🧩 refactor: Tool Context Builders for Web Search & Image Gen (#11644)

* fix: Web Search + Image Gen Tool Context

- Added `buildWebSearchContext` function to create a structured context for web search tools, including citation format instructions.
- Updated `loadTools` and `loadToolDefinitionsWrapper` functions to utilize the new web search context, improving tool initialization and response handling.
- Introduced logic to handle image editing tools with `buildImageToolContext`, enhancing the overall tool management capabilities.
- Refactored imports in `ToolService.js` to include the new context builders for better organization and maintainability.

* fix: Trim critical output escape sequence instructions in web toolkit

- Updated the critical output escape sequence instructions in the web toolkit to include a `.trim()` method, ensuring that unnecessary whitespace is removed from the output. This change enhances the consistency and reliability of the generated output.

api/server/services/ToolService.js

@@ -17,6 +17,8 @@ const {
   loadToolDefinitions,
   GenerationJobManager,
   isActionDomainAllowed,
+  buildWebSearchContext,
+  buildImageToolContext,
   buildToolClassification,
 } = require('@librechat/api');
 const {
@@ -28,6 +30,7 @@ const {
   ContentTypes,
   imageGenTools,
   EModelEndpoint,
+  EToolResources,
   actionDelimiter,
   ImageVisionTool,
   openapiToFunction,
@@ -682,9 +685,14 @@ async function loadToolDefinitionsWrapper({ req, res, agent, streamId = null, to
 
   /** @type {Record<string, string>} */
   const toolContextMap = {};
+  const hasWebSearch = filteredTools.includes(Tools.web_search);
   const hasFileSearch = filteredTools.includes(Tools.file_search);
   const hasExecuteCode = filteredTools.includes(Tools.execute_code);
 
+  if (hasWebSearch) {
+    toolContextMap[Tools.web_search] = buildWebSearchContext();
+  }
+
   if (hasExecuteCode && tool_resources) {
     try {
       const authValues = await loadAuthValues({
@@ -722,6 +730,34 @@ async function loadToolDefinitionsWrapper({ req, res, agent, streamId = null, to
     }
   }
 
+  const imageFiles = tool_resources?.[EToolResources.image_edit]?.files ?? [];
+  if (imageFiles.length > 0) {
+    const hasOaiImageGen = filteredTools.includes('image_gen_oai');
+    const hasGeminiImageGen = filteredTools.includes('gemini_image_gen');
+
+    if (hasOaiImageGen) {
+      const toolContext = buildImageToolContext({
+        imageFiles,
+        toolName: `${EToolResources.image_edit}_oai`,
+        contextDescription: 'image editing',
+      });
+      if (toolContext) {
+        toolContextMap.image_edit_oai = toolContext;
+      }
+    }
+
+    if (hasGeminiImageGen) {
+      const toolContext = buildImageToolContext({
+        imageFiles,
+        toolName: 'gemini_image_gen',
+        contextDescription: 'image context',
+      });
+      if (toolContext) {
+        toolContextMap.gemini_image_gen = toolContext;
+      }
+    }
+  }
+
   return {
     toolRegistry,
     userMCPAuthMap,