Struct Settings 

pub struct Settings {
    pub system_prompt: Option<String>,
    pub permission_mode: Option<String>,
    pub model: Option<String>,
    pub small_fast_model: Option<String>,
    pub api_base_url: Option<String>,
    pub always_thinking_enabled: Option<bool>,
    pub allowed_tools: Option<Vec<String>>,
    pub denied_tools: Option<Vec<String>>,
    pub permissions: Option<PermissionSettings>,
    pub mcp_servers: Option<HashMap<String, McpServerConfig>>,
    pub env: Option<HashMap<String, String>>,
    pub extra: HashMap<String, Value>,
}

Claude Code settings structure

This mirrors the settings structure used by Claude Code.

Fields

system_prompt: Option<String>

Custom system prompt additions

permission_mode: Option<String>

Permission mode settings

model: Option<String>

Model to use

small_fast_model: Option<String>

Small/fast model for quick operations

api_base_url: Option<String>

API base URL override

always_thinking_enabled: Option<bool>

Always enable extended thinking mode When true, MAX_THINKING_TOKENS will be set to a default value

allowed_tools: Option<Vec<String>>

Allowed tools list (legacy, use permissions instead)

denied_tools: Option<Vec<String>>

Denied tools list (legacy, use permissions instead)

permissions: Option<PermissionSettings>

Permission settings with allow/deny/ask rules

mcp_servers: Option<HashMap<String, McpServerConfig>>

MCP servers configuration

env: Option<HashMap<String, String>>

Custom environment variables

extra: HashMap<String, Value>

Additional settings as raw JSON

Implementations

impl Settings

pub fn new() -> Self

Create empty settings

pub fn merge(&mut self, other: Settings)

Merge another settings into this one

Values from other take precedence over self.

Trait Implementations

impl Clone for Settings

fn clone(&self) -> Settings

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Settings

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Settings

fn default() -> Settings

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Settings

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Settings

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.