Claude Code

Environment Commands

Configure Claude Code through environment variables. Learn available settings for API keys, proxies, and behavioral customization.

9 commands

Pro Tips

Set ANTHROPIC_API_KEY in your environment for API authentication.

Use environment variables for team-consistent settings across different machines.

Common Mistakes

Never commit API keys to version control. Use environment variables or secret managers.

Commands

Set API key

$ export ANTHROPIC_API_KEY=sk-...

Set Anthropic API key for direct access.

Use AWS Bedrock

$ export CLAUDE_CODE_USE_BEDROCK=1

Use Claude via AWS Bedrock.

Use Google Vertex AI

$ export CLAUDE_CODE_USE_VERTEX=1

Use Claude via Google Vertex AI.

Disable auto-updates

$ export DISABLE_AUTOUPDATER=1

Prevent automatic updates.

Disable telemetry

$ export DISABLE_TELEMETRY=1

Opt out of analytics collection.

Set extended thinking tokens

$ export MAX_THINKING_TOKENS=10000

Increase thinking token budget.

Set max output tokens

$ export CLAUDE_CODE_MAX_OUTPUT_TOKENS=4000

Set maximum output token limit.

Set bash timeout

$ export BASH_DEFAULT_TIMEOUT_MS=30000

Set default timeout for bash commands.

Set MCP timeout

$ export MCP_TIMEOUT=5000

Set MCP server startup timeout.