fix: detect Claude format for /v1/messages + sanitize tool descriptions (#397)

open-sse/translator/request/claude-to-openai.js

@@ -59,7 +59,7 @@ export function claudeToOpenAIRequest(model, body, stream) {
       type: "function",
       function: {
         name: tool.name,
-        description: tool.description,
+        description: String(tool.description || ""),
         parameters: tool.input_schema || { type: "object", properties: {} }
       }
     }));

open-sse/translator/request/openai-responses.js

@@ -138,7 +138,7 @@ export function openaiResponsesToOpenAIRequest(model, body, stream, credentials)
           type: "function",
           function: {
             name,
-            description: tool.description,
+            description: String(tool.description || ""),
             parameters: tool.parameters,
             strict: tool.strict
           }
@@ -259,7 +259,7 @@ export function openaiToOpenAIResponsesRequest(model, body, stream, credentials)
         return {
           type: "function",
           name: tool.function.name,
-          description: tool.function.description,
+          description: String(tool.function.description || ""),
           parameters: tool.function.parameters,
           strict: tool.function.strict
         };