Enum AgentEvent 

pub enum AgentEvent {
    AssistantText {
        delta: String,
    },
    ToolUse {
        tool_use_id: String,
        tool: String,
        input: Value,
    },
    ToolResult {
        tool_use_id: String,
        output: Value,
        is_error: bool,
    },
    Cost {
        cost_usd: f64,
        tokens: TokenCounts,
    },
    Done {
        response: String,
        transcript: Vec<AgentTurn>,
    },
    Error {
        message: String,
    },
    CompactionBoundary {
        trigger: CompactionTrigger,
        pre_tokens: u64,
        post_tokens: u64,
        cumulative_dropped_tokens: u64,
        duration_ms: u64,
    },
}

Discriminated streaming event. Same union for both the agent pane (renders into the UI) and the drone Agent block (accumulates until Done, returns AgentRunResult).

Provider-specific extension goes through a Custom variant reserved here but intentionally not shipped Phase 1.5 — leave the enum open for it. See spec §8 risks.

Variants

AssistantText

Streaming text chunk from the assistant. Agent pane appends to the visible transcript; drone Agent block buffers until Done.

Fields

delta: String

ToolUse

Tool invocation about to run. input is the provider’s raw tool input JSON; renderers may dispatch on tool name.

Fields

tool_use_id: String

tool: String

input: Value

ToolResult

Tool execution result.

Fields

tool_use_id: String

output: Value

is_error: bool

Cost

Final cost + token accounting. Emitted once per run, before Done.

Fields

cost_usd: f64

tokens: TokenCounts

Done

Run completed successfully. response is the final assistant message text (the drone Agent block’s primary output). transcript is the full ordered turn list for audit / replay.

Fields

response: String

transcript: Vec<AgentTurn>

Error

Run failed. message is the user-facing error.

Fields

message: String

CompactionBoundary

Context compaction completed. Sourced from Claude Code’s type: "system", subtype: "compact_boundary" stream-json frame — exact data, not a heuristic. See docs/specs/SPEC_COMPACTION_DETECTION_AND_HANDLING_2026_07_31.md §2/§4.1 for the full design rationale and the source frame shape this is translated from.

Fields

trigger: CompactionTrigger

pre_tokens: u64

post_tokens: u64

cumulative_dropped_tokens: u64

duration_ms: u64

Trait Implementations

impl Clone for AgentEvent

fn clone(&self) -> AgentEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AgentEvent

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AgentEvent

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for AgentEvent

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TS for AgentEvent

type WithoutGenerics = AgentEvent

If this type does not have generic parameters, then WithoutGenerics should just be Self. If the type does have generic parameters, then all generic parameters must be replaced with a dummy type, e.g ts_rs::Dummy or ().
The only requirement for these dummy types is that EXPORT_TO must be None.

type OptionInnerType = AgentEvent

If the implementing type is std::option::Option<T>, then this associated type is set to T. All other implementations of TS should set this type to Self instead.

fn ident(cfg: &Config) -> String

Identifier of this type, excluding generic parameters.

fn docs() -> Option<String>

JSDoc comment to describe this type in TypeScript - when TS is derived, docs are automatically read from your doc comments or #[doc = ".."] attributes

fn name(cfg: &Config) -> String

Name of this type in TypeScript, including generic parameters

fn decl_concrete(cfg: &Config) -> String

Declaration of this type using the supplied generic arguments. The resulting TypeScript definition will not be generic. For that, see TS::decl(). If this type is not generic, then this function is equivalent to TS::decl().

fn decl(cfg: &Config) -> String

Declaration of this type, e.g. type User = { user_id: number, ... }. This function will panic if the type has no declaration.

fn inline(cfg: &Config) -> String

Formats this types definition in TypeScript, e.g { user_id: number }. This function will panic if the type cannot be inlined.

fn inline_flattened(cfg: &Config) -> String

Flatten a type declaration. This function will panic if the type cannot be flattened.

fn visit_generics(v: &mut impl TypeVisitor)

where Self: 'static,

Iterates over all type parameters of this type.

fn output_path() -> Option<PathBuf>

Returns the output path to where T should be exported, relative to the output directory. The returned path does not include any base directory.

fn visit_dependencies(v: &mut impl TypeVisitor)

where Self: 'static,

Iterates over all dependency of this type.

fn dependencies(cfg: &Config) -> Vec<Dependency>

where Self: 'static,

Resolves all dependencies of this type recursively.

fn export(cfg: &Config) -> Result<(), ExportError>

where Self: 'static,

Manually export this type to the filesystem. To export this type together with all of its dependencies, use [TS::export_all].

fn export_all(cfg: &Config) -> Result<(), ExportError>

where Self: 'static,

Manually export this type to the filesystem, together with all of its dependencies. To export only this type, without its dependencies, use [TS::export].

fn export_to_string(cfg: &Config) -> Result<String, ExportError>

where Self: 'static,

Manually generate bindings for this type, returning a String. This function does not format the output, even if the format feature is enabled.