fix: address code review feedback

- Replace unsafe JSON string concatenation with jq in cmd_create() and cmd_update()
- Add HTTP status code checking and error message extraction in api_call()
- Prevent JSON injection vulnerabilities from special characters
- Improve error messages with actual API responses

packages/skills/brain/brain.sh

@@ -54,13 +54,30 @@ api_call() {
         -H "Content-Type: application/json"
         -H "x-workspace-id: ${WORKSPACE_ID}"
         -s
+        -w "\n%{http_code}"
     )
     
     if [[ -n "$data" ]]; then
         args+=(-d "$data")
     fi
     
-    curl "${args[@]}" "$url"
+    local response
+    response=$(curl "${args[@]}" "$url")
+    
+    # Extract HTTP status code from last line
+    local http_code
+    http_code=$(echo "$response" | tail -n1)
+    local body
+    body=$(echo "$response" | sed '$d')
+    
+    # Check for errors
+    if [[ "$http_code" -ge 400 ]]; then
+        local error_msg
+        error_msg=$(echo "$body" | jq -r '.message // .error // "API request failed"' 2>/dev/null || echo "API request failed")
+        error "HTTP $http_code: $error_msg"
+    fi
+    
+    echo "$body"
 }
 
 # Commands
@@ -142,20 +159,22 @@ cmd_create() {
     
     [[ -z "$content" ]] && error "Content required"
     
-    # Build JSON payload
-    local payload="{\"content\": \"$content\""
-    [[ -n "$title" ]] && payload+=", \"title\": \"$title\""
-    [[ -n "$category" ]] && payload+=", \"category\": \"$category\""
-    [[ -n "$status" ]] && payload+=", \"status\": \"$status\""
-    [[ -n "$priority" ]] && payload+=", \"priority\": \"$priority\""
-    
-    if [[ -n "$tags" ]]; then
-        local tags_json
-        tags_json=$(echo "$tags" | jq -R 'split(",") | map(gsub("^\\s+|\\s+$";""))')
-        payload+=", \"tags\": $tags_json"
-    fi
-    
-    payload+="}"
+    # Build JSON payload using jq for safety
+    local payload
+    payload=$(jq -n \
+        --arg content "$content" \
+        --arg title "$title" \
+        --arg category "$category" \
+        --arg status "$status" \
+        --arg priority "$priority" \
+        --arg tags "$tags" \
+        '{content: $content} + 
+         (if $title != "" then {title: $title} else {} end) +
+         (if $category != "" then {category: $category} else {} end) +
+         (if $status != "" then {status: $status} else {} end) +
+         (if $priority != "" then {priority: $priority} else {} end) +
+         (if $tags != "" then {tags: ($tags | split(",") | map(gsub("^\\s+|\\s+$";"")))} else {} end)'
+    )
     
     response=$(api_call POST "/api/ideas" "$payload")
     echo "$response" | jq -r '.id // empty' > /dev/null || error "Failed to create idea"
@@ -257,42 +276,20 @@ cmd_update() {
         esac
     done
     
-    # Build update payload
-    local payload="{"
-    local first=true
-    
-    if [[ -n "$title" ]]; then
-        payload+="\"title\": \"$title\""
-        first=false
-    fi
-    
-    if [[ -n "$content" ]]; then
-        [[ "$first" == false ]] && payload+=", "
-        payload+="\"content\": \"$content\""
-        first=false
-    fi
-    
-    if [[ -n "$status" ]]; then
-        [[ "$first" == false ]] && payload+=", "
-        payload+="\"status\": \"$status\""
-        first=false
-    fi
-    
-    if [[ -n "$category" ]]; then
-        [[ "$first" == false ]] && payload+=", "
-        payload+="\"category\": \"$category\""
-        first=false
-    fi
-    
-    if [[ -n "$tags" ]]; then
-        [[ "$first" == false ]] && payload+=", "
-        local tags_json
-        tags_json=$(echo "$tags" | jq -R 'split(",") | map(gsub("^\\s+|\\s+$";""))')
-        payload+="\"tags\": $tags_json"
-        first=false
-    fi
-    
-    payload+="}"
+    # Build update payload using jq for safety
+    local payload
+    payload=$(jq -n \
+        --arg title "$title" \
+        --arg content "$content" \
+        --arg status "$status" \
+        --arg category "$category" \
+        --arg tags "$tags" \
+        '(if $title != "" then {title: $title} else {} end) +
+         (if $content != "" then {content: $content} else {} end) +
+         (if $status != "" then {status: $status} else {} end) +
+         (if $category != "" then {category: $category} else {} end) +
+         (if $tags != "" then {tags: ($tags | split(",") | map(gsub("^\\s+|\\s+$";"")))} else {} end)'
+    )
     
     response=$(api_call PATCH "/api/ideas/${idea_id}" "$payload")
     echo "$response" | jq -r '.id // empty' > /dev/null || error "Failed to update idea"