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settings/reference.md 2026-07-21 15:00 UTC to 2026-07-22 01:00 UTC

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2026
Thu 2 06:57 Sat 4 20:00 Wed 22 01:00 Thu 30 16:57

Settings

Reference

Environment variables

Paths and auth

Variable Default Description
GROK_HOME ~/.grok Home for config, auth, sessions, skills, plugins, and logs.
XAI_API_KEY — API key when not using browser/session login (CI and headless).

Models and updates

Variable Default Description
GROK_DEFAULT_MODEL catalog / config Session default model (same idea as -m / --model).
GROK_WEB_SEARCH_MODEL built-in Model used by the web_search tool.
GROK_MODELS_BASE_URL — Custom inference base URL; model list from {base}/models.
GROK_MODELS_LIST_URL {GROK_MODELS_BASE_URL}/models Override model-list URL when it differs from the default.
GROK_XAI_API_BASE_URL https://api.x.ai/v1 xAI API base for API-key auth.
GROK_DISABLE_AUTOUPDATER unset (updates allowed) If set, suppress auto-updater for this process (CI/containers).

Tools, sandbox, and features

Variable Default Description
GROK_SANDBOX off Sandbox profile: off, workspace, read-only, strict (or a custom profile name). Same as --sandbox.
GROK_SANDBOX_AUTO_ALLOW_BASH 0 Auto-allow bash inside an active sandbox (1/0).
GROK_RESPECT_GITIGNORE use config if unset Force gitignore filtering for search/read tools (1/0); overrides [tools] respect_gitignore.
GROK_WEB_FETCH 0 Enable the web_fetch tool (1/0). Off by default for security.
GROK_WEB_FETCH_PROXY — Egress proxy URL for web_fetch.
GROK_MEMORY 0 Enable cross-session memory (1/0).
GROK_SUBAGENTS 0 Enable subagents / the task tool (1/0).
GROK_AGENT grok-build Built-in agent name, profile, or absolute path to an agent definition.
GROK_SHOW_THINKING_BLOCKS 0 Show reasoning/thinking blocks in the TUI (1/0).
GROK_WRITE_FILE 1 Disable the write tool with 0 (read-only sessions).
GROK_TOOL_SEARCH 1 On-demand MCP tool discovery for large toolsets (1/0).
GROK_LSP_TOOLS 0 Enable the LSP code-intel tool (1/0).

MCP, logging, and proxy

Variable Default Description
GROK_MCP_STARTUP_TIMEOUT_SECS 30 Global MCP startup handshake timeout in seconds. Per-server startup_timeout_sec still wins.
MCP_TIMEOUT same stack Claude-compatible MCP startup timeout in milliseconds (checked before GROK_MCP_STARTUP_TIMEOUT_SECS).
GROK_LOG_FILE — Write logs to this path (useful when the TUI captures stderr).
RUST_LOG — Log filter for GROK_LOG_FILE and headless stderr (for example debug).
GROK_CRASH_HANDLER 0 On panic, write a report under $GROK_HOME/crash/ (1/0).
HTTPS_PROXY / HTTP_PROXY / NO_PROXY system Standard HTTP(S) proxy variables for outbound traffic.

Cursor / Claude compatibility scanners

All default on (true / 1 or false / 0):

Variable Description
GROK_CURSOR_SKILLS_ENABLED Scan Cursor skills directories.
GROK_CURSOR_RULES_ENABLED Scan .cursor/rules/.
GROK_CURSOR_AGENTS_ENABLED Scan Cursor agent definitions.
GROK_CURSOR_MCPS_ENABLED Scan Cursor mcp.json.
GROK_CURSOR_HOOKS_ENABLED Scan Cursor hooks.
GROK_CLAUDE_SKILLS_ENABLED Scan Claude skills.
GROK_CLAUDE_RULES_ENABLED Scan Claude rules.
GROK_CLAUDE_AGENTS_ENABLED Scan CLAUDE.md / CLAUDE.local.md.
GROK_CLAUDE_MCPS_ENABLED Scan Claude MCP config.
GROK_CLAUDE_HOOKS_ENABLED Scan Claude hooks.

TOML Values

Project .grok/config.toml only contributes [mcp_servers], [plugins], and [permission]. Other sections belong in user config (~/.grok/config.toml or $GROK_HOME/config.toml).

[models]

Setting Values / default Description
default model id (for example "grok-build") Model used for new sessions.
web_search model id Model used by the client web_search tool.
default_reasoning_effort effort level if supported Default reasoning effort for the default model.
session_summary model id Model used for session summaries.
image_description model id Model used for image description.
extra_headers map Headers applied to every model (per-model keys win).
temperature / top_p / max_completion_tokens numbers Global sampling defaults.
max_retries number Global inference retry default.
stream_tool_calls true / false Global tool-call streaming request shape (some BYOK endpoints need false).
allowed_models glob list Restrict model picker / default / -m selection.
hidden_models id list Hide from the picker (still usable via -m).
disabled_models id list Remove from the catalog (wins over hidden).

[model.<id>]

Custom / BYOK models (OpenAI-compatible or Anthropic Messages). Prefer env_key over hardcoding api_key.

Setting Values / default Description
model string Model id sent to the API.
base_url URL Provider endpoint.
name string Label in the model picker.
description string Optional description.
api_key string Inline API key (prefer env_key).
env_key env var name Environment variable holding the API key.
api_backend chat_completions responses
temperature / top_p / max_completion_tokens numbers Sampling.
context_window tokens Context window size (drives auto-compact timing).
extra_headers map Per-request headers.
supports_backend_search true / false Whether the endpoint supports Grok-hosted server-side search tools.
supports_reasoning_effort / reasoning_effort bool / effort Reasoning controls when supported.
stream_tool_calls true / false Per-model tool-call streaming.
max_retries / inference_idle_timeout_secs numbers Reliability.

[mcp_servers.<name>]

String fields such as url, command, args, env, and headers support ${VAR} expansion. Headers may also use {{session_id}}.

stdio

Setting Values / default Description
command string Executable (for example npx).
args string array Arguments.
env map Process environment.
cwd path Working directory for the process.

HTTP / remote

Setting Values / default Description
url URL HTTP/SSE MCP endpoint.
headers map Request headers.
bearer_token_env_var env var name Inject Authorization: Bearer from an environment variable.

Common

Setting Values / default Description
enabled true Enable or disable the server.
startup_timeout_sec 30 Startup handshake timeout (seconds).
tool_timeout_sec 6000 Default per-tool-call timeout (seconds).
tool_timeouts map name → seconds Per-tool timeout overrides.

[tools] and [toolset.*]

Setting Section Values / default Description
respect_gitignore [tools] true / false (default false) When true, search and read tools skip gitignored files.
file_toolset [toolset] standard (default) hashline
timeout_secs [toolset.bash] seconds (default 120) Foreground bash command timeout.
output_byte_limit [toolset.bash] bytes (default 20000) Max captured bash output.
max_timeout_secs [toolset.bash] seconds (default 36000) Cap on model-requested foreground timeouts.
auto_background_on_timeout [toolset.bash] true / false (default true) Auto-background the command on timeout.
proxy_endpoint [toolset.web_fetch] URL Egress proxy for web_fetch.
allowed_domains [toolset.web_fetch] string array Domain allowlist override for web_fetch.

[sandbox] (config.toml)

Setting Values / default Description
profile off (default) workspace
auto_allow_bash true / false (default false) Skip bash permission prompts when a sandbox profile is active.

sandbox.toml custom profiles

Define custom profiles in ~/.grok/sandbox.toml (user) or .grok/sandbox.toml (project). Activate with [sandbox] profile = "…" in config.toml, --sandbox, or GROK_SANDBOX. Built-in names (off, workspace, read-only, strict, devbox) cannot be redefined as custom profiles.

[profiles.project]
extends = "workspace"
restrict_network = false
read_only = ["/data"]
read_write = ["/tmp/scratch"]
# Kernel-enforced deny (read + write/rename). Entries with *, ?, or [ are globs.
deny = ["/data/shared-secrets", "**/.env", "**/*.pem"]
Setting Values / default Description
extends workspace (default if omitted) devbox
restrict_network true / false Restrict network access (Linux seccomp when enforced).
read_only path list Additional read-only paths.
read_write path list Additional read-write paths.
deny path or glob list Kernel-enforced deny for read and write/rename. An entry is a glob if it contains *, ?, or [ (for example **/.env, **/*.pem).

A non-empty deny list is enforced at the kernel level when the sandbox can be applied. On Linux, read-deny requires bubblewrap. Operator guide: Sandbox. Managed pins: Enterprise Deployments.

[session], [cli], and [hints]

Setting Section Values / default Description
auto_compact_threshold_percent [session] 0–100 (default 85) Auto-compact when context usage reaches this percent.
load_envrc [session] true / false (default true) Inject .envrc variables into bash.
auto_update [cli] true / false (default on when unset) Check for CLI updates on launch.
channel [cli] stable alpha
show_tips [cli] true / false Startup tips.
new_session_worktree_mode [hints] ask always
fork_worktree_mode [hints] ask always

[permission]

Project-scoped and user-scoped. Evaluation order: deny > ask > allow.

Setting Values Description
allow / deny / ask rule string arrays Compact rules, for example Bash(git *), Read(src/**), Edit(**/*.rs), MCPTool(server__*).
rules array of { action, tool, pattern? } Verbose form. action: allow

[features], [subagents], and [memory]

Setting Section Values / default Description
web_fetch [features] true / false Enable the web_fetch tool.
lsp_tools [features] true / false (default off) Expose the LSP tool.
write_file [features] true / false (default on) Enable the write tool.
tool_search [features] true / false (default on) MCP tool search / discovery.
enabled [subagents] true / false Subagent / task tool master switch.
toggle [subagents.toggle] map of subagent → bool Enable or disable individual subagent types.
models [subagents.models] map of subagent → model id Per-subagent model routing.
enabled [memory] true / false (default off) Cross-session memory master switch.

[skills], [plugins], and [compat.*]

Setting Section Values Description
paths [skills] / [plugins] path lists Extra skill or plugin directories.
disabled [skills] / [plugins] name lists Discover but do not activate.
enabled [plugins] name lists Explicitly enable plugins (project plugins may default off).
skills / rules / agents / mcps / hooks [compat.cursor] / [compat.claude] true / false (default true) Scan Cursor or Claude harness directories.