Feature & Disable Flags

This section contains toggles for enabling or disabling features. Most are boolean (1/true enables, 0/false disables).

Enable Flags

Variable	Default	Effect	Example
`CLAUDE_CODE_ENABLE_CFC`	false	Enable CFC (Claude For Code) feature	`export CLAUDE_CODE_ENABLE_CFC=1`
`CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING`	false	Enable fine-grained streaming for tool use responses	`export CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING=1`
`CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION`	false	Enable prompt suggestion feature	`export CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION=1`
`CLAUDE_CODE_ENABLE_SDK_FILE_CHECKPOINTING`	false	Enable file checkpointing in SDK mode	`export CLAUDE_CODE_ENABLE_SDK_FILE_CHECKPOINTING=1`
`CLAUDE_CODE_ENABLE_TASKS`	false	Enable the task tracking system	`export CLAUDE_CODE_ENABLE_TASKS=1`
`CLAUDE_CODE_ENABLE_TELEMETRY`	true	Enable telemetry data collection	`export CLAUDE_CODE_ENABLE_TELEMETRY=0`
`CLAUDE_CODE_ENABLE_TOKEN_USAGE_ATTACHMENT`	false	Enable attaching token usage info to responses	`export CLAUDE_CODE_ENABLE_TOKEN_USAGE_ATTACHMENT=1`
`CLAUDE_CODE_ENABLE_XAA`	false	Enable XAA (Cross-App Auth) support for MCP servers via OIDC IdP	`export CLAUDE_CODE_ENABLE_XAA=1`
`CLAUDE_CODE_ENHANCED_TELEMETRY_BETA`	false	Enable enhanced telemetry beta features	`export CLAUDE_CODE_ENHANCED_TELEMETRY_BETA=1`
`ENABLE_ENHANCED_TELEMETRY_BETA`	false	Alternative flag for enhanced telemetry beta	`export ENABLE_ENHANCED_TELEMETRY_BETA=1`
`CLAUDE_ENABLE_STREAM_WATCHDOG`	false	Enable watchdog for stream health monitoring	`export CLAUDE_ENABLE_STREAM_WATCHDOG=1`
`EMBEDDED_SEARCH_TOOLS`	false	Enable embedded search tools	`export EMBEDDED_SEARCH_TOOLS=1`
`ENABLE_TOOL_SEARCH`	false	Enable the tool search/deferred tool loading feature	`export ENABLE_TOOL_SEARCH=1`
`ENABLE_CLAUDEAI_MCP_SERVERS`	false	Enable Claude.ai MCP servers	`export ENABLE_CLAUDEAI_MCP_SERVERS=1`
`ENABLE_MCP_LARGE_OUTPUT_FILES`	false	Enable large output file support for MCP tools	`export ENABLE_MCP_LARGE_OUTPUT_FILES=1`
`ENABLE_BETA_TRACING_DETAILED`	false	Enable detailed beta tracing (requires BETA_TRACING_ENDPOINT)	`export ENABLE_BETA_TRACING_DETAILED=1`

Disable Flags

Variable	Default	Effect	Example
`CLAUDE_CODE_DISABLE_1M_CONTEXT`	false	Disable 1M token context window support	`export CLAUDE_CODE_DISABLE_1M_CONTEXT=1`
`CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING`	false	Disable adaptive thinking mode; fall back to fixed budget	`export CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING=1`
`CLAUDE_CODE_DISABLE_ADVISOR_TOOL`	false	Disable the advisor tool	`export CLAUDE_CODE_DISABLE_ADVISOR_TOOL=1`
`CLAUDE_CODE_DISABLE_ATTACHMENTS`	false	Disable file attachments in messages	`export CLAUDE_CODE_DISABLE_ATTACHMENTS=1`
`CLAUDE_CODE_DISABLE_AUTO_MEMORY`	false	Disable automatic memory system (set to ‘0’ to force-enable)	`export CLAUDE_CODE_DISABLE_AUTO_MEMORY=1`
`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`	false	Disable background task execution	`export CLAUDE_CODE_DISABLE_BACKGROUND_TASKS=1`
`CLAUDE_CODE_DISABLE_CLAUDE_API_SKILL`	false	Disable the Claude API skill	`export CLAUDE_CODE_DISABLE_CLAUDE_API_SKILL=1`
`CLAUDE_CODE_DISABLE_CLAUDE_MDS`	false	Disable loading of CLAUDE.md instruction files	`export CLAUDE_CODE_DISABLE_CLAUDE_MDS=1`
`CLAUDE_CODE_DISABLE_CRON`	false	Disable cron/scheduled task functionality	`export CLAUDE_CODE_DISABLE_CRON=1`
`CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS`	false	Disable experimental beta features	`export CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1`
`CLAUDE_CODE_DISABLE_FAST_MODE`	false	Disable fast mode toggle	`export CLAUDE_CODE_DISABLE_FAST_MODE=1`
`CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY`	false	Disable feedback survey prompts	`export CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY=1`
`CLAUDE_CODE_DISABLE_FILE_CHECKPOINTING`	false	Disable file checkpointing for undo/restore	`export CLAUDE_CODE_DISABLE_FILE_CHECKPOINTING=1`
`CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS`	false	Disable git-related instructions in system prompt	`export CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS=1`
`CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP`	false	Disable legacy model name remapping	`export CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP=1`
`CLAUDE_CODE_DISABLE_MOUSE`	false	Disable mouse input in the terminal UI	`export CLAUDE_CODE_DISABLE_MOUSE=1`
`CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC`	false	Disable non-essential network traffic (feature flags, telemetry)	`export CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1`
`CLAUDE_CODE_DISABLE_NONSTREAMING_FALLBACK`	false	Disable fallback to non-streaming API mode	`export CLAUDE_CODE_DISABLE_NONSTREAMING_FALLBACK=1`
`CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL`	false	Disable automatic installation of official marketplace plugins	`export CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL=1`
`CLAUDE_CODE_DISABLE_POLICY_SKILLS`	false	Disable policy-based skill loading	`export CLAUDE_CODE_DISABLE_POLICY_SKILLS=1`
`CLAUDE_CODE_DISABLE_PRECOMPACT_SKIP`	false	Disable skipping of pre-compaction optimization	`export CLAUDE_CODE_DISABLE_PRECOMPACT_SKIP=1`
`CLAUDE_CODE_DISABLE_TERMINAL_TITLE`	false	Disable setting the terminal title	`export CLAUDE_CODE_DISABLE_TERMINAL_TITLE=1`
`CLAUDE_CODE_DISABLE_THINKING`	false	Disable extended thinking entirely	`export CLAUDE_CODE_DISABLE_THINKING=1`
`CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL`	false	Disable virtual scrolling in the UI	`export CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL=1`
`DISABLE_AUTOUPDATER`	false	Disable the automatic update checker	`export DISABLE_AUTOUPDATER=1`
`DISABLE_AUTO_COMPACT`	false	Disable automatic context compaction	`export DISABLE_AUTO_COMPACT=1`
`DISABLE_COMPACT`	false	Disable the /compact command entirely	`export DISABLE_COMPACT=1`
`DISABLE_COST_WARNINGS`	false	Disable cost warning notifications	`export DISABLE_COST_WARNINGS=1`
`DISABLE_ERROR_REPORTING`	false	Disable error reporting to Anthropic	`export DISABLE_ERROR_REPORTING=1`
`DISABLE_INTERLEAVED_THINKING`	false	Disable interleaved thinking in responses	`export DISABLE_INTERLEAVED_THINKING=1`
`DISABLE_PROMPT_CACHING`	false	Disable prompt caching for all models	`export DISABLE_PROMPT_CACHING=1`
`DISABLE_PROMPT_CACHING_HAIKU`	false	Disable prompt caching specifically for Haiku	`export DISABLE_PROMPT_CACHING_HAIKU=1`
`DISABLE_PROMPT_CACHING_OPUS`	false	Disable prompt caching specifically for Opus	`export DISABLE_PROMPT_CACHING_OPUS=1`
`DISABLE_PROMPT_CACHING_SONNET`	false	Disable prompt caching specifically for Sonnet	`export DISABLE_PROMPT_CACHING_SONNET=1`
`DISABLE_TELEMETRY`	false	Disable all telemetry data collection	`export DISABLE_TELEMETRY=1`
`DO_NOT_TRACK`	false	Disable telemetry when set to 1 (standard DNT convention)	`export DO_NOT_TRACK=1`

Command Disablers

Variable	Default	Effect	Example
`DISABLE_BUG_COMMAND`	false	Disable the /bug command	`export DISABLE_BUG_COMMAND=1`
`DISABLE_DOCTOR_COMMAND`	false	Disable the /doctor command	`export DISABLE_DOCTOR_COMMAND=1`
`DISABLE_EXTRA_USAGE_COMMAND`	false	Disable the /usage command	`export DISABLE_EXTRA_USAGE_COMMAND=1`
`DISABLE_FEEDBACK_COMMAND`	false	Disable the /feedback command	`export DISABLE_FEEDBACK_COMMAND=1`
`DISABLE_INSTALLATION_CHECKS`	false	Disable installation verification checks	`export DISABLE_INSTALLATION_CHECKS=1`
`DISABLE_INSTALL_GITHUB_APP_COMMAND`	false	Disable the install GitHub app command	`export DISABLE_INSTALL_GITHUB_APP_COMMAND=1`
`DISABLE_LOGIN_COMMAND`	false	Disable the /login command	`export DISABLE_LOGIN_COMMAND=1`
`DISABLE_LOGOUT_COMMAND`	false	Disable the /logout command	`export DISABLE_LOGOUT_COMMAND=1`
`DISABLE_UPGRADE_COMMAND`	false	Disable the /upgrade command	`export DISABLE_UPGRADE_COMMAND=1`

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