Struct HookInput 

pub struct HookInput {

    pub session_id: SessionId,
    pub transcript_path: String,
    pub cwd: String,
    pub permission_mode: String,
    pub hook_event_name: String,
    pub runtime: Option<Runtime>,
    pub tool_name: Option<ToolName>,
    pub tool_input: Option<Value>,
    pub tool_use_id: Option<String>,
    pub tool_response: Option<Value>,
    pub prompt: Option<String>,
    pub message: Option<String>,
    pub notification_type: Option<String>,
    pub stop_hook_active: Option<bool>,
    pub trigger: Option<String>,
    pub custom_instructions: Option<String>,
    pub source: Option<String>,
    pub reason: Option<String>,
    pub prompt_response: Option<String>,
    pub timestamp: Option<String>,
}

Hook event payload received from Claude Code via stdin.

This matches the JSON schema that Claude Code sends to hook commands. Fields vary by hook type - we capture them all and let the Haskell handler pick what it needs.

Fields

session_id: SessionId

Session ID from Claude Code.

transcript_path: String

Path to the transcript file.

cwd: String

Current working directory.

permission_mode: String

Permission mode (default, plan, acceptEdits, dontAsk, bypassPermissions).

hook_event_name: String

The hook event name (PreToolUse, PostToolUse, etc.).

runtime: Option<Runtime>

Runtime environment (claude, gemini). Injected by Rust before WASM call.

tool_name: Option<ToolName>

Tool name for tool-related hooks.

tool_input: Option<Value>

Tool input arguments for tool-related hooks.

tool_use_id: Option<String>

Tool use ID for tool-related hooks.

tool_response: Option<Value>

Tool response (PostToolUse only).

prompt: Option<String>

User prompt text (UserPromptSubmit).

message: Option<String>

Notification message (Notification).

notification_type: Option<String>

Notification type (Notification).

stop_hook_active: Option<bool>

Whether stop hook is active (Stop, SubagentStop).

trigger: Option<String>

Compact trigger (PreCompact).

custom_instructions: Option<String>

Custom instructions (PreCompact).

source: Option<String>

Session start source (SessionStart).

reason: Option<String>

Session end reason (SessionEnd).

prompt_response: Option<String>

Agent’s response text (AfterAgent). Ref: https://geminicli.com/docs/hooks/reference/#afteragent

timestamp: Option<String>

Event timestamp. Ref: https://geminicli.com/docs/hooks/reference/#afteragent

Trait Implementations

impl Clone for HookInput

fn clone(&self) -> HookInput

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HookInput

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for HookInput

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for HookInput

fn eq(&self, other: &HookInput) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for HookInput

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for HookInput