Claude Code Explained: How Anthropic’s Terminal-First Coding Agent Works Across CLI Sessions, IDE Integrations, Shared Context, Hooks, Memory, and Long-Running Development Workflows

Claude Code is best understood not as a conventional autocomplete plugin inside an editor, but as an agentic coding environment with a terminal-first core that can also attach to IDE workflows and expose the same underlying work through richer visual controls.

Anthropic’s own documentation says Claude Code reads the codebase, edits files, runs commands, and integrates with development tools, while the quickstart and overview consistently present the CLI as the central operating surface even though the product also appears in VS Code, JetBrains, desktop, web, Slack, and CI environments.

That framing matters because it explains why Claude Code behaves differently from both ordinary chat assistants and traditional IDE copilots, since the product is organized around a live coding agent session that can act inside a repository and then surface that same session in the editor rather than duplicating it as a separate assistant brain.

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Claude Code is an agentic coding environment rather than a simple code chat tool.

Anthropic’s overview says Claude Code reads your codebase, edits files, runs commands, and integrates with development tools, which means the product is defined by action and workflow execution rather than by text generation alone.

That is a significant distinction because a normal coding chatbot mainly comments on code, while Claude Code is designed to inspect the repository, modify files, invoke shell actions, and continue reasoning based on the results of those actions.

The product therefore makes the most sense as a combination of model reasoning, file-system access, shell execution, session continuity, and workflow controls, all wrapped inside one agentic development environment.

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The Simplest Way to Understand Claude Code

Layer	What It Does
Model layer	Reasons about code, plans work, and analyzes repository state
Tool layer	Reads files, edits code, and runs commands
Session layer	Preserves history, resumability, and evolving task context
Workflow layer	Supports hooks, settings, skills, and repeated engineering patterns

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The terminal is the main Claude Code surface and the place where its agent behavior is most direct.

Anthropic’s quickstart explicitly covers the terminal CLI first and notes that Claude Code is also available on the web, desktop, VS Code, JetBrains, Slack, and CI systems, which shows that the product starts from the shell rather than from the sidebar of an editor.

This matters because the CLI is the natural environment where repository traversal, shell execution, command output, git operations, and file edits can all happen in one place without the product needing to imitate terminal behavior from inside a graphical wrapper.

That is why Claude Code is more accurately described as terminal-native than editor-native, since the shell is where the product’s file, command, and repository powers are exposed most directly and where its agentic character is easiest to see.

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Terminal workflows are built around repository work, command execution, and iterative problem solving.

Anthropic’s common workflows documentation presents Claude Code as a tool for exploring unfamiliar codebases, debugging, refactoring, writing tests, creating pull requests, and managing sessions, which are all tasks that benefit from a live shell environment rather than a narrow inline completion box.

The CLI reference also documents interactive use, flags, slash commands, checkpointing, and other command-line primitives, which reinforces that Claude Code in the terminal is intended to function as an active working agent inside a repository rather than as a passive answer window.

This gives the terminal workflow three clear characteristics, namely interactive coding sessions, command-driven execution, and tool-mediated development work in which Claude can inspect files, run commands, and then continue the same task with updated evidence from the environment.

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What the Terminal Workflow Is Designed to Support

Terminal Behavior	Why It Matters
Interactive sessions	Lets Claude stay inside an evolving coding task
Command execution	Connects reasoning to real repository actions
File editing	Turns analysis into direct implementation
Repository exploration	Helps Claude navigate unfamiliar codebases
Session management	Makes longer engineering arcs more practical

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The IDE workflow is an extension of the same Claude Code session rather than a separate assistant product.

Anthropic’s IDE integration documentation for VS Code emphasizes inline diffs, plan review, @-mentions, and keyboard shortcuts, while the broader product and SDK materials show that Claude Code maintains remembered files, prior analysis, and conversation history that can be resumed or forked later.

That matters because it shows the editor interface is not a separate reasoning engine with its own independent context, but a richer surface for viewing and steering the same underlying Claude Code work.

The correct mental model is therefore not that Claude Code has one terminal assistant and another IDE assistant, but that one coding agent can be surfaced in multiple places, with the editor adding review and supervision affordances on top of the same continuing session.

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The IDE adds visual review, easier context injection, and more comfortable supervision.

Anthropic’s VS Code documentation highlights inline diffs, @-mentions, and plan review, while the 2025 product update on more autonomous Claude Code also describes a richer sidebar experience and stronger support for longer development tasks in the IDE.

This matters because the terminal is efficient for action, but the editor is often better for inspection, comparison, selective acceptance, and broader visual control over what the agent is doing.

So the IDE is best understood as the place where Claude Code becomes easier to supervise and review, while the terminal remains the place where its underlying agent behavior feels most native and operational.

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What the IDE Adds Beyond the Terminal

IDE Feature	What It Changes
Inline diffs	Makes edits easier to inspect visually
Plan review	Lets developers supervise proposed work before accepting it
@-mentions	Makes it easier to inject code and context from the editor
Sidebar controls	Improves visibility during longer autonomous work

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Session continuity is one of the key ideas that connects terminal and IDE workflows.

Anthropic’s Agent SDK overview says Claude remembers files read, analysis done, and conversation history, and that users can resume sessions later or fork them into new directions, while the Claude Code changelog also notes support for /resume behavior inside Claude Code.

This matters because Claude Code is not designed around disposable one-off prompts.

It is designed around continuing work, where previous investigation, code understanding, and repository interactions remain relevant to the next step rather than being lost between surfaces or turns.

That persistent session model is one of the strongest reasons Claude Code feels more like a workspace agent than a chatbot, because the same debugging or implementation effort can continue across time and across interfaces instead of being rebuilt from scratch whenever the user changes surface.

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Claude Code is configurable like a development environment rather than only promptable like a chatbot.

Anthropic’s settings documentation says Claude Code can be configured with global settings, project settings, and environment variables, and that /config opens a settings interface in the interactive REPL, which shows that the product is expected to be tuned structurally rather than only steered conversationally.

The hooks guide goes even further by describing hooks as shell commands, HTTP endpoints, or LLM prompts that run automatically at key lifecycle moments, including examples such as formatting files after edits, blocking commands before execution, sending notifications, and injecting context at session start.

Anthropic’s engineering best-practices article explicitly contrasts advisory instructions with deterministic hooks, which makes the product look less like a simple assistant and more like a programmable coding environment whose behavior can be governed at multiple levels.

That is a crucial part of how Claude Code works in practice, because the user is not limited to writing better prompts and can instead shape the environment itself through settings, lifecycle automation, and enforced workflow rules.

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Claude Code Has More Than One Control Layer

Control Layer	What It Does
Prompts and conversation	Guide the current task in real time
Settings	Define broader user or project behavior
Hooks	Enforce automatic actions at key lifecycle moments
Environment variables	Shape runtime behavior and configuration

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Memory helps Claude Code carry project context into both terminal and IDE sessions.

Anthropic’s memory documentation says Claude Code has two complementary memory systems that are loaded at the start of every conversation, and that Claude treats them as context rather than as hard configuration.

This matters because it helps explain why Claude Code can feel aware of project conventions and repository context before the next interaction even begins.

The agent is not always starting from zero and is instead beginning with memory already loaded into the session environment.

That memory behavior applies across terminal and IDE use because those are only different surfaces for the same broader Claude Code environment, which is why files such as CLAUDE.md and other project-context conventions matter so much in the Claude Code ecosystem.

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Skills and slash commands make Claude Code extensible in ways that fit real engineering teams.

Anthropic’s slash-command documentation and related Claude Code materials show that the product has a reusable command layer, while the broader ecosystem around skills extends Claude’s capabilities through reusable definitions and workflow packaging.

This matters because it means Claude Code is not limited to ad hoc natural-language prompting for every recurring task.

Teams can encode recurring engineering patterns into reusable commands or structured capability layers, which helps the agent behave more like a repeatable workflow system than like a fresh assistant conversation every time.

That kind of extensibility is especially natural in the terminal, where reusable commands already fit the culture of shell-centric development, but it also improves the IDE experience because the same underlying agent can invoke those established workflows while the editor provides the review and control surface.

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Anthropic is clearly pushing Claude Code toward longer and more autonomous development loops.

Anthropic’s 2025 update on making Claude Code work more autonomously says the product can now handle longer and more complex development tasks in the terminal and IDE, and it frames the VS Code extension, checkpoints, and terminal UX improvements as part of that move toward more capable autonomous development workflows.

That matters because it shows the product direction clearly.

Claude Code is not evolving toward smaller or narrower interactions.

It is evolving toward longer-running engineering loops where the same agent does more work over more time and where terminal and IDE surfaces are both strengthened to support that autonomy.

This is why the terminal-versus-IDE question is slightly misleading if treated as a rivalry.

The deeper story is that Anthropic is reinforcing both surfaces around one increasingly autonomous agent core, with the terminal optimized for action and the IDE optimized for monitoring, review, and steering.

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The Product Direction Is Toward More Autonomous Development Work

Product Direction	What Anthropic’s Docs Suggest
Longer tasks	Claude Code is being shaped for more sustained work
More autonomy	The agent is expected to do more between user interventions
Better supervision	IDE surfaces are improving to help monitor that autonomy

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Even cost behavior reflects the fact that Claude Code is session-based and persistent.

Anthropic’s cost-management documentation says Claude Code consumes a small amount of background tokens even when idle because conversation summarization for resumability and some command processing still continue in the background.

That is a small operational detail, but it is conceptually revealing because it confirms that Claude Code is maintaining a real session model rather than functioning as a purely stateless prompt tool.

The product therefore behaves less like a fresh request processor and more like a living workspace in which preserving resumability and continuity is part of how the system works under the hood.

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The most accurate conclusion is that Claude Code is a terminal-native coding agent with IDE-attached supervision and control.

Anthropic’s current documentation supports a very clear synthesis, because the CLI is presented as the main operating surface, the IDE integrations add inline diffs, plan review, and sidebar controls on top of the same session model, and the deeper product behavior is shaped by resumable sessions, project memory, settings, hooks, reusable commands, and a clear push toward longer and more autonomous development work.

That means the best way to understand Claude Code is not as an editor copilot that happens to have shell access and not as a shell chatbot that happens to know code, but as an agentic development environment whose natural home is the terminal and whose IDE presence is a richer way to supervise, review, and guide the same underlying work.

The cleanest summary is therefore that Claude Code works through one persistent coding-agent model expressed across two main surfaces, with the terminal optimized for action and repository work and the IDE optimized for visibility, review, and interactive control over the same continuing development session.

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