Refactor hooks codebase: reduce complexity and improve maintainability (#204)

* refactor: Clean up hook-response and new-hook files

- Removed 'PreCompact' hook type and associated logic from hook-response.ts for improved type safety.
- Deleted extensive architecture comments in new-hook.ts to streamline code readability.
- Simplified debug logging in new-hook.ts to reduce verbosity.
- Enhanced ensureWorkerRunning function in worker-utils.ts with a final health check before throwing errors.
- Added a new documentation file outlining the hooks cleanup process and future improvements.

* Refactor cleanup and user message hooks

- Updated cleanup-hook.js to improve error handling and remove unnecessary input checks.
- Simplified user-message-hook.js by removing time-sensitive announcements and streamlining output.
- Enhanced logging functionality in both hooks for better debugging and clarity.

* Refactor error handling in hooks to use centralized error handler

- Introduced `handleWorkerError` function in `src/shared/hook-error-handler.ts` to manage worker-related errors.
- Updated `context-hook.ts`, `new-hook.ts`, `save-hook.ts`, and `summary-hook.ts` to utilize the new error handler, simplifying error management and improving code readability.
- Removed repetitive error handling logic from individual hooks, ensuring consistent user-friendly messages for connection issues.

* Refactor user-message and summary hooks to utilize shared transcript parser; introduce hook exit codes

- Moved user message extraction logic to a new shared module `transcript-parser.ts` for better code reuse.
- Updated `summary-hook.ts` to use the new `extractLastMessage` function for retrieving user and assistant messages.
- Replaced direct exit code usage in `user-message-hook.ts` with constants from `hook-constants.ts` for improved readability and maintainability.
- Added `HOOK_EXIT_CODES` to `hook-constants.ts` to standardize exit codes across hooks.

* Refactor hook input interfaces to enforce required fields

- Updated `SessionStartInput`, `UserPromptSubmitInput`, `PostToolUseInput`, and `StopInput` interfaces to require `session_id`, `transcript_path`, and `cwd` fields, ensuring better type safety and clarity in hook inputs.
- Removed optional index signatures from these interfaces to prevent unintended properties and improve code maintainability.
- Adjusted related hook implementations to align with the new interface definitions.

* Refactor save-hook to remove tool skipping logic; enhance summary-hook to handle spinner stopping with error logging; update SessionRoutes to load skip tools from settings; add CLAUDE_MEM_SKIP_TOOLS to SettingsDefaultsManager for configurable tool exclusion.

* Document CLAUDE_MEM_SKIP_TOOLS setting in public docs

Added documentation for the new CLAUDE_MEM_SKIP_TOOLS configuration
setting in response to PR review feedback. Users can now discover and
customize which tools are excluded from observations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

src/hooks/save-hook.ts

@@ -12,6 +12,7 @@ import { logger } from '../utils/logger.js';
 import { ensureWorkerRunning, getWorkerPort } from '../shared/worker-utils.js';
 import { HOOK_TIMEOUTS } from '../shared/hook-constants.js';
 import { happy_path_error__with_fallback } from '../utils/silent-debug.js';
+import { handleWorkerError } from '../shared/hook-error-handler.js';
 
 export interface PostToolUseInput {
   session_id: string;
@@ -19,18 +20,8 @@ export interface PostToolUseInput {
   tool_name: string;
   tool_input: any;
   tool_response: any;
-  [key: string]: any;
 }
 
-// Tools to skip (low value or too frequent)
-const SKIP_TOOLS = new Set([
-  'ListMcpResourcesTool',  // MCP infrastructure
-  'SlashCommand',          // Command invocation (observe what it produces, not the call)
-  'Skill',                 // Skill invocation (observe what it produces, not the call)
-  'TodoWrite',             // Task management meta-tool
-  'AskUserQuestion'        // User interaction, not substantive work
-]);
-
 /**
  * Save Hook Main Logic - Fire-and-forget HTTP client
  */
@@ -44,11 +35,6 @@ async function saveHook(input?: PostToolUseInput): Promise<void> {
 
   const { session_id, cwd, tool_name, tool_input, tool_response } = input;
 
-  if (SKIP_TOOLS.has(tool_name)) {
-    console.log(createHookResponse('PostToolUse', true));
-    return;
-  }
-
   const port = getWorkerPort();
 
   const toolStr = logger.formatTool(tool_name, tool_input);
@@ -86,11 +72,7 @@ async function saveHook(input?: PostToolUseInput): Promise<void> {
 
     logger.debug('HOOK', 'Observation sent successfully', { toolName: tool_name });
   } catch (error: any) {
-    // Only show restart message for connection errors, not HTTP errors
-    if (error.cause?.code === 'ECONNREFUSED' || error.name === 'TimeoutError' || error.message.includes('fetch failed')) {
-      throw new Error("There's a problem with the worker. If you just updated, type `pm2 restart claude-mem-worker` in your terminal to continue");
-    }
-    throw error;
+    handleWorkerError(error);
   }
 
   console.log(createHookResponse('PostToolUse', true));