diff --git a/packages/api/src/endpoints/anthropic/initialize.ts b/packages/api/src/endpoints/anthropic/initialize.ts
index 8bebd8467b..756afd5d75 100644
--- a/packages/api/src/endpoints/anthropic/initialize.ts
+++ b/packages/api/src/endpoints/anthropic/initialize.ts
@@ -80,7 +80,12 @@ export async function initializeAnthropic({
   const anthropicConfig = appConfig?.endpoints?.[EModelEndpoint.anthropic];
   const allConfig = appConfig?.endpoints?.all;
 
-  const result = getLLMConfig(credentials, clientOptions);
+  const result = getLLMConfig(credentials, {
+    ...clientOptions,
+    ...(anthropicConfig?.addParams != null && { addParams: anthropicConfig.addParams }),
+    ...(anthropicConfig?.dropParams != null && { dropParams: anthropicConfig.dropParams }),
+    ...(anthropicConfig?.defaultParams != null && { defaultParams: anthropicConfig.defaultParams }),
+  });
 
   if (anthropicConfig?.streamRate) {
     (result.llmConfig as Record<string, unknown>)._lc_stream_delay = anthropicConfig.streamRate;
diff --git a/packages/api/src/endpoints/anthropic/llm.spec.ts b/packages/api/src/endpoints/anthropic/llm.spec.ts
index b945eacb34..ec4cdabb45 100644
--- a/packages/api/src/endpoints/anthropic/llm.spec.ts
+++ b/packages/api/src/endpoints/anthropic/llm.spec.ts
@@ -1535,6 +1535,17 @@ describe('getLLMConfig', () => {
           }
         });
       });
+
+      it('should omit native web_search tool when dropParams includes web_search', () => {
+        const result = getLLMConfig('test-key', {
+          modelOptions: {
+            model: 'claude-3-opus',
+            web_search: true,
+          },
+          dropParams: ['web_search'],
+        });
+        expect(result.tools).toEqual([]);
+      });
     });
 
     describe('Parameter Precedence and Override Logic', () => {
diff --git a/packages/data-provider/src/config.ts b/packages/data-provider/src/config.ts
index ae3f5b9560..91d2461a04 100644
--- a/packages/data-provider/src/config.ts
+++ b/packages/data-provider/src/config.ts
@@ -454,6 +454,12 @@ export const anthropicEndpointSchema = baseEndpointSchema.merge(
     vertex: vertexAISchema.optional(),
     /** Optional: List of available models */
     models: z.array(z.string()).optional(),
+    /** Additional parameters passed to getLLMConfig (same pattern as custom endpoints) */
+    addParams: z.record(z.union([z.string(), z.number(), z.boolean(), z.null()])).optional(),
+    /** Parameters excluded from the Anthropic client; e.g. web_search when using LibreChat search tools */
+    dropParams: z.array(z.string()).optional(),
+    /** Default parameters applied when model options omit a value */
+    defaultParams: z.record(z.union([z.string(), z.number(), z.boolean(), z.null()])).optional(),
   }),
 );