fix(hooks,db,mcp,worker): add type safety and error handling (#21)

- [x] Add type checking and error handling for JSON type assertions in user-prompt hook
- [x] Add error handling for session update query in CreateSDKSession
- [x] Update MCP tool description to reference sqlite-vec instead of ChromaDB
- [x] Fix MinConfidence sentinel value check from 0 to -1
- [x] Pass project parameter to vector search filter in handleSearchByPrompt
- [x] Return empty map instead of nil for successful responses without JSON body

cmd/hooks/user-prompt/main.go

@@ -94,8 +94,18 @@ func handleUserPrompt(ctx *hooks.HookContext, input *Input) (string, error) {
 		return "", nil
 	}
 
-	sessionID := int64(result["sessionDbId"].(float64))
-	promptNumber := int(result["promptNumber"].(float64))
+	// Safely extract session ID and prompt number with type checking
+	sessionDbIdRaw, ok := result["sessionDbId"].(float64)
+	if !ok {
+		return "", fmt.Errorf("invalid or missing sessionDbId in response")
+	}
+	sessionID := int64(sessionDbIdRaw)
+
+	promptNumberRaw, ok := result["promptNumber"].(float64)
+	if !ok {
+		return "", fmt.Errorf("invalid or missing promptNumber in response")
+	}
+	promptNumber := int(promptNumberRaw)
 
 	fmt.Fprintf(os.Stderr, "[user-prompt] Session %d, prompt #%d\n", sessionID, promptNumber)
 

internal/db/gorm/session_store.go

@@ -4,6 +4,7 @@ package gorm
 import (
 	"context"
 	"database/sql"
+	"fmt"
 	"time"
 
 	"gorm.io/gorm"
@@ -67,10 +68,12 @@ func (s *SessionStore) CreateSDKSession(ctx context.Context, claudeSessionID, pr
 			if userPrompt != "" {
 				updates["user_prompt"] = userPrompt
 			}
-			s.db.WithContext(ctx).
+			if err := s.db.WithContext(ctx).
 				Model(&SDKSession{}).
 				Where("claude_session_id = ?", claudeSessionID).
-				Updates(updates)
+				Updates(updates).Error; err != nil {
+				return 0, fmt.Errorf("failed to update session: %w", err)
+			}
 		}
 
 		// Fetch existing session

internal/mcp/server.go

@@ -164,7 +164,7 @@ func (s *Server) handleToolsList(req *Request) *Response {
 	tools := []Tool{
 		{
 			Name:        "search",
-			Description: "Unified search across all memory types (observations, sessions, and user prompts) using vector-first semantic search (ChromaDB).",
+			Description: "Unified search across all memory types (observations, sessions, and user prompts) using vector-first semantic search (sqlite-vec).",
 			InputSchema: map[string]any{
 				"type": "object",
 				"properties": map[string]any{
@@ -599,7 +599,8 @@ func (s *Server) handleFindRelatedObservations(ctx context.Context, args json.Ra
 		return "", fmt.Errorf("id is required")
 	}
 
-	if params.MinConfidence == 0 {
+	// Use -1 as sentinel for "not provided" since 0.0 is a valid threshold
+	if params.MinConfidence < 0 {
 		params.MinConfidence = 0.5
 	}
 

internal/worker/handlers.go

@@ -774,7 +774,7 @@ func (s *Service) handleSearchByPrompt(w http.ResponseWriter, r *http.Request) {
 
 	// Try vector search first if available
 	if s.vectorClient != nil && s.vectorClient.IsConnected() {
-		where := sqlitevec.BuildWhereFilter(sqlitevec.DocTypeObservation, "")
+		where := sqlitevec.BuildWhereFilter(sqlitevec.DocTypeObservation, project)
 
 		// Search with each expanded query and merge results
 		allVectorResults := make([]sqlitevec.QueryResult, 0)

marketplace.json

@@ -13,7 +13,7 @@
     {
       "name": "claude-mnemonic",
       "description": "Persistent memory system for Claude Code - Go implementation with SQLite and ChromaDB vector search",
-      "version": "0.10.5",
+      "version": "0.11.1",
       "author": {
         "name": "lukaszraczylo",
         "url": "https://github.com/lukaszraczylo"
@@ -23,25 +23,25 @@
       "license": "MIT",
       "homepage": "https://github.com/lukaszraczylo/claude-mnemonic",
       "releases": {
-        "latest": "0.10.5",
+        "latest": "0.11.1",
         "versions": {
-          "0.10.5": {
+          "0.11.1": {
             "releaseDate": "2026-01-07",
             "downloads": {
               "darwin-arm64": {
-                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.10.5/claude-mnemonic_0.10.5_darwin_arm64.tar.gz",
+                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.11.1/claude-mnemonic_0.11.1_darwin_arm64.tar.gz",
                 "format": "tar.gz",
-                "sha256": "2b175b0fb79b46f71bcd86d2a691c42942116833f233be03a042d586250c38dc"
+                "sha256": "b250152cd2f45f4971f7c1ebbe9c65830cbcf5e05e8fbed5e43f4d9bdc2dcbc3"
               },
               "linux-amd64": {
-                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.10.5/claude-mnemonic_0.10.5_linux_amd64.tar.gz",
+                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.11.1/claude-mnemonic_0.11.1_linux_amd64.tar.gz",
                 "format": "tar.gz",
-                "sha256": "c3dfd0459ae4ebed2fac0a64e353df53133417204e9c03a5f3ebf6ec8ac7f1d9"
+                "sha256": "e13b16b6e7c2881655d764e646489c22919a9c13aba82afedaefd8729c1dd4bb"
               },
               "windows-amd64": {
-                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.10.5/claude-mnemonic_0.10.5_windows_amd64.zip",
+                "url": "https://github.com/lukaszraczylo/claude-mnemonic/releases/download/v0.11.1/claude-mnemonic_0.11.1_windows_amd64.zip",
                 "format": "zip",
-                "sha256": "a9d6418da71749611144618ddd4e61769931759731021b1f97c1fd57241b374e"
+                "sha256": "23529ada50c98167cc2da55d880ae5b16c7cce326ada516e110643ee2274ae44"
               }
             }
           }

pkg/hooks/worker.go

@@ -251,8 +251,8 @@ func POST(port int, path string, body interface{}) (map[string]interface{}, erro
 
 	var result map[string]interface{}
 	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
-		// Not all endpoints return JSON
-		return nil, nil
+		// Not all endpoints return JSON body - return empty map for success with no body
+		return map[string]interface{}{}, nil
 	}
 
 	return result, nil