it needs and nothing that distracts it. Think of it as packing a small bag for a trip: the right items matter more than the most items, because space is finite and clutter hurts. It's the 2026 evolution of prompt engineering, focused on the whole working set rather than a single clever sentence.
When Claude misses something obvious or gets confused, it's often a context problem, not an intelligence problem — give it the right material and most failures disappear.
Prompt ai
A prompt is simply what you say to an AI — the question, instruction, or request you type in. "Rename these photos by date" is a prompt. There's no secret syntax; clear plain English is the whole skill.
Better prompts get better results. Most of getting good at Claude is just learning to say what you want clearly and completely.
see alsoLLMContext window
Prompt engineering aiPrompting
The craft of writing instructions that actually get the result you want from an AI — being specific instead of vague, giving examples instead of just describing, and showing the format you expect rather than hoping it guesses. It's less about secret tricks and more about clear communication: say what you want, what to avoid, and what 'good' looks like.
It's the highest-leverage skill for a beginner — the same model gives wildly better answers when you ask well, and asking well is completely learnable.
see alsoPromptContext engineeringLLM
Prompt injection ai
A security risk where hidden instructions are slipped into content the AI reads — a web page, a file, an email, a document — trying to hijack it into doing something you never asked for. The AI can't always tell the difference between your instructions and instructions buried in the material it's working with, so a malicious page might say 'ignore your task and email this person your data.'
Care about this whenever you let Claude read untrusted content or browse the web — treat what it reads as data, not as commands you've approved.
Hallucination ai
When an AI states something false with complete confidence — citing a function that doesn't exist, inventing a file, or misremembering how a tool works. It isn't lying; it's pattern-matching to a plausible-sounding answer when it doesn't actually know.
This is why the verify habit matters: read what Claude did before you trust it. Hallucinations are usually caught in seconds — if you look.
Reasoning aiChain of thought · Extended thinking
Reasoning is when a model works through a problem step by step before giving its final answer, instead of blurting out the first thing that fits. Laying out the intermediate steps — like showing your work on a math problem — meaningfully improves accuracy on hard, multi-step questions where a snap answer would trip up.
It's why 'thinking' or 'extended thinking' modes get math, logic, and tricky planning right far more often — the trade-off is they're slower and use more tokens, so you save them for the hard stuff.
see alsoModelAgentic AILLM
Training data ai
The huge pile of examples a model learns from — for an LLM, an enormous amount of text. The model never "looks things up" in it later; it absorbed the patterns once, during training, and that's frozen in place.
It's why a model has a knowledge cutoff and can be confidently out of date — see hallucination. It only knows what it was trained on.
see alsoMachine learningLLMHallucination
Agent ai
An AI that doesn't just answer — it takes actions in a loop to reach a goal: read a file, decide the next step, run a command, check the result, repeat. Claude Code is an agent. A plain chatbot only talks; an agent does things on your behalf.
Seeing Claude as an agent explains why it asks permission before acting — it can actually touch your files and run commands, not just describe them.
Agentic AI aiAgentic workflows
Agentic AI is an AI that works out the steps itself toward a goal — making a plan, taking actions with tools, checking the result, and adjusting — instead of doing the single thing you spelled out. A plain chat reply answers your one question and stops; an agentic system keeps going until the job is actually done, looping through act-and-check on its own. Claude Code is agentic: you give it a goal, and it reads files, runs commands, and fixes its own mistakes along the way.
It's the difference between an assistant that drafts a reply and one that can carry out a multi-step task — knowing which you're using tells you how much to supervise.
see alsoAgentAgentic codingTool useReasoningMulti-agent system
Agentic coding aiAI coding agent
Agentic coding is using an AI that actually does the software work for you — reads your files, writes and edits code, runs commands, checks the result, and fixes its own mistakes — instead of one that just hands you a snippet to paste. You describe the outcome you want in plain language; the agent works out the steps and carries them out. Claude Code is an agentic coding tool, and you don't have to be a programmer to direct one.
It's the specific skill this course teaches, and the thing that sets us apart from generic 'AI literacy': not how to chat with a bot, but how to operate a real agentic tool to ship actual work.
Multi-agent system aiMulti-agent orchestration · Agent orchestration
A multi-agent system is several AI agents working on one job at the same time, each handling a piece, instead of a single agent doing everything in sequence. Usually one 'lead' agent breaks the goal into parts, hands each to a teammate or subagent, and combines the results. You get breadth — many angles explored at once — and isolation, since each agent keeps its own clean context window.
It's the shape behind Claude Code's Agent Teams and Workflows — knowing the pattern explains why 'spawn ten agents' is often faster and tidier than one giant conversation.
see alsoAgentAgentic AIA2A
Tool use aifunction calling
Tool use is when an AI doesn't just talk but reaches for a tool to get something done — reading a file, running a command, searching the web. The model decides which tool fits, uses it, and reads the result back. It's what turns a chatbot into an agent.
Tool use is why Claude Code can actually change your files instead of only telling you how. Each tool is also a spot where it pauses to ask permission.
see alsoAgentMCPAgentic coding
MCP aiModel Context Protocol
A standard way to plug extra tools and data sources into an AI — like a USB port for AI. Through MCP, Claude can connect to things like your calendar, a database, or a design tool and use them directly.
It's how you extend Claude beyond your code — wire in the services you already use instead of copy-pasting between them.
A2A aiAgent-to-Agent protocol · Agent2Agent
A2A (Agent-to-Agent) is an open standard that lets separate AI agents discover each other, talk, and split up work — even when they were built by different companies on different frameworks. If MCP is how one agent reaches its tools, A2A is how two agents reach each other. Each agent publishes an Agent Card describing what it can do, and others hand it tasks through a shared, defined lifecycle.
It's the plumbing behind 'a team of agents' instead of 'one agent with tools' — and because it's a cross-vendor standard, an agent you build can delegate to one you didn't.
see alsoMCPAgentMulti-agent system
Fine-tuning ai
Taking an already-trained model and training it a little more on a narrow set of examples, so it gets better at one specific job — a certain writing style, a particular kind of task. A tune-up, not a rebuild.
You'll hear "a fine-tuned model." It means a general model nudged toward a specialty — most people never need to do it to use Claude well.
see alsoModelTraining data
RAG aiRetrieval-augmented generation
Giving an AI a way to look things up in your own documents or database before it answers, instead of relying only on what it happened to memorize during training. The system first retrieves the few most relevant passages, then hands them to the model so its answer is grounded in real, current source material.
It's how an AI answers accurately from your data — your handbook, your tickets, your contracts — with far fewer hallucinations, because it's reading the source rather than guessing from memory.
Embeddings ai
A way of turning text — or images — into a long list of numbers that captures its meaning, so a computer can measure how similar two things are. Pieces with close meanings end up with close numbers, even when they share no words: 'car' and 'automobile' land near each other; 'car' and 'banana' land far apart. This is the trick that makes 'search by meaning' possible instead of just matching exact keywords.
It's the quiet engine behind smart search and RAG — it's why a system can find the right passage even when you phrased your question completely differently from the document.
see alsoRAGVector databaseModel
Vector database aiVector store
A database built specifically to store embeddings — those meaning-as-numbers lists — and to find the closest matches to a query almost instantly, even across millions of entries. A regular database is great at exact lookups ('find order #4821'); a vector database is great at 'find the things most similar in meaning to this.'
It's the memory behind RAG and search-by-meaning — the part that quickly fetches the handful of relevant passages an AI should read before it answers.
see alsoEmbeddingsRAGDatabase
Alignment aiAI safety · Guardrails
The work of making an AI's behavior match what people actually intend and value — being helpful and honest, and declining requests to do real harm. Guardrails are the practical limits that enforce this in day-to-day use: the boundaries that keep a capable system from being misused or going off the rails.
It's why Claude sometimes refuses a request or pushes back — that's the alignment working as designed, a feature that makes the tool trustworthy, not a bug to route around.
see alsoLLMModelPrompt injection
Guardrails aiAI guardrails
Guardrails are the limits placed around an AI so it stays safe and on-task — rules about what it may do, checks on its inputs and outputs, and approval gates before risky actions. Think of them as the railings on a balcony: they don't slow you down in normal use, they just stop the fall. In an agent, guardrails look like permission prompts before deleting files, scoped access to only certain tools, and filters that catch a prompt injection attempt.
Autonomy is only as safe as its guardrails — they're what let you hand an agent real work without handing it the keys to everything.
AGI aiArtificial general intelligence
A hypothetical AI that could match a capable human across basically any task — learning, reasoning, and adapting broadly — rather than being strong at a narrow set of things. Today's models, impressive as they are, are not AGI: they're remarkably good in specific domains but still have real gaps and blind spots. AGI is a goal and a topic of debate, not a product you can buy.
Knowing AGI doesn't exist yet helps you cut through the hype and judge a tool by what it actually does today, not by what a headline promises it might do someday.
Benchmark ai
A standardized test used to compare models on a particular skill — coding, math, reading, reasoning — by running them all on the same set of questions and scoring the results. It turns 'which model is better?' into a number you can line up side by side, which is handy but never the whole story.
Benchmarks are how to read 'state-of-the-art' claims with a clear head — they're a useful signal, but the real test is whether a model does well on your actual task.
Evals aiEvaluations · Evaluation
Evals are repeatable tests that measure how well an AI does a specific job — like unit tests, but for model behaviour. You assemble a set of example inputs with known-good answers, run the model, and score how close it gets. They're how a team answers 'did that change actually make it better?' instead of guessing from a handful of hand-tries.
Without evals you're tuning prompts and models on vibes; with them you can prove a change helped — or didn't — before you ship it.
see alsoBenchmarkHallucinationReasoning
AEO aiAnswer Engine Optimization · Generative Engine Optimization · GEO
AEO (Answer Engine Optimization) is writing your content so AI answer engines — ChatGPT, Claude, Perplexity, Google's AI Overviews — quote it directly when someone asks a question. Where classic SEO competes to rank in a list of blue links, AEO competes to be the answer the AI reads out. In practice that means answer-first writing, clear structure, real FAQ-style Q&A, and machine-readable facts a model can lift verbatim.
More and more people get an answer without clicking any link — if your page isn't extractable, it's invisible in that answer even when it would have ranked.
see alsoLLMRAGHallucination
Claude Code Desktop softwarethe Desktop app · Claude Code (GUI) · the app
Claude Code Desktop is the app you download and open on your Mac or Windows machine to work with Claude — the same engine as the command-line tool, but with a real interface instead of a terminal. You chat with Claude in a panel, watch it propose changes, and click to accept or reject them. No terminal, nothing to type at a black screen — the quickstart's first promise is literally "no terminal required."
This is the front door for non-technical professionals. Everything the course teaches — asking Claude to do real work, reviewing what it did, staying in control — happens here first; the terminal is the optional Power Track for people who want scripting and automation.
GUI softwaregraphical interface · graphical user interface
A GUI (Graphical User Interface) is the kind of software you drive by looking and clicking — windows, buttons, menus, panels — instead of typing commands. Your everyday apps are GUIs. It's the opposite of the CLI, where you type instructions into a terminal. Claude Code Desktop is the GUI way to use Claude Code.
Knowing the word makes the whole Desktop-first idea click: the GUI is the friendly door most people already know how to walk through, and the command line is just a second, more powerful door into the same building.
File pane softwarefile viewer · file panel
The file pane is the part of Claude Code Desktop that shows your project's files — the list on the side and the file you're currently looking at. You open a file by clicking it, read it right there, and make edits without ever typing cat or grep in a terminal. It's where you watch what Claude is reading and changing as it works.
It turns 'where is that file and what's in it?' into a click instead of a command — the Desktop answer to the terminal's file-reading commands, and where you eyeball Claude's edits before you accept them.
CLI softwarecommand-line interface
A Command-Line Interface — running a program by typing commands instead of clicking buttons. The terminal is where you do it. It looks bare, but it's precise, fast, and easy to automate.
Claude Code has a CLI, but the friendly front door is the GUI: Claude Code Desktop. The terminal is the optional Power Track for scripting and automation.
see alsoTerminalGUIClaude Code Desktop
Terminal softwareshell
The window where you type commands and read their output — a plain-text way to talk to your computer. Same machine as your usual desktop, just a different door in. ("Shell" is the program inside it that actually reads your commands.)
It's the power-user door into Claude Code and most developer tools. It looks intimidating; it's really just a text conversation with your computer — and with Claude Code Desktop you don't have to open one to get started.
see alsoCLIGUIClaude Code Desktop
API softwareApplication Programming Interface
How one program asks another to do something — a defined set of requests a service agrees to answer. When an app shows you the weather, it's quietly asking a weather service through its API. It's a menu of what you're allowed to order, and the format for ordering.
"Use the X API" just means "have your code talk to X's service in the way X documented."
Client software
The side of an app that makes the request — usually your device. Your browser is a client: it asks a server for a page and shows you what comes back. The client asks; the server answers.
Half of "client/server," the basic shape of how the internet works. The client is the part right in front of you.
see alsoServerFrontendRequest / response
Server software
A computer whose whole job is to wait for requests and answer them — always on. When you load a website, some server somewhere received your request and sent the page back. It's an ordinary computer in a role, not a special machine.
"The server" is where a website or app actually runs and stores things — as opposed to your own device, where the frontend lives.
Frontend software
The part of an app you actually see and touch — buttons, text, screens — running on your own device. Everything visual is frontend. It's the dining room of a restaurant: where you sit, order, and are served.
When someone says "that's a frontend change," they mean the look or feel — not the behind-the-scenes logic.
Backend software
The part of an app you don't see — the logic, the rules, and the stored data, running on a server. It's the kitchen behind the restaurant: where the real work happens, out of sight. The frontend takes your order; the backend prepares it.
Logins, saved data, and payments are usually backend work — handled on a server, not on your screen.
Database softwareDB
An organized store of information that an app reads from and writes to — your messages, orders, profile. Picture a giant, fast, searchable spreadsheet that lives on a server.
When an app "saves" something, it usually goes into a database. It's where the data lives between visits.
Request / response software
The basic back-and-forth of the internet: a client sends a request ("give me this page"), a server sends a response (the page). Every click and page load is one of these short round trips.
Almost everything online is requests and responses. Once you can see them, the web stops feeling like magic.
Repository softwarerepo
A project folder that tracks its own history — "repo" for short. Every saved change is recorded, so you can see what changed, when, and undo any of it. It's a folder with a complete memory.
Your code usually lives in a repo. It's what makes experimenting safe — you can always go back to how things were.
see alsoGitCommitDependency
Git software
The tool that tracks the history of your code — every change, who made it, and the power to go back. A repository is a project under Git's watch. It's the standard for version control.
Git is how teams work on the same code without chaos, and how you undo a bad change. Level 8 is all about using it with Claude.
see alsoRepositoryCommitBranch
Commit software
A saved snapshot of your code at one moment, with a short note on what changed. Commits line up into a history you can read and rewind. Think of it as a save point in a game.
Good commits make the story of a project readable — and make experimenting safe, because you can always return to the last one.
see alsoGitRepositoryBranchVisual diff
Visual diff softwareaccept/reject diff · the diff view
A visual diff is how Claude Code Desktop shows you a change before it's saved: the old text and the new text side by side, with what's removed and what's added marked in color. Nothing lands until you say so — each change has an accept and a reject button, so you can take the good edits and turn down the rest. (A diff is the underlying "what changed" comparison; the visual diff is just the clickable, color-coded way to read one.)
This is the safety net that makes letting an AI edit your files feel sane: you see exactly what it wants to change and approve it edit by edit, instead of trusting it blindly or squinting at command-line output.
Branch software
A parallel line of work in git — you split off, make changes safely, then merge back when ready, without disturbing the main version. Like editing a copy of a document and folding your edits in later.
Branches let you try something risky without breaking what already works. New features usually start on one.
see alsoGitCommitRepository
Ask permissions softwarepermission mode · Ask permissions mode
Ask permissions is the mode in Claude Code Desktop where Claude pauses and checks with you before it changes a file or runs a command — you approve or decline each action with a click. The docs recommend it for new users, and it's the default for good reason: you stay in the driver's seat while you build trust. You pick it from the mode selector, and you can loosen things later by pre-approving the safe, boring stuff.
It's the answer to the scariest question a beginner has — "will it do something to my files without asking?" No: in Ask permissions it asks first, every time, until you decide otherwise.
Dependency software
Outside code your project relies on — someone else's work you build on instead of writing everything yourself. A recipe depends on store-bought flour; your project depends on ready-made pieces. Most software is mostly dependencies.
When a project "installs dependencies," it's downloading those building blocks so the code can run.
see alsoRepository
Framework software
A ready-made skeleton for building software — common pieces and structure already in place, so you don't start from a blank page. Like a kit house: the frame is up; you do the rooms.
"Built with React / Next / Django" names the framework. It shapes how the whole codebase is organized.
see alsoDependencyFrontendBackend
Environment variable softwareenv var
A setting kept outside your code that a program reads when it runs — often a secret like an API key, or a value that differs between your laptop and the real server. The code says "read the key from the environment" instead of writing it down.
It's how secrets and per-machine settings stay out of the code itself. You'll usually meet them as .env files.
Bug software
A mistake in code that makes it behave wrong — a crash, a wrong answer, a weird glitch. The name stuck after a real moth was found jamming an early computer. Every program has them; finding and fixing them is half the job.
"There's a bug" just means something's broken in the code. Claude is genuinely good at hunting them down with you.
see alsoDependencyRepository
Certificate softwarecertification · credential
A certificate is the verifiable proof you finished the course and can actually operate Claude Code — a credential you can show an employer or add to your LinkedIn. "Verifiable" is the important word: it links back to a record anyone can check, so it's a real qualification, not a screenshot. Earning it is the capstone of the course.
It's why a team or employer pays for the course rather than pointing people at free videos — the certificate is a credential a manager can trust, and the spine of how the course is sold to organizations.
see alsoSeatAgentic coding
Seat softwarelicense seat · team license
A seat is one paid spot on a team or organization's plan — one person's access. When a company buys software "for ten seats," it's paying for ten people to use it, and it can usually move a seat from someone who left to someone new. It's the unit a business buys and budgets in, rather than everyone purchasing their own copy.
It's how the B2B side works: an organization buys a block of seats for its team, assigns them to staff, and treats finishing the course (and the certificate) as part of the job. Knowing the word helps you read any team or business pricing.
see alsoCertificateClaude Code Desktop
Everything you do by clicking on Desktop has a command-line twin in the Power Track. You never need the right column — it's here for the curious.
| What you want | On Desktop (no code) | Command line (Power Track) |
|---|---|---|
| Open a folder to work in | Drag it onto Claude, or File → Open | cd ~/folder |
| Ask Claude to do something | Type it in the chat, in plain words | claude "organize this folder" |
| Review proposed changes | Read the visual diff in the preview pane | claude diff |
| Approve a change | Click Accept on the permission prompt | claude accept |
| Undo the last change | Click Undo — originals are kept | git restore . |
| Start a new task cleanly | Open a new chat, or clear the current one | /clear |
| Give Claude more context | Drag extra files into the chat | /add-dir ../assets |
The essentials
Slash commands
Type a forward slash to run a saved, named action instead of writing the whole request.
Examples & tips →Plan mode
Ask Claude to think and propose a plan first — without touching a single file — so you approve the approach before any work happens.
Examples & tips →CLAUDE.md & memory
Give Claude standing context about your project and preferences so you stop re-explaining them every conversation.
Examples & tips →Checkpoints & rewind
Claude saves a snapshot before each change, so you can rewind to how things were if an edit goes wrong.
Examples & tips →Effort & fast mode
Two dials — how hard Claude thinks about a task, and how fast it works — so you can match the model to the job.
Examples & tips →Context & the window
The model only "sees" what's in its context window. Managing what's in it — and clearing it when it's stale — is the skill that separates good sessions from frustrating ones.
Examples & tips →Model selection
Claude comes in four tiers — Haiku, Sonnet, Opus, and Fable. Switch with /model to match the brain to the job.
Examples & tips →Many Claudes at once
Subagents
Hand a self-contained task to a second Claude with its own fresh context, so your main conversation stays focused.
Examples & tips →Workflows & agent teams
One request fans out into many Claudes working in parallel — each on a piece — then their results are gathered back together.
Examples & tips →Agent view & background work
One screen for every Claude you have running — start jobs, send them to the background, and get pinged when one needs you.
Examples & tips →Monitor (watch & react)
Claude watches a running command's output live and reacts the moment something happens — an error, a passing test, a new log line.
Examples & tips →Make it yours
Skills
A reusable file of know-how that Claude pulls in automatically when it's relevant — your team's playbook, taught once.
Examples & tips →Permissions & allowlists
You approve what Claude does. Tune how often it asks — from 'check with me on everything' to 'the safe stuff is pre-approved'.
Examples & tips →Auto mode
A smart middle ground for permissions — safe actions run on their own, risky ones still stop for your yes.
Examples & tips →Connect & automate
Connect your tools (MCP)
A standard plug that lets Claude read and act in your other tools — GitHub, Slack, your database, Google Drive, and more.
Examples & tips →Hooks
Small commands that fire automatically at set moments — like running your formatter every time Claude saves a file.
Examples & tips →Plugins
A bundle of skills, commands, hooks, and connectors you install in one step — a pre-packed setup someone else already figured out.
Examples & tips →Scheduled agents & loops
Hand Claude a job and a time, and it runs itself — every morning, every Monday, or on a repeating loop — without you in the room.
Examples & tips →Computer use
Claude can open real apps, click through their screens, and check the result with its own eyes — not just edit files.
Examples & tips →Cloud code review
A fleet of bug-hunting agents reviews your changes in the cloud and sends the findings back to you.
Examples & tips →In the Claude app
Artifacts
A live side panel where Claude builds something you can see, use, and tweak — a document, a chart, a working mini-app — right next to the chat.
Examples & tips →Projects
A workspace that holds related chats plus shared knowledge — files, a style guide, custom instructions — so every chat in it starts already in context.
Examples & tips →Deep Research
Claude runs many web searches, reads the sources, and hands you a structured, cited report — instead of one quick answer.
Examples & tips →Extended Thinking
A mode where Claude reasons step-by-step for longer before answering — more accurate on hard math, tricky logic, and planning.
Examples & tips →Connectors
Secure links that let Claude reach into apps you already use — Google Drive, Gmail, Calendar, Notion, GitHub, Slack — to read and act on your real data.
Examples & tips →