[BUG]: Few MCP servers are not supported - Error when adding gateway

### 🐞 Bug Summary

Few MCP servers are not supported. Raising error  when trying to add gateway.

MCP Url : https://complex-tools-openapi-1.onrender.com/mcp/

Error is as given below : 

<img width="1743" height="394" alt="Image" src="https://github.com/user-attachments/assets/5a97852b-07c2-47d5-b352-232007064129" />

---

### 🧩 Affected Component
Select the area of the project impacted:

- [x] `mcpgateway` - API
- [x] `mcpgateway` - UI (admin panel)
- [ ] `mcpgateway.wrapper` - stdio wrapper
- [ ] Federation or Transports
- [ ] CLI, Makefiles, or shell scripts
- [ ] Container setup (Docker/Podman/Compose)
- [x] Other (explain below) 

Affects Watson Orchestrate Integrations.

---

### 🔁 Steps to Reproduce

1. add add gateway with `https://complex-tools-openapi-1.onrender.com/mcp/`

---

### 🤔 Expected Behavior
What should have happened instead?
Gateway should have been created.

---

### 📓 Logs / Error Output
Paste any relevant stack traces or logs here.
⚠️ **Do not paste secrets, credentials, or tokens.**


```
2026-01-22T06:12:13 - httpx - INFO - HTTP Request: POST https://complex-tools-openapi-1.onrender.com/mcp/ "HTTP/1.1 200 OK"
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - response_closed.started
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - response_closed.complete
2026-01-22T06:12:13 - mcp.client.streamable_http - DEBUG - Sending client message: root=JSONRPCRequest(method='tools/list', params=None, jsonrpc='2.0', id=1)
2026-01-22T06:12:13 - httpcore.connection - DEBUG - connect_tcp.started host='complex-tools-openapi-1.onrender.com' port=443 local_address=None timeout=30 socket_options=None
2026-01-22T06:12:13 - httpcore.connection - DEBUG - connect_tcp.complete return_value=<httpcore._backends.anyio.AnyIOStream object at 0xe0bd9136be00>
2026-01-22T06:12:13 - httpcore.connection - DEBUG - start_tls.started ssl_context=<ssl.SSLContext object at 0xe0bd901be3d0> server_hostname='complex-tools-openapi-1.onrender.com' timeout=30
2026-01-22T06:12:13 - httpcore.connection - DEBUG - start_tls.complete return_value=<httpcore._backends.anyio.AnyIOStream object at 0xe0bd9136bf80>
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - send_request_headers.started request=<Request [b'POST']>
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - send_request_headers.complete
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - send_request_body.started request=<Request [b'POST']>
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - send_request_body.complete
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - receive_response_headers.started request=<Request [b'POST']>
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - receive_response_headers.complete return_value=(b'HTTP/1.1', 200, b'OK', [(b'Date', b'Thu, 22 Jan 2026 06:12:13 GMT'), (b'Content-Type', b'application/json; charset=utf-8'), (b'Content-Length', b'901'), (b'Connection', b'keep-alive'), (b'CF-RAY', b'9c1ce5ff3b9f9e38-SIN'), (b'access-control-allow-credentials', b'true'), (b'access-control-allow-origin', b'*'), (b'Content-Encoding', b'br'), (b'etag', b'W/"a76-aityqdS5sz/Wqk/Mw35Yr4tmkUw"'), (b'rndr-id', b'9db05182-c994-4ee2'), (b'vary', b'Accept-Encoding'), (b'x-powered-by', b'Express'), (b'x-render-origin-server', b'Render'), (b'cf-cache-status', b'DYNAMIC'), (b'Server', b'cloudflare'), (b'alt-svc', b'h3=":443"; ma=86400')])
2026-01-22T06:12:13 - httpx - INFO - HTTP Request: POST https://complex-tools-openapi-1.onrender.com/mcp/ "HTTP/1.1 200 OK"
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - receive_response_body.started request=<Request [b'POST']>
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - receive_response_body.complete
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - response_closed.started
2026-01-22T06:12:13 - httpcore.http11 - DEBUG - response_closed.complete
2026-01-22T06:12:13 - mcpgateway.services.gateway_service - INFO - Fetched 2 tools from gateway
2026-01-22T06:12:13 - httpcore.connection - DEBUG - close.started
2026-01-22T06:12:13 - httpcore.connection - DEBUG - close.complete
2026-01-22T06:12:13 - mcpgateway.services.gateway_service - ERROR - ValueErrors in group: (ValueError("Invalid tool input schema: {'type': 'object', 'required': ['name', 'sku', 'quantity', 'price'], 'properties': {'name': {'type': 'string', 'description': 'Item name', 'minLength': 1, 'maxLength': 200}, 'sku': {'type': 'string', 'description': 'Stock Keeping Unit', 'pattern': '^[A-Z]{3}-[0-9]{3}$'}, 'quantity': {'type': 'integer', 'description': 'Quantity in stock', 'minimum': 0, 'maximum': 10000}, 'price': {'type': 'number', 'description': 'Unit price', 'minimum': 0, 'exclusiveMinimum': True}, 'category': {'type': 'string', 'description': 'Item category', 'enum': ['Electronics', 'Accessories', 'Furniture', 'Office Supplies']}, 'specifications': {'type': 'object', 'description': 'Nested specifications object', 'properties': {'brand': {'type': 'string', 'description': 'Brand name'}, 'model': {'type': 'string', 'description': 'Model number'}, 'warranty': {'type': 'string', 'description': 'Warranty period'}}}}} is not valid under any of the given schemas\n\nFailed validating 'anyOf' in metaschema['properties']['properties']['additionalProperties']['properties']['items']:\n    {'anyOf': [{'$ref': '#'}, {'$ref': '#/definitions/schemaArray'}],\n     'default': True}\n\nOn schema['properties']['items']['items']:\n    {'type': 'object',\n     'required': ['name', 'sku', 'quantity', 'price'],\n     'properties': {'name': {'type': 'string',\n                             'description': 'Item name',\n                             'minLength': 1,\n                             'maxLength': 200},\n                    'sku': {'type': 'string',\n                            'description': 'Stock Keeping Unit',\n                            'pattern': '^[A-Z]{3}-[0-9]{3}$'},\n                    'quantity': {'type': 'integer',\n                                 'description': 'Quantity in stock',\n                                 'minimum': 0,\n                                 'maximum': 10000},\n                    'price': {'type': 'number',\n                              'description': 'Unit price',\n                              'minimum': 0,\n                              'exclusiveMinimum': True},\n                    'category': {'type': 'string',\n                                 'description': 'Item category',\n                                 'enum': ['Electronics',\n                                          'Accessories',\n                                          'Furniture',\n                                          'Office Supplies']},\n                    'specifications': {'type': 'object',\n                                       'description': 'Nested '\n                                                      'specifications '\n                                                      'object',\n                                       'properties': {'brand': {'type': 'string',\n                                                                'description': 'Brand '\n                                                                               'name'},\n                                                      'model': {'type': 'string',\n                                                                'description': 'Model '\n                                                                               'number'},\n                                                      'warranty': {'type': 'string',\n                                                                   'description': 'Warranty '\n                                                                                  'period'}}}}}"),)
2026-01-22T06:12:13 - mcpgateway.services.structured_logger - ERROR - [gateway_service] Gateway creation failed due to validation error
2026-01-22T06:12:13 - mcpgateway.services.structured_logger - WARNING - [http_gateway] Request completed: POST /admin/gateways - 400
2026-01-22T06:12:13 - uvicorn.access - INFO - 172.17.0.1:36002 - "POST /admin/gateways HTTP/1.1" 400
2026-01-22T06:12:13 - uvicorn.error - ERROR - Exception in ASGI application
Traceback (most recent call last):
  File "/app/.venv/lib64/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 416, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/fastapi/applications.py", line 1135, in __call__
    await super().__call__(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/applications.py", line 107, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/mcpgateway/main.py", line 1433, in __call__
    response = await self.dispatch(request, call_next)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/mcpgateway/middleware/token_scoping.py", line 784, in __call__
    return await call_next(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/mcpgateway/main.py", line 1431, in call_next
    return await self._call_streamable_http(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/mcpgateway/main.py", line 1484, in _call_streamable_http
    await self.application(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 198, in __call__
    raise app_exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/base.py", line 144, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "/app/.venv/lib64/python3.12/site-packages/starlette_compress/__init__.py", line 92, in __call__
    return await self._zstd(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/starlette_compress/_zstd_legacy.py", line 100, in __call__
    await self.app(scope, receive, wrapper)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/cors.py", line 93, in __call__
    await self.simple_response(scope, receive, send, request_headers=headers)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/cors.py", line 144, in simple_response
    await self.app(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/prometheus_fastapi_instrumentator/middleware.py", line 177, in __call__
    raise exc
  File "/app/.venv/lib64/python3.12/site-packages/prometheus_fastapi_instrumentator/middleware.py", line 175, in __call__
    await self.app(scope, receive, send_wrapper)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/middleware/exceptions.py", line 63, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/app/.venv/lib64/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
    await self.app(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/routing.py", line 716, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/routing.py", line 736, in app
    await route.handle(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/routing.py", line 290, in handle
    await self.app(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/fastapi/routing.py", line 115, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/app/.venv/lib64/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/app/.venv/lib64/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/app/.venv/lib64/python3.12/site-packages/fastapi/routing.py", line 97, in app
    async with AsyncExitStack() as request_stack:
               ^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/contextlib.py", line 754, in __aexit__
    raise exc_details[1]
  File "/usr/lib64/python3.12/contextlib.py", line 737, in __aexit__
    cb_suppress = await cb(*exc_details)
                  ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/contextlib.py", line 217, in __aexit__
    await anext(self.gen)
  File "/app/.venv/lib64/python3.12/site-packages/fastapi/concurrency.py", line 39, in contextmanager_in_threadpool
    await anyio.to_thread.run_sync(
  File "/app/.venv/lib64/python3.12/site-packages/anyio/to_thread.py", line 63, in run_sync
    return await get_async_backend().run_sync_in_worker_thread(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py", line 2502, in run_sync_in_worker_thread
    return await future
           ^^^^^^^^^^^^
  File "/app/.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py", line 986, in run
    result = context.run(func, *args)
             ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/contextlib.py", line 144, in __exit__
    next(self.gen)
  File "/app/mcpgateway/db.py", line 5288, in get_db
    db.commit()
  File "/app/.venv/lib64/python3.12/site-packages/sqlalchemy/orm/session.py", line 2030, in commit
    trans.commit(_to_root=True)
  File "<string>", line 2, in commit
  File "/app/.venv/lib64/python3.12/site-packages/sqlalchemy/orm/state_changes.py", line 101, in _go
    self._raise_for_prerequisite_state(fn.__name__, current_state)
  File "/app/.venv/lib64/python3.12/site-packages/sqlalchemy/orm/session.py", line 971, in _raise_for_prerequisite_state
    raise sa_exc.PendingRollbackError(
sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled back due to a previous exception during flush. To begin a new transaction with this Session, first issue Session.rollback(). Original exception was: Invalid tool input schema: {'type': 'object', 'required': ['name', 'sku', 'quantity', 'price'], 'properties': {'name': {'type': 'string', 'description': 'Item name', 'minLength': 1, 'maxLength': 200}, 'sku': {'type': 'string', 'description': 'Stock Keeping Unit', 'pattern': '^[A-Z]{3}-[0-9]{3}$'}, 'quantity': {'type': 'integer', 'description': 'Quantity in stock', 'minimum': 0, 'maximum': 10000}, 'price': {'type': 'number', 'description': 'Unit price', 'minimum': 0, 'exclusiveMinimum': True}, 'category': {'type': 'string', 'description': 'Item category', 'enum': ['Electronics', 'Accessories', 'Furniture', 'Office Supplies']}, 'specifications': {'type': 'object', 'description': 'Nested specifications object', 'properties': {'brand': {'type': 'string', 'description': 'Brand name'}, 'model': {'type': 'string', 'description': 'Model number'}, 'warranty': {'type': 'string', 'description': 'Warranty period'}}}}} is not valid under any of the given schemas

Failed validating 'anyOf' in metaschema['properties']['properties']['additionalProperties']['properties']['items']:
    {'anyOf': [{'$ref': '#'}, {'$ref': '#/definitions/schemaArray'}],
     'default': True}

On schema['properties']['items']['items']:
    {'type': 'object',
     'required': ['name', 'sku', 'quantity', 'price'],
     'properties': {'name': {'type': 'string',
                             'description': 'Item name',
                             'minLength': 1,
                             'maxLength': 200},
                    'sku': {'type': 'string',
                            'description': 'Stock Keeping Unit',
                            'pattern': '^[A-Z]{3}-[0-9]{3}$'},
                    'quantity': {'type': 'integer',
                                 'description': 'Quantity in stock',
                                 'minimum': 0,
                                 'maximum': 10000},
                    'price': {'type': 'number',
                              'description': 'Unit price',
                              'minimum': 0,
                              'exclusiveMinimum': True},
                    'category': {'type': 'string',
                                 'description': 'Item category',
                                 'enum': ['Electronics',
                                          'Accessories',
                                          'Furniture',
                                          'Office Supplies']},
                    'specifications': {'type': 'object',
                                       'description': 'Nested '
                                                      'specifications '
                                                      'object',
                                       'properties': {'brand': {'type': 'string',
                                                                'description': 'Brand '
                                                                               'name'},
                                                      'model': {'type': 'string',
                                                                'description': 'Model '
                                                                               'number'},
                                                      'warranty': {'type': 'string',
                                                                   'description': 'Warranty '
                                                                                  'period'}}}}} (Background on this error at: https://sqlalche.me/e/20/7s2a)
2026-01-22T06:12:17 - filelock - DEBUG - Attempting to acquire lock 247104815048000 on /tmp/gateway_service_leader.lock
```




---

### 🧠 Environment Info
You can retrieve most of this from the `/version` endpoint.

| Key | Value |
|-----|-------|
| Version or commit | `e.g. v0.9.0 or main@a1b2c3d` |
| Runtime | `e.g. Python 3.11, Gunicorn` |
| Platform / OS | `e.g. Ubuntu 22.04, macOS` |
| Container | `e.g. Docker, Podman, none` |

---

### 🧩 Additional Context (optional)
Add any configuration details, flags, or related issues.


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[BUG]: Few MCP servers are not supported - Error when adding gateway #2322

🐞 Bug Summary

🧩 Affected Component

🔁 Steps to Reproduce

🤔 Expected Behavior

📓 Logs / Error Output

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🧩 Additional Context (optional)

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Key	Value
Version or commit	`e.g. v0.9.0 or main@a1b2c3d`
Runtime	`e.g. Python 3.11, Gunicorn`
Platform / OS	`e.g. Ubuntu 22.04, macOS`
Container	`e.g. Docker, Podman, none`

[BUG]: Few MCP servers are not supported - Error when adding gateway #2322

Description

🐞 Bug Summary

🧩 Affected Component

🔁 Steps to Reproduce

🤔 Expected Behavior

📓 Logs / Error Output

🧠 Environment Info

🧩 Additional Context (optional)

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions