diff --git a/packages/slack/src/services/auth.ts b/packages/slack/src/services/auth.ts
index 97d9af92d..621d345dc 100644
--- a/packages/slack/src/services/auth.ts
+++ b/packages/slack/src/services/auth.ts
@@ -85,6 +85,9 @@ export class SlackAuthService {
       // Exchange code for tokens
       const tokenResponse = await this.exchangeCodeForTokens(code);
 
+      // Log the raw response for debugging
+      console.info('Slack OAuth raw response:', JSON.stringify(tokenResponse, null, 2));
+
       // Validate response
       const oauthData = validateWithSchema(
         SlackOAuthResponseSchema,
@@ -213,6 +216,18 @@ export class SlackAuthService {
       }
 
       const data = await response.json();
+
+      // Check if Slack returned an error in the response body
+      const responseData = data as { ok?: boolean; error?: string; error_description?: string };
+      if (responseData.ok === false || responseData.error) {
+        console.error('Slack OAuth error response:', {
+          ok: responseData.ok,
+          error: responseData.error,
+          error_description: responseData.error_description,
+          fullResponse: data,
+        });
+      }
+
       return data;
     } catch (error) {
       if (error instanceof SlackIntegrationError) {
diff --git a/packages/slack/src/utils/validation-helpers.ts b/packages/slack/src/utils/validation-helpers.ts
index ccbb34893..0d016d3f3 100644
--- a/packages/slack/src/utils/validation-helpers.ts
+++ b/packages/slack/src/utils/validation-helpers.ts
@@ -17,6 +17,14 @@ export function validateWithSchema<T>(
   const result = schema.safeParse(data);
 
   if (!result.success) {
+    // Log detailed validation errors for debugging
+    console.error('Schema validation failed:', {
+      message: errorMessage,
+      errors: result.error.errors,
+      flattened: result.error.flatten(),
+      receivedData: data,
+    });
+
     throw new SlackIntegrationError('UNKNOWN_ERROR', errorMessage, false, {
       zodError: result.error.flatten(),
     });
diff --git a/packages/typescript-config/package.json b/packages/typescript-config/package.json
index 0b533f742..410f435b2 100644
--- a/packages/typescript-config/package.json
+++ b/packages/typescript-config/package.json
@@ -4,4 +4,4 @@
   "private": false,
   "license": "MIT",
   "scripts": {}
-}
\ No newline at end of file
+}