Update to ver 0.3.6

Author: hideya

CHANGELOG.md

@@ -5,6 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+
+## [0.3.6] - 2025-08-24
+
+### Added
+- More log messages for remote servers
+
+### Changed
+- Update the descriptions of the schema compatibility issue in README.md
+
+
 ## [0.3.5] - 2025-08-23
 
 ### Added

README.md

@@ -331,24 +331,24 @@ Different LLM providers have incompatible JSON Schema requirements for function
 - **Google Gemini API**: Rejects nullable fields and `$defs` references, requires strict OpenAPI 3.0 subset compliance
 - **Anthropic Claude** and **xAI Grok**: Very relaxed schema requirements with no documented restrictions
 
-**Note**: Google Vertex AI provides OpenAI-compatible endpoints that support nullable fields.
+**Note**: Google Vertex AI provides OpenAI-compatible endpoints that support more relaxed requirements.
 
 #### Real-World Impact
 
 This creates challenges for developers trying to create universal schemas across providers.
 
 Many MCP servers generate schemas that don't satisfy all providers' requirements.  
-For example, the official Notion MCP server [@notionhq/notion-mcp-server](https://www.npmjs.com/package/@notionhq/notion-mcp-server) (as of Jul 2, 2025) produces:
+For example, the official Notion local MCP server [@notionhq/notion-mcp-server](https://www.npmjs.com/package/@notionhq/notion-mcp-server) (version 1.9.0) and the remote server (at "https://mcp.notion.com/mcp", via "mcp-remote 0.1.18") produces:
 
 **OpenAI Warnings:**
 ```
-Zod field at `#/definitions/API-get-users/properties/start_cursor` uses `.optional()` without `.nullable()` which is not supported by the API. See: https://platform.openai.com/docs/guides/structured-outputs?api-mode=responses#all-fields-must-be-required
+Zod field at `#/definitions/read_file/properties/tail` uses `.optional()` without `.nullable()` which is not supported by the API. See: https://platform.openai.com/docs/guides/structured-outputs?api-mode=responses#all-fields-must-be-required
 ... followed by many more
 ```
 
 **Gemini Errors:**
 ```
-GoogleGenerativeAIFetchError: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent: [400 Bad Request] * GenerateContentRequest.tools[0].function_declarations[0].parameters.properties[children].items.properties[paragraph].properties[rich_text].items.properties[mention].any_of[0].required: only allowed for OBJECT type
+[GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent: [400 Bad Request] Invalid JSON payload received. Unknown name "exclusiveMaximum" at 'tools[0].function_declarations[14].parameters.properties[1].value': Cannot find field.
 ... followed by many more
 ```
 

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@h1deya/langchain-mcp-tools",
-  "version": "0.3.5",
+  "version": "0.3.6",
   "description": "MCP To LangChain Tools Conversion Utility",
   "license": "MIT",
   "keywords": [

package.json

@@ -422,6 +422,23 @@ async function convertSingleMcpToLangchainTools(
       transport = await createHttpTransportWithFallback(url, urlConfig, logger, serverName);
       logger.info(`MCP server "${serverName}": created transport, attempting connection`);
 
+      // Set up message and error handlers
+      transport.onmessage = (message) => {
+        logger.debug(`MCP server "${serverName}": Message Received:`, JSON.stringify(message, null, 2));
+      }
+
+      transport.onerror = (error) => {
+        // FIXME: somehow git remote server seems to send error with "{}" after closing
+        if (Object.keys(error).length === 0) {
+          return;
+        }
+        logger.error(`MCP server "${serverName}":`, error);
+      }
+
+      transport.onclose = () => {
+        logger.info(`MCP server "${serverName}": remote connection closed`);
+      }
+
     } else if ((transportType === "ws" || transportType === "websocket") ||
       (!transportType && (url?.protocol === "ws:" || url?.protocol === "wss:"))
     ) {

src/langchain-mcp-tools.ts

@@ -109,17 +109,11 @@ export async function test(): Promise<void> {
       //   }
       // },
 
-      // notion: {
-      //   "command": "npx",
-      //   "args": ["-y", "@notionhq/notion-mcp-server"],
-      //   "env": {
-      //     // Although the following implies that this MCP server is designed for
-      //     // OpenAI LLMs, it works fine with others models.
-      //     // Tested Claude and Gemini (with schema adjustments).
-      //     "OPENAPI_MCP_HEADERS": `{"Authorization": "Bearer ${process.env.NOTION_INTEGRATION_SECRET}", "Notion-Version": "2022-06-28"}`
-      //   },
-      // },
-
+      // The following Notion local MCP server is not recommended anymore?
+      // Refs:
+      // - https://developers.notion.com/docs/get-started-with-mcp
+      // - https://www.npmjs.com/package/@notionhq/notion-mcp-server
+      // 
       // "notion": {
       //   "command": "npx",
       //   "args": ["-y", "@suekou/mcp-notion-server"],
@@ -128,6 +122,12 @@ export async function test(): Promise<void> {
       //   }
       // },
 
+      // Run Notion remote MCP server via mcp-remote
+      // "notionMCP": {
+      //     "command": "npx",
+      //     "args": ["-y", "mcp-remote", "https://mcp.notion.com/mcp"],
+      // },
+
       // sqlite: {
       //   command: "uvx",
       //   args: [