Struct SubAgentDef 

pub struct SubAgentDef {
    pub name: String,
    pub description: String,
    pub prompt: String,
    pub allowed_tools: Vec<String>,
    pub disallowed_tools: Vec<String>,
    pub model: Option<String>,
    pub max_turns: usize,
    pub max_context_tokens: usize,
    pub background: bool,
}

Definition of a subagent — its identity, capabilities, and constraints.

Analogous to a markdown frontmatter file in Claude Code’s subagent system.

Fields

name: String

Unique identifier (lowercase, hyphens). E.g. “code-reviewer”.

description: String

When the parent agent should delegate to this subagent.

prompt: String

The system prompt (markdown body). Replaces the default system prompt entirely.

allowed_tools: Vec<String>

Allowed tool names. If empty, inherits all default tools. Use this as an allowlist: only these tools will be available.

disallowed_tools: Vec<String>

Tool names to explicitly deny. Applied after allowed_tools.

model: Option<String>

Model override. If None, inherits from the parent.

max_turns: usize

Maximum agentic turns before the subagent stops.

max_context_tokens: usize

Maximum context window tokens.

background: bool

Whether to always run this subagent in the background.

Implementations

impl SubAgentDef

pub fn new( name: impl Into<String>, description: impl Into<String>, prompt: impl Into<String>, ) -> Self

Create a new subagent definition with required fields.

pub fn with_allowed_tools(self, tools: Vec<String>) -> Self

Restrict the subagent to only these tools.

pub fn with_disallowed_tools(self, tools: Vec<String>) -> Self

Deny specific tools (removed from inherited or allowed set).

pub fn with_model(self, model: impl Into<String>) -> Self

Override the model for this subagent.

pub fn with_max_turns(self, max_turns: usize) -> Self

Set maximum agentic turns.

pub fn with_max_context_tokens(self, tokens: usize) -> Self

Set maximum context window tokens.

pub fn with_background(self, background: bool) -> Self

Set whether to always run in background.

Trait Implementations

impl Clone for SubAgentDef

fn clone(&self) -> SubAgentDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SubAgentDef

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SubAgentDef

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SubAgentDef

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

where __S: Serializer,

Serialize this value into the given Serde serializer.