updated readme

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| Item | Reason | Where It Belongs |
|------|--------|-----------------|
| Skill `user-invocable` field | Skill-specific frontmatter | [claude-skills-frontmatter.md](claude-skills-frontmatter.md) |
| Skill `${CLAUDE_SESSION_ID}` variable | Skill-specific template variable | [claude-skills-frontmatter.md](claude-skills-frontmatter.md) |
| Skill `user-invocable` field | Skill-specific frontmatter | [claude-skills-frontmatter.md](../best-practice/claude-skills-frontmatter.md) |
| Skill `${CLAUDE_SESSION_ID}` variable | Skill-specific template variable | [claude-skills-frontmatter.md](../best-practice/claude-skills-frontmatter.md) |
| Agent `memory` frontmatter | Already covered in depth | [claude-agent-memory.md](../claude-agent-memory.md) |
| claude.ai MCP connectors | Product feature, not settings | N/A |
| `chat:newline` keybinding | Keybindings reference, not settings | [claude-commands.md](claude-commands.md) (Keyboard Shortcuts section) |
| `chat:newline` keybinding | Keybindings reference, not settings | [claude-commands.md](../best-practice/claude-commands.md) (Keyboard Shortcuts section) |
---
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# Claude Code Commands Reference
A comprehensive reference of all available slash commands in Claude Code's interactive mode.
<table width="100%">
<tr>
<td><a href="../">← Back to Claude Code Best Practice</a></td>
<td align="right"><img src="../!/claude-jumping.svg" alt="Claude" width="60" /></td>
</tr>
</table>
## Table of Contents
1. [Session Management](#session-management)
2. [Context & Cost](#context--cost)
3. [Model & Planning](#model--planning)
4. [Project & Memory](#project--memory)
5. [Configuration](#configuration)
6. [Extensions & Integrations](#extensions--integrations)
7. [Diagnostics & Debugging](#diagnostics--debugging)
8. [Import / Export](#import--export)
9. [Authentication](#authentication)
10. [Input Modes & Prefixes](#input-modes--prefixes)
11. [Dynamic Commands](#dynamic-commands)
12. [CLI Flags](#cli-flags)
13. [Keyboard Shortcuts](#keyboard-shortcuts)
---
## Session Management
| Command | Description |
|---------|-------------|
| `/clear` | Clear conversation history and start fresh |
| `/compact [instructions]` | Compress conversation to free context window. Optional instructions focus the compaction on specific topics |
| `/rename <name>` | Rename the current session for easier identification |
| `/resume [session]` | Resume a previous conversation by ID or name, or open the session picker |
| `/rewind` | Rewind the conversation and/or code to an earlier point, or summarize from a selected message |
| `/fork` | Fork the current conversation into a new session |
| `/teleport` | Resume a remote session from claude.ai (subscribers only) |
| `/exit` | Exit the REPL |
---
## Context & Cost
| Command | Description |
|---------|-------------|
| `/context` | Visualize current context usage as a colored grid with token counts and percentages |
| `/cost` | Show token usage statistics and spending for the current session |
| `/usage` | Show plan usage limits and rate limit status (subscription plans only) |
| `/stats` | Visualize daily usage, session history, streaks, and model preferences. Supports date range filtering |
---
## Model & Planning
| Command | Description |
|---------|-------------|
| `/model` | Switch models (haiku, sonnet, opus) and adjust Opus 4.6 effort level with arrow keys |
| `/plan` | Enter read-only planning mode where Claude suggests approaches without making changes |
| `/fast` | Toggle fast mode — same Opus 4.6 model with faster output |
---
## Project & Memory
| Command | Description |
|---------|-------------|
| `/init` | Initialize a new project with CLAUDE.md guide |
| `/memory` | View and edit CLAUDE.md memory files (user, project, and local scope) |
---
## Configuration
| Command | Description |
|---------|-------------|
| `/config` | Open the interactive Settings interface with search functionality |
| `/permissions` | View or update tool permissions |
| `/theme` | Change the color theme |
| `/vim` | Enable vim-style editing mode |
| `/terminal-setup` | Enable shift+enter for newlines in IDE terminals, Apple Terminal, Warp, and Alacritty |
| `/keybindings` | Customize keyboard shortcuts per context, create chord sequences |
| `/statusline` | Set up Claude Code's status line UI |
| `/sandbox` | Configure sandboxing with dependency status |
---
## Extensions & Integrations
| Command | Description |
|---------|-------------|
| `/agents` | Manage custom subagents — view, create, edit, delete |
| `/skills` | View available skills and their descriptions |
| `/hooks` | Interactive interface to manage hooks |
| `/mcp` | Manage MCP server connections — add, enable, list, get info, OAuth authentication |
| `/plugin` | Manage plugins — install, uninstall, enable, disable, browse marketplaces |
| `/ide` | Connect to IDE integration |
---
## Diagnostics & Debugging
| Command | Description |
|---------|-------------|
| `/doctor` | Check the health of your Claude Code installation. Detects unreachable permissions, config issues, and updates |
| `/debug [description]` | Troubleshoot the current session by reading the session debug log |
| `/tasks` | List and manage background tasks |
| `/todos` | List current TODO items |
| `/help` | Show all available slash commands and usage help |
| `/feedback` | Generate a GitHub issue URL for reporting bugs or feedback |
---
## Import / Export
| Command | Description |
|---------|-------------|
| `/copy` | Copy the last assistant response to clipboard |
| `/export [filename]` | Export the current conversation to a file or clipboard |
---
## Authentication
| Command | Description |
|---------|-------------|
| `/login` | Authenticate with Claude Code via OAuth |
| `/logout` | Log out from Claude Code |
---
## Input Modes & Prefixes
These are special prefixes you can type at the prompt, not slash commands per se:
| Prefix | Description |
|--------|-------------|
| `/` | Trigger command or skill autocomplete |
| `!` | Bash mode — run shell commands directly and add output to conversation |
| `@` | File path mention — trigger file path autocomplete for context |
---
## Dynamic Commands
These commands are not built-in but are discovered at runtime from your configuration:
### MCP Prompts
MCP servers can expose prompts that appear as commands:
```
/mcp__<server-name>__<prompt-name>
```
### Plugin Commands
Installed plugins can provide their own commands, namespaced by plugin name:
```
/plugin-name:command-name
```
### Custom Skills
Skills defined in `.claude/skills/` appear as invocable commands:
```
/skill-name
```
---
## CLI Flags
These flags are used when launching Claude Code from the terminal, not as interactive commands:
| Flag | Description |
|------|-------------|
| `--doctor` | Run diagnostics from the command line |
| `--debug` | Launch in debug mode with hook execution details |
| `--resume` | Resume most recent session |
| `--plan` | Start in plan mode |
| `--init` | Initialize repository with CLAUDE.md setup |
| `--init-only` | Run repository initialization only, then exit |
| `--maintenance` | Run repository maintenance operations |
| `--from-pr <url>` | Resume a session linked to a specific GitHub PR |
---
## Keyboard Shortcuts
### Navigation & Control
| Shortcut | Description |
|----------|-------------|
| `Ctrl+C` | Cancel current input or generation |
| `Ctrl+D` | Exit Claude Code session |
| `Ctrl+L` | Clear terminal screen |
| `Ctrl+R` | Reverse search command history |
| `Ctrl+O` | Toggle verbose output |
| `Esc` + `Esc` | Rewind or summarize |
### Model & Mode Switching
| Shortcut | Description |
|----------|-------------|
| `Option+P` / `Alt+P` | Switch model |
| `Option+T` / `Alt+T` | Toggle extended thinking |
| `Shift+Tab` / `Alt+M` | Toggle permission modes |
| `Ctrl+B` | Background running tasks |
| `Ctrl+T` | Toggle task list |
### Text Editing
| Shortcut | Description |
|----------|-------------|
| `Ctrl+G` | Open prompt in default text editor |
| `Ctrl+V` / `Cmd+V` | Paste image from clipboard |
| `Ctrl+K` | Delete to end of line |
| `Ctrl+U` | Delete entire line |
| `Ctrl+Y` | Paste deleted text |
| `Alt+Y` | Cycle paste history |
### Multiline Input
| Shortcut | Description |
|----------|-------------|
| `\` + `Enter` | Quick escape for multiline |
| `Option+Enter` | macOS default multiline |
| `Shift+Enter` | Multiline (iTerm2, WezTerm, Ghostty, Kitty) |
| `Ctrl+J` | Line feed character for multiline |
---
## Sources
- [Claude Code Interactive Mode](https://code.claude.com/docs/en/interactive-mode)
- [Claude Code CLI Reference](https://code.claude.com/docs/en/cli-reference)
- [Claude Code Slash Commands](https://code.claude.com/docs/en/slash-commands)
- [Claude Code CHANGELOG](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md)
- [Claude Code Common Workflows](https://code.claude.com/docs/en/common-workflows)
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# Claude Code Settings Reference
A comprehensive guide to all available configuration options in Claude Code's `settings.json` files. As of February 2026, Claude Code exposes **38 settings** and **84 environment variables** (use the `"env"` field in `settings.json` to avoid wrapper scripts).
<table width="100%">
<tr>
<td><a href="../">← Back to Claude Code Best Practice</a></td>
<td align="right"><img src="../!/claude-jumping.svg" alt="Claude" width="60" /></td>
</tr>
</table>
## Table of Contents
1. [Settings Hierarchy](#settings-hierarchy)
2. [Core Configuration](#core-configuration)
3. [Permissions](#permissions)
4. [Hooks](#hooks)
5. [MCP Servers](#mcp-servers)
6. [Sandbox](#sandbox)
7. [Plugins](#plugins)
8. [Model Configuration](#model-configuration)
9. [Display & UX](#display--ux)
10. [AWS & Cloud Credentials](#aws--cloud-credentials)
11. [Environment Variables](#environment-variables-via-env)
12. [Useful Commands](#useful-commands)
---
## Settings Hierarchy
Claude Code settings use a 5-level user-writable override chain plus an enforced policy layer:
| Priority | Location | Scope | Version Control | Purpose |
|----------|----------|-------|-----------------|---------|
| 1 | Command line arguments | Session | N/A | Single-session overrides |
| 2 | `.claude/settings.local.json` | Project | No (git-ignored) | Personal project-specific |
| 3 | `.claude/settings.json` | Project | Yes (committed) | Team-shared settings |
| 4 | `~/.claude/settings.local.json` | User | N/A | Personal global overrides |
| 5 | `~/.claude/settings.json` | User | N/A | Global personal defaults |
**Policy layer**: `managed-settings.json` is organization-enforced and cannot be overridden by local settings.
**Important**:
- `deny` rules have highest safety precedence and cannot be overridden by lower-priority allow/ask rules.
- Managed settings may lock or override local behavior even if local files specify different values.
---
## Core Configuration
### General Settings
| Key | Type | Default | Description |
|-----|------|---------|-------------|
| `model` | string | `"default"` | Override default model. Accepts aliases (`sonnet`, `opus`, `haiku`) or full model IDs |
| `agent` | string | - | Set the default agent for the main conversation. Value is the agent name from `.claude/agents/`. Also available via `--agent` CLI flag |
| `language` | string | `"english"` | Claude's preferred response language |
| `cleanupPeriodDays` | number | `30` | Sessions inactive longer than this are deleted at startup |
| `autoUpdatesChannel` | string | `"latest"` | Release channel: `"stable"` or `"latest"` |
| `alwaysThinkingEnabled` | boolean | `false` | Enable extended thinking by default for all sessions |
| `skipWebFetchPreflight` | boolean | `false` | Skip WebFetch blocklist check before fetching URLs |
**Example:**
```json
{
"model": "opus",
"agent": "code-reviewer",
"language": "japanese",
"cleanupPeriodDays": 60,
"autoUpdatesChannel": "stable",
"alwaysThinkingEnabled": true
}
```
### Plans Directory
Store plan files in a custom location relative to project root.
| Key | Type | Default | Description |
|-----|------|---------|-------------|
| `plansDirectory` | string | `.claude/plans/` | Directory where `/plan` outputs are stored |
**Example:**
```json
{
"plansDirectory": "./my-plans"
}
```
**Use Case:** Useful for organizing planning artifacts separately from Claude's internal files, or for keeping plans in a shared team location.
### Attribution Settings
Customize attribution messages for git commits and pull requests.
| Key | Type | Default | Description |
|-----|------|---------|-------------|
| `attribution.commit` | string | Co-authored-by | Git commit attribution (supports trailers) |
| `attribution.pr` | string | Generated message | Pull request description attribution |
| `includeCoAuthoredBy` | boolean | `true` | **DEPRECATED** - Use `attribution` instead |
**Example:**
```json
{
"attribution": {
"commit": "Generated with AI\n\nCo-Authored-By: Claude <noreply@anthropic.com>",
"pr": "Generated with Claude Code"
}
}
```
**Note:** Set to empty string (`""`) to hide attribution entirely.
### Authentication Helpers
Scripts for dynamic authentication token generation.
| Key | Type | Description |
|-----|------|-------------|
| `apiKeyHelper` | string | Shell script path that outputs auth token (sent as `X-Api-Key` header) |
| `forceLoginMethod` | string | Restrict login to `"claudeai"` or `"console"` accounts |
| `forceLoginOrgUUID` | string | UUID to automatically select organization during login |
**Example:**
```json
{
"apiKeyHelper": "/bin/generate_temp_api_key.sh",
"forceLoginMethod": "console",
"forceLoginOrgUUID": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}
```
### Company Announcements
Display custom announcements to users at startup (cycled randomly).
| Key | Type | Description |
|-----|------|-------------|
| `companyAnnouncements` | array | Array of strings displayed at startup |
**Example:**
```json
{
"companyAnnouncements": [
"Welcome to Acme Corp!",
"Remember to run tests before committing!",
"Check the wiki for coding standards"
]
}
```
---
## Permissions
Control what tools and operations Claude can perform.
### Permission Structure
```json
{
"permissions": {
"allow": [],
"ask": [],
"deny": [],
"additionalDirectories": [],
"defaultMode": "acceptEdits",
"disableBypassPermissionsMode": "disable"
}
}
```
### Permission Keys
| Key | Type | Description |
|-----|------|-------------|
| `permissions.allow` | array | Rules allowing tool use without prompting |
| `permissions.ask` | array | Rules requiring user confirmation |
| `permissions.deny` | array | Rules blocking tool use (highest precedence) |
| `permissions.additionalDirectories` | array | Extra directories Claude can access |
| `permissions.defaultMode` | string | Default permission mode |
| `permissions.disableBypassPermissionsMode` | string | Prevent bypass mode activation |
### Permission Modes
| Mode | Behavior |
|------|----------|
| `"default"` | Standard permission checking with prompts |
| `"acceptEdits"` | Auto-accept file edits without asking |
| `"askEdits"` | Ask before every operation |
| `"viewOnly"` | Read-only mode, no modifications |
| `"bypassPermissions"` | Skip all permission checks (dangerous) |
| `"plan"` | Read-only exploration mode |
### Tool Permission Syntax
| Tool | Syntax | Examples |
|------|--------|----------|
| `Bash` | `Bash(command pattern)` | `Bash(npm run *)`, `Bash(* install)`, `Bash(git * main)` |
| `Read` | `Read(path pattern)` | `Read(.env)`, `Read(./secrets/**)` |
| `Edit` | `Edit(path pattern)` | `Edit(src/**)`, `Edit(*.ts)` |
| `Write` | `Write(path pattern)` | `Write(*.md)`, `Write(./docs/**)` |
| `NotebookEdit` | `NotebookEdit(pattern)` | `NotebookEdit(*)` |
| `WebFetch` | `WebFetch(domain:pattern)` | `WebFetch(domain:example.com)` |
| `WebSearch` | `WebSearch` | Global web search |
| `Task` | `Task(agent-name)` | `Task(Explore)`, `Task(my-agent)` |
| `Skill` | `Skill(skill-name)` | `Skill(weather-fetcher)` |
| `MCP` | `mcp__server__tool` | `mcp__memory__*`, `mcp__github__*` |
**Bash wildcard notes:**
- `*` can appear at **any position**: prefix (`Bash(* install)`), suffix (`Bash(npm *)`), or middle (`Bash(git * main)`)
- `Bash(*)` is treated as equivalent to `Bash` (matches all bash commands)
- Permission rules support output redirections: `Bash(python:*)` matches `python script.py > output.txt`
**Example:**
```json
{
"permissions": {
"allow": [
"Edit(*)",
"Write(*)",
"Bash(npm run *)",
"Bash(git *)",
"WebFetch(domain:*)",
"mcp__*"
],
"ask": [
"Bash(rm *)",
"Bash(git push *)"
],
"deny": [
"Read(.env)",
"Read(./secrets/**)",
"Bash(curl *)"
],
"additionalDirectories": ["../shared-libs/"]
}
}
```
---
## Hooks
Execute custom shell commands at various points in Claude Code's lifecycle.
### Hook Events (16 total)
| Event | When Fired | Matcher Support | Common Use Cases |
|-------|------------|-----------------|------------------|
| `SessionStart` | New or resumed session | No | Load context, set environment |
| `SessionEnd` | Session terminates | No | Cleanup, logging |
| `UserPromptSubmit` | User submits prompt | No | Validate input, add context |
| `PreToolUse` | Before tool execution | Yes | Validate commands, modify inputs |
| `PostToolUse` | After tool succeeds | Yes | Run linters, verify output |
| `PostToolUseFailure` | After tool fails | Yes | Log failures, recovery |
| `PermissionRequest` | Permission dialog appears | Yes | Auto-approve/deny patterns |
| `Notification` | Notification sent | Yes | Sound alerts, logging |
| `Stop` | Claude finishes responding | No | Block/continue decisions |
| `SubagentStart` | Subagent spawned | Yes | Per-agent setup |
| `SubagentStop` | Subagent completes | Yes | Cleanup, validation |
| `PreCompact` | Before context compaction | Yes | Backup, logging |
| `Setup` | Repository init (`--init`, `--init-only`, `--maintenance`) | Yes | One-time setup |
| `TeammateIdle` | Agent Teams teammate goes idle | Yes | Team orchestration, routing |
| `TaskCompleted` | A tracked task is completed | Yes | Progress automation, notifications |
| `ConfigChange` | Configuration files change during session | Yes | Enterprise security auditing, blocking settings changes |
### Hook Configuration Structure
```json
{
"hooks": {
"EventName": [
{
"matcher": "ToolPattern",
"hooks": [
{
"type": "command",
"command": "script.sh",
"timeout": 60000,
"once": true
}
]
}
]
},
"disableAllHooks": false,
"allowManagedHooksOnly": false
}
```
### Hook Properties
| Property | Type | Description |
|----------|------|-------------|
| `matcher` | string | Regex pattern to match tool/event (optional) |
| `type` | string | `"command"` or `"prompt"` |
| `command` | string | Shell command to execute (for `type: "command"`) |
| `prompt` | string | LLM prompt for evaluation (for `type: "prompt"`) |
| `timeout` | number | Timeout in milliseconds |
| `once` | boolean | Run only once per session |
| `model` | string | Custom model for prompt-based stop hooks (for `type: "prompt"`) |
### Hook Matcher Patterns
| Pattern | Matches |
|---------|---------|
| `"Bash"` | Exact match only |
| `"Edit\|Write"` | Multiple tools with regex OR |
| `"mcp__.*"` | All MCP tools |
| `"mcp__memory__.*"` | Specific MCP server tools |
| `"*"` or `""` | All tools |
### Hook Exit Codes
| Exit Code | Behavior |
|-----------|----------|
| `0` | Success, continue |
| `1` | Error (logged, continues) |
| `2` | Block the operation |
### Environment Variables in Hooks
| Variable | Description |
|----------|-------------|
| `${CLAUDE_PROJECT_DIR}` | Project root directory |
| `CLAUDE_TOOL_NAME` | Current tool name |
| `CLAUDE_TOOL_INPUT` | Tool input (JSON) |
| `CLAUDE_TOOL_OUTPUT` | Tool output (PostToolUse only) |
**PreToolUse/PostToolUse Input Fields:**
| Field | Description |
|-------|-------------|
| `tool_use_id` | Unique identifier for this specific tool invocation |
**Stop/SubagentStop Input Fields:**
The `Stop` and `SubagentStop` hooks receive additional fields in their JSON input:
| Field | Description |
|-------|-------------|
| `last_assistant_message` | The final assistant response text (avoids parsing transcript files) |
| `agent_id` | Agent identifier (SubagentStop only) |
| `agent_transcript_path` | Path to agent's transcript file (SubagentStop only) |
**Example:**
```json
{
"hooks": {
"PreToolUse": [
{
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "python3 ${CLAUDE_PROJECT_DIR}/.claude/hooks/validate.py",
"timeout": 5000
}
]
}
],
"SessionStart": [
{
"hooks": [
{
"type": "command",
"command": "echo 'Session started!'",
"timeout": 1000,
"once": true
}
]
}
]
},
"disableAllHooks": false
}
```
---
## MCP Servers
Configure Model Context Protocol servers for extended capabilities.
### MCP Settings
| Key | Type | Scope | Description |
|-----|------|-------|-------------|
| `enableAllProjectMcpServers` | boolean | Any | Auto-approve all `.mcp.json` servers |
| `enabledMcpjsonServers` | array | Any | Allowlist specific server names |
| `disabledMcpjsonServers` | array | Any | Blocklist specific server names |
| `allowedMcpServers` | array | Managed only | Allowlist with name/command/URL matching |
| `deniedMcpServers` | array | Managed only | Blocklist with matching |
### MCP Server Matching (Managed Settings)
```json
{
"allowedMcpServers": [
{ "serverName": "github" },
{ "serverCommand": "npx @modelcontextprotocol/*" },
{ "serverUrl": "https://mcp.company.com/*" }
],
"deniedMcpServers": [
{ "serverName": "dangerous-server" }
]
}
```
**Example:**
```json
{
"enableAllProjectMcpServers": true,
"enabledMcpjsonServers": ["memory", "github", "filesystem"],
"disabledMcpjsonServers": ["experimental-server"]
}
```
---
## Sandbox
Configure bash command sandboxing for security.
### Sandbox Settings
| Key | Type | Default | Description |
|-----|------|---------|-------------|
| `sandbox.enabled` | boolean | `false` | Enable bash sandboxing |
| `sandbox.autoAllowBashIfSandboxed` | boolean | `true` | Auto-approve bash when sandboxed |
| `sandbox.excludedCommands` | array | `[]` | Commands to run outside sandbox |
| `sandbox.allowUnsandboxedCommands` | boolean | `true` | Allow `dangerouslyDisableSandbox` |
| `sandbox.ignoreViolations` | object | `{}` | Map of command patterns to path arrays — suppress violation warnings |
| `sandbox.enableWeakerNestedSandbox` | boolean | `false` | Weaker sandbox for Docker (reduces security) |
| `sandbox.network.allowUnixSockets` | array | `[]` | Specific Unix socket paths accessible in sandbox |
| `sandbox.network.allowAllUnixSockets` | boolean | `false` | Allow all Unix sockets (overrides allowUnixSockets) |
| `sandbox.network.allowLocalBinding` | boolean | `false` | Allow binding to localhost ports (macOS) |
| `sandbox.network.allowedDomains` | array | `[]` | Network domain allowlist for sandbox |
| `sandbox.network.deniedDomains` | array | `[]` | Network domain denylist for sandbox |
| `sandbox.network.httpProxyPort` | number | - | HTTP proxy port 1-65535 (custom proxy) |
| `sandbox.network.socksProxyPort` | number | - | SOCKS5 proxy port 1-65535 (custom proxy) |
**Example:**
```json
{
"sandbox": {
"enabled": true,
"autoAllowBashIfSandboxed": true,
"excludedCommands": ["git", "docker", "gh"],
"allowUnsandboxedCommands": false,
"network": {
"allowUnixSockets": ["/var/run/docker.sock"],
"allowLocalBinding": true
}
}
}
```
---
## Plugins
Configure Claude Code plugins and marketplaces.
### Plugin Settings
| Key | Type | Scope | Description |
|-----|------|-------|-------------|
| `enabledPlugins` | object | Any | Enable/disable specific plugins |
| `extraKnownMarketplaces` | object | Any | Add custom plugin marketplaces |
| `strictKnownMarketplaces` | array | Managed only | Allowlist of permitted marketplaces |
| `skippedMarketplaces` | array | Any | Marketplaces user declined to install |
| `skippedPlugins` | array | Any | Plugins user declined to install |
| `pluginConfigs` | object | Any | Per-plugin MCP server configs (keyed by `plugin@marketplace`) |
**Example:**
```json
{
"enabledPlugins": {
"formatter@acme-tools": true,
"deployer@acme-tools": true,
"experimental@acme-tools": false
},
"extraKnownMarketplaces": {
"acme-tools": {
"source": {
"source": "github",
"repo": "acme-corp/claude-plugins"
}
}
}
}
```
---
## Model Configuration
### Model Aliases
| Alias | Description |
|-------|-------------|
| `"default"` | Recommended for your account type |
| `"sonnet"` | Latest Sonnet model (Claude Sonnet 4.6) |
| `"opus"` | Latest Opus model (Claude Opus 4.6) |
| `"haiku"` | Fast Haiku model |
| `"sonnet[1m]"` | Sonnet with 1M token context |
| `"opusplan"` | Opus for planning, Sonnet for execution |
**Example:**
```json
{
"model": "opus"
}
```
### Effort Level (Opus 4.6)
When Opus 4.6 is selected, the `/model` command exposes an **effort level** control that adjusts how much reasoning the model applies per response. Use the ← → arrow keys in the `/model` UI to cycle through effort levels.
| Effort Level | Description |
|-------------|-------------|
| High (default) | Full reasoning depth, best for complex tasks |
| Medium | Balanced reasoning, good for everyday tasks |
| Low | Minimal reasoning, fastest responses |
**How to use:**
1. Run `/model` in Claude Code
2. Select **Default (recommended)** — Opus 4.6
3. Use **← →** arrow keys to adjust the effort level
4. The setting applies to the current session and future sessions
**Note:** Effort level is only available for Opus 4.6. Other models (Sonnet, Haiku) do not expose this control.
### Model Environment Variables
Configure via `env` key:
```json
{
"env": {
"ANTHROPIC_MODEL": "sonnet",
"ANTHROPIC_DEFAULT_HAIKU_MODEL": "custom-haiku-model",
"ANTHROPIC_DEFAULT_SONNET_MODEL": "custom-sonnet-model",
"ANTHROPIC_DEFAULT_OPUS_MODEL": "custom-opus-model",
"CLAUDE_CODE_SUBAGENT_MODEL": "haiku",
"MAX_THINKING_TOKENS": "10000"
}
}
```
---
## Display & UX
### Display Settings
| Key | Type | Default | Description |
|-----|------|---------|-------------|
| `statusLine` | object | - | Custom status line configuration |
| `outputStyle` | string | `"default"` | Output style (e.g., `"Explanatory"`) |
| `spinnerTipsEnabled` | boolean | `true` | Show tips while waiting |
| `spinnerVerbs` | object | - | Custom spinner verbs with `mode` ("append" or "replace") and `verbs` array |
| `spinnerTipsOverride` | object | - | Custom spinner tips with `tips` (string array) and optional `excludeDefault` (boolean) |
| `terminalProgressBarEnabled` | boolean | `true` | Show progress bar in terminal |
| `showTurnDuration` | boolean | `true` | Show turn duration messages |
| `respectGitignore` | boolean | `true` | Respect .gitignore in file picker |
### Status Line Configuration
```json
{
"statusLine": {
"type": "command",
"command": "~/.claude/statusline.sh",
"padding": 0
}
}
```
**Status Line Input Fields:**
The status line command receives a JSON object on stdin with these notable fields:
| Field | Description |
|-------|-------------|
| `workspace.added_dirs` | Directories added via `/add-dir` |
| `context_window.used_percentage` | Context window usage percentage |
| `context_window.remaining_percentage` | Context window remaining percentage |
| `current_usage` | Current context window token count |
| `exceeds_200k_tokens` | Whether context exceeds 200k tokens |
### File Suggestion Configuration
```json
{
"fileSuggestion": {
"type": "command",
"command": "~/.claude/file-suggestion.sh"
},
"respectGitignore": true
}
```
**Example:**
```json
{
"statusLine": {
"type": "command",
"command": "git branch --show-current 2>/dev/null || echo 'no-branch'"
},
"spinnerTipsEnabled": true,
"spinnerVerbs": {
"mode": "replace",
"verbs": ["Cooking", "Brewing", "Crafting", "Conjuring"]
},
"spinnerTipsOverride": {
"tips": ["Use /compact at ~50% context", "Start with plan mode for complex tasks"],
"excludeDefault": true
},
"terminalProgressBarEnabled": true,
"showTurnDuration": false
}
```
---
## AWS & Cloud Credentials
### AWS Settings
| Key | Type | Description |
|-----|------|-------------|
| `awsAuthRefresh` | string | Script to refresh AWS auth (modifies `.aws` dir) |
| `awsCredentialExport` | string | Script outputting JSON with AWS credentials |
**Example:**
```json
{
"awsAuthRefresh": "aws sso login --profile myprofile",
"awsCredentialExport": "/bin/generate_aws_grant.sh"
}
```
### OpenTelemetry
| Key | Type | Description |
|-----|------|-------------|
| `otelHeadersHelper` | string | Script to generate dynamic OpenTelemetry headers |
**Example:**
```json
{
"otelHeadersHelper": "/bin/generate_otel_headers.sh"
}
```
---
## Environment Variables (via `env`)
Set environment variables for all Claude Code sessions.
```json
{
"env": {
"ANTHROPIC_API_KEY": "...",
"NODE_ENV": "development",
"DEBUG": "true"
}
}
```
### Common Environment Variables
| Variable | Description |
|----------|-------------|
| `ANTHROPIC_API_KEY` | API key for authentication |
| `ANTHROPIC_AUTH_TOKEN` | OAuth token |
| `ANTHROPIC_BASE_URL` | Custom API endpoint |
| `CLAUDE_CODE_USE_BEDROCK` | Use AWS Bedrock (`1` to enable) |
| `CLAUDE_CODE_USE_VERTEX` | Use Google Vertex AI (`1` to enable) |
| `CLAUDE_CODE_USE_FOUNDRY` | Use Microsoft Foundry (`1` to enable) |
| `CLAUDE_CODE_ENABLE_TELEMETRY` | Enable/disable telemetry (`0` or `1`) |
| `DISABLE_ERROR_REPORTING` | Disable error reporting (`1` to disable) |
| `DISABLE_TELEMETRY` | Disable telemetry (`1` to disable) |
| `MCP_TIMEOUT` | MCP startup timeout in ms (default: 10000) |
| `MAX_MCP_OUTPUT_TOKENS` | Max MCP output tokens (default: 50000) |
| `BASH_MAX_TIMEOUT_MS` | Bash command timeout |
| `BASH_MAX_OUTPUT_LENGTH` | Max bash output length |
| `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE` | Auto-compact threshold percentage (1-100). Default is ~95%. Set lower (e.g., `50`) to trigger compaction earlier. Values above 95% have no effect. Use `/context` to monitor current usage. Example: `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE=50 claude` |
| `CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR` | Keep cwd between bash calls (`1` to enable) |
| `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` | Disable background tasks (`1` to disable) |
| `ENABLE_TOOL_SEARCH` | MCP tool search threshold (e.g., `auto:5`) |
| `DISABLE_PROMPT_CACHING` | Disable all prompt caching (`1` to disable) |
| `DISABLE_PROMPT_CACHING_HAIKU` | Disable Haiku prompt caching |
| `DISABLE_PROMPT_CACHING_SONNET` | Disable Sonnet prompt caching |
| `DISABLE_PROMPT_CACHING_OPUS` | Disable Opus prompt caching |
| `CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS` | Disable experimental beta features (`1` to disable) |
| `CLAUDE_CODE_SHELL` | Override automatic shell detection |
| `CLAUDE_CODE_FILE_READ_MAX_OUTPUT_TOKENS` | Override default file read token limit |
| `CLAUDE_CODE_ENABLE_TASKS` | Set to `false` to disable new task system |
| `CLAUDE_CODE_EXIT_AFTER_STOP_DELAY` | Auto-exit SDK mode after idle duration (ms) |
---
## Useful Commands
| Command | Description |
|---------|-------------|
| `/model` | Switch models and adjust Opus 4.6 effort level |
| `/config` | Interactive configuration UI |
| `/memory` | View/edit all memory files |
| `/agents` | Manage subagents |
| `/mcp` | Manage MCP servers |
| `/hooks` | View configured hooks |
| `/plugin` | Manage plugins |
| `/keybindings` | Configure custom keyboard shortcuts |
| `/skills` | View and manage skills |
| `/permissions` | View and manage permission rules |
| `--doctor` | Diagnose configuration issues |
| `--debug` | Debug mode with hook execution details |
---
## Quick Reference: Complete Example
```json
{
"model": "sonnet",
"agent": "code-reviewer",
"language": "english",
"cleanupPeriodDays": 30,
"autoUpdatesChannel": "stable",
"alwaysThinkingEnabled": true,
"plansDirectory": "./plans",
"permissions": {
"allow": [
"Edit(*)",
"Write(*)",
"Bash(npm run *)",
"Bash(git *)",
"WebFetch(domain:*)",
"mcp__*"
],
"deny": [
"Read(.env)",
"Read(./secrets/**)"
],
"additionalDirectories": ["../shared/"]
},
"enableAllProjectMcpServers": true,
"hooks": {
"PreToolUse": [
{
"hooks": [
{
"type": "command",
"command": "echo 'Tool starting'",
"timeout": 5000
}
]
}
]
},
"disableAllHooks": false,
"sandbox": {
"enabled": true,
"excludedCommands": ["git", "docker"]
},
"attribution": {
"commit": "Generated with Claude Code",
"pr": ""
},
"statusLine": {
"type": "command",
"command": "git branch --show-current"
},
"spinnerTipsEnabled": true,
"spinnerTipsOverride": {
"tips": ["Custom tip 1", "Custom tip 2"],
"excludeDefault": false
},
"showTurnDuration": false,
"env": {
"NODE_ENV": "development"
}
}
```
---
## Sources
- [Claude Code Settings Documentation](https://code.claude.com/docs/en/settings)
- [Claude Code Settings JSON Schema](https://www.schemastore.org/claude-code-settings.json)
- [Claude Code Configuration Guide](https://claudelog.com/configuration/)
- [Claude Code GitHub Settings Examples](https://github.com/feiskyer/claude-code-settings)
- [Eesel AI - Developer's Guide to settings.json](https://www.eesel.ai/blog/settings-json-claude-code)
- [Shipyard - Claude Code CLI Cheatsheet](https://shipyard.build/blog/claude-code-cheat-sheet/)
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# Claude Code: Skills Frontmatter Reference
Quick-reference tables for defining skills in `.claude/skills/<name>/SKILL.md`.
<table width="100%">
<tr>
<td><a href="../">← Back to Claude Code Best Practice</a></td>
<td align="right"><img src="../!/claude-jumping.svg" alt="Claude" width="60" /></td>
</tr>
</table>
---
## Frontmatter Fields
All fields are optional. Only `description` is recommended so Claude knows when to use the skill.
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `name` | string | No | Display name and `/slash-command`. Lowercase letters, numbers, hyphens only (max 64 chars). Defaults to directory name if omitted |
| `description` | string | Recommended | What the skill does and when to use it. Claude uses this for auto-discovery. Falls back to first paragraph of content if omitted |
| `argument-hint` | string | No | Hint shown during autocomplete (e.g., `[issue-number]`, `[filename] [format]`) |
| `disable-model-invocation` | boolean | No | Set `true` to prevent Claude from auto-loading this skill. User can still invoke via `/name`. Default: `false` |
| `user-invocable` | boolean | No | Set `false` to hide from the `/` menu. Use for background knowledge Claude should load automatically but users shouldn't invoke directly. Default: `true` |
| `allowed-tools` | string | No | Tools Claude can use without permission prompts when this skill is active (e.g., `Bash(agent-browser:*)`) |
| `model` | string | No | Model to use when this skill is active |
| `context` | string | No | Set to `"fork"` to run in an isolated subagent context |
| `agent` | string | No | Which subagent type to use when `context: fork` is set (e.g., `Explore`, `Plan`, or a custom agent name). Default: `general-purpose` |
| `hooks` | object | No | Lifecycle hooks scoped to this skill (same format as agent hooks) |
---
## Invocation Methods
| Method | Trigger | Example |
|--------|---------|---------|
| **Slash command** | User types `/skill-name` | `/weather-fetcher` |
| **Agent preload** | Listed in agent's `skills:` frontmatter | `skills: [weather-fetcher]` |
| **Auto-discovery** | Claude matches user intent to `description` | Automatic |
| **Direct mention** | User references the skill by name | "Use the weather-fetcher skill" |
---
## Invocation Control
| Frontmatter | User can invoke | Claude can invoke | Context loading |
|-------------|-----------------|-------------------|-----------------|
| (default) | Yes | Yes | Description always in context, full skill loads when invoked |
| `disable-model-invocation: true` | Yes | No | Description not in context, full skill loads when user invokes |
| `user-invocable: false` | No | Yes | Description always in context, full skill loads when invoked |
---
## Skill vs Agent vs Command
| Aspect | Skill | Agent | Command |
|--------|-------|-------|---------|
| **File location** | `.claude/skills/<name>/SKILL.md` | `.claude/agents/<name>.md` | `.claude/commands/<name>.md` |
| **Has own tools** | No (restricts via `allowed-tools`) | Yes (`tools:` field) | No |
| **Has memory** | No | Yes (`memory:` field) | No |
| **Has hooks** | Yes (`hooks:` field) | Yes (`hooks:` field) | No |
| **Can preload skills** | No | Yes (`skills:` field) | No |
| **User-invocable** | Yes (`/skill-name`) | No (invoked via Task tool) | Yes (`/command-name`) |
| **Runs in isolation** | Optional (`context: fork`) | Always isolated subprocess | Runs in main context |
| **Supporting files** | Yes (same directory) | No | No |
---
## String Substitutions
Available inside skill markdown for dynamic values:
| Variable | Description |
|----------|-------------|
| `$ARGUMENTS` | All arguments passed when invoking the skill |
| `$ARGUMENTS[N]` | Access a specific argument by 0-based index (e.g., `$ARGUMENTS[0]`) |
| `$N` | Shorthand for `$ARGUMENTS[N]` (e.g., `$0`, `$1`) |
| `${CLAUDE_SESSION_ID}` | Current session identifier |
| `` !`command` `` | Dynamic context injection — shell command output replaces the placeholder before Claude sees it |
---
## Example: Minimal Skill
```yaml
---
name: weather-fetcher
description: Instructions for fetching weather data from wttr.in API
---
Fetch the current temperature from https://wttr.in/Karachi?format=j1
```
## Example: Restricted Skill
```yaml
---
name: agent-browser
description: Browser automation CLI for AI agents
allowed-tools: Bash(agent-browser:*)
---
Every browser automation follows: navigate → snapshot → interact → re-snapshot.
```
## Example: Fork Context Skill
```yaml
---
name: code-analysis
description: Analyze code quality in isolation
context: fork
agent: Explore
---
Analyze the codebase for code quality issues without affecting the main conversation.
```
## Example: Full-Featured Skill (All Fields)
```yaml
---
name: fix-issue
description: Fix a GitHub issue by number, following team coding standards
argument-hint: [issue-number]
disable-model-invocation: true
user-invocable: true
allowed-tools: Read, Edit, Write, Bash(gh *), Bash(npm test *)
model: sonnet
context: fork
agent: general-purpose
hooks:
PostToolUse:
- matcher: "Edit|Write"
hooks:
- type: command
command: "./scripts/run-linter.sh"
---
Fix GitHub issue $0 following our coding standards.
## Context
- PR diff: !`gh pr diff`
- Issue details: !`gh issue view $0`
## Steps
1. Read the issue description
2. Understand the requirements
3. Implement the fix
4. Write tests
5. Create a commit
Session: ${CLAUDE_SESSION_ID}
```
---
## Scope and Priority
When skills share the same name, the higher-priority location wins:
| Location | Scope | Priority |
|----------|-------|----------|
| Enterprise (managed settings) | All users in organization | 1 (highest) |
| Personal (`~/.claude/skills/`) | All your projects | 2 |
| Project (`.claude/skills/`) | This project only | 3 |
| Plugin (`<plugin>/skills/`) | Where plugin is enabled | Namespaced (no conflict) |
Skills from `.claude/commands/` still work. If a skill and a command share the same name, the skill takes precedence.
---
## Skills in This Repository
| Skill | Description | Used By |
|-------|-------------|---------|
| `weather-fetcher` | Fetch temperature from wttr.in API | weather agent |
| `weather-transformer` | Apply transformations to temperature data | weather agent |
| `agent-browser` | Browser automation CLI commands | standalone (auto-discovery) |
| `presentation/vibe-to-agentic-framework` | Conceptual framework for the presentation | presentation-curator agent |
| `presentation/presentation-structure` | Slide format, weight system, navigation | presentation-curator agent |
| `presentation/presentation-styling` | CSS classes and component patterns | presentation-curator agent |
---
## Sources
- [Use skills — Claude Code Docs](https://code.claude.com/docs/en/skills)
- [Claude Code CHANGELOG](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md)