Overview

Summary

The Inputs namespace contains classes for deserializing JSON data that Claude Code sends to hooks via stdin. Each hook event type has a corresponding input class.

Input Classes

Class	Hook Event	Description
`PreToolUseHookInput<T>`	PreToolUse	Received before a tool executes
`PostToolUseHookInput<T,R>`	PostToolUse	Received after a tool completes
`PermissionRequestHookInput<T>`	PermissionRequest	Received when permission is requested
`UserPromptSubmitHookInput`	UserPromptSubmit	Received when user submits a prompt
`StopHookInput`	Stop	Received when Claude finishes responding
`SubagentStopHookInput`	SubagentStop	Received when a subagent completes
`NotificationHookInput`	Notification	Received for notifications
`SessionStartHookInput`	SessionStart	Received when a session starts
`SessionEndHookInput`	SessionEnd	Received when a session ends
`PreCompactHookInput`	PreCompact	Received before context compaction

All input classes inherit from HookInputBase which provides common properties like SessionId, TranscriptPath, and CurrentWorkingDirectory.

Usage

Deserializing Hook Input

Use ClaudeHooksSerializer to deserialize input from stdin:

// For PreToolUse hooks
var input = ClaudeHooksSerializer.DeserializePreToolUseInput(Console.In.ReadToEnd());
Console.WriteLine($"Tool: {input?.ToolName}");
Console.WriteLine($"Session: {input?.SessionId}");

// For strongly-typed tool input (requires custom JsonSerializerContext)
var typedInput = ClaudeHooksSerializer.DeserializePreToolUseInput<MyToolInput>(
    json, MyJsonContext.Default.PreToolUseHookInputMyToolInput);

Common Base Properties

All inputs include these properties from HookInputBase:

SessionId - Unique session identifier
TranscriptPath - Path to conversation transcript
CurrentWorkingDirectory - Active working directory
PermissionMode - Current permission mode
HookEventName - The event that triggered this hook

Types

Classes

Name	Summary
HookInputBase	Base class containing common fields present in all hook inputs. All hooks receive these fields via JSON through stdin.
ToolHookInputBase	Base class for tool-related hook inputs that contain tool name, input, and use ID. Used as a base for PreToolUse and PostToolUse hook inputs.
NotificationHookInput	Represents the input received by a Notification hook. This hook runs when Claude Code sends notifications.
PermissionRequestHookInput	Represents the input received by a PermissionRequest hook. This hook runs when a permission dialog is shown and can automatically allow or deny permissions.
PostToolUseHookInput	Represents the input received by a PostToolUse hook. This hook runs after tool calls complete and includes the tool’s response.
PreCompactHookInput	Represents the input received by a PreCompact hook. This hook runs before a compact operation.
PreToolUseHookInput	Represents the input received by a PreToolUse hook. This hook runs before tool calls are executed and can block or modify them.
SessionEndHookInput	Represents the input received by a SessionEnd hook. This hook runs when a Claude Code session ends.
SessionStartHookInput	Represents the input received by a SessionStart hook. This hook runs when Claude Code starts a new session or resumes one.
StopHookInput	Represents the input received by a Stop hook. This hook runs when Claude Code finishes responding.
SubagentStopHookInput	Represents the input received by a SubagentStop hook. This hook runs when subagent tasks complete.
UserPromptSubmitHookInput	Represents the input received by a UserPromptSubmit hook. This hook runs when the user submits a prompt, before Claude processes it.

Getting Started

Guides

API Reference

Summary

Input Classes

Usage

Deserializing Hook Input

Common Base Properties

Types

Classes

​Summary

​Input Classes

​Usage

​Deserializing Hook Input

​Common Base Properties

​Types

​ Classes

Summary

Input Classes

Usage

Deserializing Hook Input

Common Base Properties

Types

Classes