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Claude Code Not Working? 9 Common Issues and How to Fix Them

Claude Code Not Working? 9 Common Issues and How to Fix Them

Updated: May 2026 · How we test tools →

Claude Code is powerful, but it's not immune to frustrating moments. Authentication failures, rate limit walls, hanging sessions, broken extensions — they all happen. This guide covers the nine most common Claude Code problems, how to fix them fast, and when the issues are a signal to try something else entirely.

Quick Diagnosis: What's Your Problem?

Symptom Most likely cause Jump to
"Usage limit reached" message Rate limit on Pro plan Issue #1
npm install fails Node.js version or permissions Issue #2
Authentication / API key error Expired session or wrong key Issue #3
Claude Code hangs / no response Network or large context overload Issue #4
Edits the wrong files Context window confusion Issue #5
VS Code extension not connecting Extension config mismatch Issue #6
JetBrains extension broken Plugin version incompatibility Issue #7
Very slow responses High server load or large context Issue #8
Git errors / permission denied File permission or Git config issue Issue #9

Issue #1: "Usage Limit Reached" — Rate Limits on the Pro Plan

What's happening: You've hit Claude Code's usage cap for the Pro plan ($20/month). Anthropic doesn't publish exact limits, but most developers hit them after 3–5 hours of continuous agentic work or after large multi-file refactors.

Quick fixes:

  • Wait 2–3 hours for your usage window to reset
  • Break large tasks into smaller scoped sessions to spread usage
  • Avoid loading your entire codebase into context when only a subset is needed

If it keeps happening: This is the most common reason developers upgrade to Claude Code Max ($100–200/month) or switch tools entirely. See our full Claude Code Pricing breakdown → to decide if upgrading makes sense for your usage pattern.

Alternatives if you don't want to pay more:

  • Aider — free CLI agent, pay only for raw API tokens with no usage caps
  • Gemini CLI — 1,000 free requests per day with Gemini 2.5 Pro

Issue #2: Installation Fails — npm install Errors

What's happening: Claude Code requires Node.js 18+ and npm. Errors here are almost always caused by an outdated Node version, permission problems on macOS/Linux, or a corrupted npm cache.

Quick fixes:

# Check your Node version — must be 18+
node --version

# If outdated, update via nvm
nvm install 20
nvm use 20

# Fix npm permission errors on macOS/Linux
npm install -g @anthropic-ai/claude-code --prefix ~/.local

# Clear npm cache if install keeps failing
npm cache clean --force
npm install -g @anthropic-ai/claude-code

Windows users: Claude Code is primarily designed for macOS and Linux. On Windows, use WSL2 for the most reliable experience.

Issue #3: Authentication Errors — API Key or Login Failures

What's happening: Claude Code authentication can fail when your Anthropic session has expired, your API key has been rotated, or there's a mismatch between your account type and Claude Code access.

Quick fixes:

# Re-authenticate Claude Code
claude /logout
claude /login

# Verify your API key is valid at:
# console.anthropic.com/settings/keys

Important: Claude Code requires an active Claude.ai Pro subscription ($20/month minimum). A free Claude account will not grant access. See Claude Code Pricing → for full plan details.

Issue #4: Claude Code Hangs or Stops Responding

What's happening: Sessions can hang due to network interruptions during a long agentic run, context window overflow on very large codebases, or Anthropic API latency during peak hours.

Quick fixes:

# Press Ctrl+C to interrupt the current session safely

# Check Anthropic's API status
# https://status.anthropic.com

# Reduce context size
claude "refactor only src/auth/login.ts, ignore everything else"

# Exclude irrelevant directories
echo "node_modules/\ndist/\n.git/" > .claudeignore

If it's a recurring issue on large codebases: Aider's repo map approach dynamically loads only relevant files rather than the full codebase, which can be more stable on very large projects.

Issue #5: Claude Code Edits the Wrong Files

What's happening: When working in a large codebase without clear scope, Claude Code can make changes to files you didn't intend — especially when similarly named files exist in multiple directories.

Quick fixes:

  • Always specify the exact file or directory: "Only modify files inside src/components/auth/"
  • Use .claudeignore to exclude irrelevant directories
  • Start sessions with a scope-setting message: "We're working exclusively on the payment module. Do not touch anything outside /src/payments/"
  • Review proposed diffs before confirming changes

Issue #6: VS Code Extension Not Connecting

What's happening: The Claude Code VS Code extension fails to connect when there's a version mismatch between the extension and your CLI, or when the CLI isn't found in your PATH.

Quick fixes:

  1. Update CLI: npm update -g @anthropic-ai/claude-code
  2. Restart VS Code completely after CLI updates
  3. Open VS Code terminal and run which claude to verify PATH
  4. Disable and re-enable the extension in the Extensions panel
  5. Check View → Output → Claude Code for specific error messages

If the extension keeps failing: Cursor is a VS Code fork with AI built into the editor core rather than as an extension — tighter integration, fewer connection issues. See Claude Code vs Cursor →.

Issue #7: JetBrains Extension Not Working

What's happening: The Claude Code JetBrains plugin can break after IDE updates, or when the plugin version lags behind the CLI version.

Quick fixes:

  1. Update the plugin: Settings → Plugins → Claude Code → Update
  2. Verify your JetBrains IDE meets the minimum version requirement
  3. Invalidate caches: File → Invalidate Caches → Invalidate and Restart
  4. If on a JetBrains EAP build, switch to the stable release

Note: For JetBrains users who need more stability, GitHub Copilot's JetBrains plugin is more polished and better maintained. See Claude Code vs GitHub Copilot →.

Issue #8: Very Slow Responses

What's happening: Slow responses are almost always caused by Anthropic API load during peak hours (typically 14:00–20:00 UTC), large context windows taking time to process, or your internet connection.

Quick fixes:

  • Check status.anthropic.com for active incidents
  • Reduce context via .claudeignore — exclude dist/, build/, *.lock files
  • Run intensive tasks outside of peak usage hours

Backup option: Gemini CLI with Gemini 2.5 Pro often has lower latency during Anthropic peak hours — worth keeping for time-sensitive work.

Issue #9: Git Errors — Permission Denied or Commit Failures

What's happening: Claude Code interacts with Git to read context and commit changes. Errors appear when Git isn't configured, or Claude Code is run outside of a Git repository.

Quick fixes:

# Configure Git if not already done
git config --global user.email "you@example.com"
git config --global user.name "Your Name"

# Verify you're inside a Git repo
git status

# Fix permission errors on Claude Code-created files
chmod -R u+rw .

When Issues Are a Sign to Switch Tools

Some problems aren't fixable — they're structural limitations of Claude Code:

You keep hitting rate limits → Upgrade to Max ($100–200/month) or switch to Aider where you pay only raw API tokens with no caps. See Claude Code vs Aider →.

You miss autocomplete → Claude Code has no inline autocomplete by design. Cursor or GitHub Copilot are the right tools if you want AI suggestions as you type.

You need stable JetBrains support → GitHub Copilot's JetBrains plugin is significantly more mature.

You want local models → Claude Code sends all code to Anthropic's servers. Aider with Ollama runs entirely offline.

Browse all Claude Code alternatives → across AI IDEs, CLI Agents, IDE Extensions, and AI App Builders.

FAQ

Why does Claude Code keep stopping mid-task? Most likely a rate limit pause on the Pro plan. Check for the "Usage limit reached" message. If not, check your network and status.anthropic.com.

Does Claude Code work on Windows? Use WSL2 for a supported experience. Native Windows support is limited.

How do I update Claude Code? Run npm update -g @anthropic-ai/claude-code. Check your version with claude --version.

Can I use Claude Code without internet? No. For offline AI coding, Aider with local models via Ollama is the main alternative.

Claude Code worked yesterday but not today — what changed? Check status.anthropic.com first. Also run npm update to ensure you're on the latest CLI version.

See all Claude Code alternatives → or read our Claude Code Pricing guide → to understand plan limits.

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