diff --git a/.github/workflows/run-integration-tests.yml b/.github/workflows/run-integration-tests.yml
deleted file mode 100644
index 577f6cc11..000000000
--- a/.github/workflows/run-integration-tests.yml
+++ /dev/null
@@ -1,50 +0,0 @@
-name: Run integration tests
-
-env:
-  # enable colored output
-  PY_COLORS: 1
-
-on:
-  push:
-    branches: ["main"]
-    paths:
-      - "src/**"
-      - "integration_tests/**"
-      - "uv.lock"
-      - "pyproject.toml"
-      - ".github/workflows/**"
-
-  # run on all pull requests because these checks are required and will block merges otherwise
-  pull_request:
-
-  workflow_dispatch:
-
-permissions:
-  contents: read
-
-jobs:
-  run_tests:
-    name: "Run tests: Python ${{ matrix.python-version }} on ${{ matrix.os }}"
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest]
-        python-version: ["3.10"]
-      fail-fast: false
-    timeout-minutes: 5
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v5
-        with:
-          enable-cache: true
-          cache-dependency-glob: "uv.lock"
-          python-version: ${{ matrix.python-version }}
-
-      - name: Install FastMCP
-        run: uv sync --locked
-
-      - name: Run tests
-        run: uv run pytest integration_tests
diff --git a/integration_tests/test_repro_518_output.py b/integration_tests/test_repro_518_output.py
deleted file mode 100644
index b82dd03ae..000000000
--- a/integration_tests/test_repro_518_output.py
+++ /dev/null
@@ -1,89 +0,0 @@
-import os
-import subprocess
-import sys
-import tempfile
-import time
-
-import httpx
-import pytest
-
-PYTHON_EXE = sys.executable
-
-SERVER_CODE = """
-import uvicorn
-from fastapi import FastAPI
-from fastmcp import FastMCP
-
-mcp = FastMCP()
-
-@mcp.tool("dummy_tool", "A simple dummy tool for the test server")
-def add(a: int, b: int) -> int:
-    return a + b
-
-app = FastAPI() # Intentionally no lifespan=mcp.lifespan
-app.mount("/", mcp.http_app(transport="streamable-http"))
-
-if __name__ == "__main__":
-    uvicorn.run(app, host="0.0.0.0", port=8080, log_config=None)
-"""
-
-
-@pytest.mark.timeout(20)
-def test_server_shows_informative_error_on_stderr():
-    """
-    Runs a minimal FastMCP+FastAPI server (that omits lifespan wiring)
-    as a subprocess, triggers the error via an HTTP request, and then checks
-    if the server's stderr contains the specific informative error message for issue #518.
-    """
-    process = None
-    captured_stderr = ""
-
-    with tempfile.NamedTemporaryFile(
-        mode="w", suffix=".py", delete=False
-    ) as tmp_script:
-        tmp_script.write(SERVER_CODE)
-        tmp_script_path = tmp_script.name
-
-    try:
-        process = subprocess.Popen(
-            [PYTHON_EXE, "-u", tmp_script_path],
-            stderr=subprocess.PIPE,
-            stdout=subprocess.PIPE,
-            text=True,
-            universal_newlines=True,
-        )
-
-        time.sleep(3)
-
-        if process.poll() is None:
-            try:
-                with httpx.Client(timeout=5.0) as client:
-                    # The mounted FastMCP app is at root, its internal default path is /mcp
-                    client.get("http://localhost:8080/mcp/")
-            except httpx.RequestError:
-                pass
-            time.sleep(1)
-
-    finally:
-        if process:
-            if process.poll() is None:
-                process.terminate()
-            try:
-                _, captured_stderr = process.communicate(timeout=10)
-            except subprocess.TimeoutExpired:
-                process.kill()
-                _, captured_stderr = process.communicate()
-
-        if os.path.exists(tmp_script_path):
-            os.unlink(tmp_script_path)
-
-    assert captured_stderr is not None, "stderr should have been captured"
-    normalized_stderr = captured_stderr.replace("\r\n", "\n").replace("\r", "\n")
-
-    assert (
-        "FastMCP's StreamableHTTPSessionManager task group was not initialized"
-        in normalized_stderr
-    )
-    assert "lifespan=mcp_app.lifespan" in normalized_stderr
-    assert "gofastmcp.com/deployment/asgi" in normalized_stderr
-    assert "Original error: Task group is not initialized" in normalized_stderr
diff --git a/src/fastmcp/utilities/tests.py b/src/fastmcp/utilities/tests.py
index 39bd6b9c7..0d64a1292 100644
--- a/src/fastmcp/utilities/tests.py
+++ b/src/fastmcp/utilities/tests.py
@@ -71,7 +71,7 @@ def _run_server(mcp_server: FastMCP, transport: Literal["sse"], port: int) -> No
 
 @contextmanager
 def run_server_in_process(
-    server_fn: Callable[[str, int], None], *args
+    server_fn: Callable[..., None], *args
 ) -> Generator[str, None, None]:
     """
     Context manager that runs a Starlette app in a separate process and returns the
@@ -109,7 +109,11 @@ def run_server_in_process(
 
     yield f"http://{host}:{port}"
 
-    proc.kill()
-    proc.join(timeout=2)
+    proc.terminate()
+    proc.join(timeout=5)
     if proc.is_alive():
-        raise RuntimeError("Server process failed to terminate")
+        # If it's still alive, then force kill it
+        proc.kill()
+        proc.join(timeout=2)
+        if proc.is_alive():
+            raise RuntimeError("Server process failed to terminate even after kill")
diff --git a/tests/contrib/test_bulk_tool_caller.py b/tests/contrib/test_bulk_tool_caller.py
index 855341912..b6f86c927 100644
--- a/tests/contrib/test_bulk_tool_caller.py
+++ b/tests/contrib/test_bulk_tool_caller.py
@@ -85,7 +85,6 @@ ERROR_TOOL_NAME = "error_tool"
 NO_RETURN_TOOL_NAME = "no_return_tool"
 
 
-@pytest.mark.asyncio
 async def test_call_tool_bulk_single_success(bulk_caller_live: BulkToolCaller):
     """Test single successful call via call_tool_bulk using echo_tool."""
     tool_arguments = [{"arg1": "value1"}]
@@ -98,7 +97,6 @@ async def test_call_tool_bulk_single_success(bulk_caller_live: BulkToolCaller):
     assert result == expected_result
 
 
-@pytest.mark.asyncio
 async def test_call_tool_bulk_multiple_success(bulk_caller_live: BulkToolCaller):
     """Test multiple successful calls via call_tool_bulk using echo_tool."""
     tool_arguments = [{"arg1": "value1"}, {"arg1": "value2"}]
@@ -110,7 +108,6 @@ async def test_call_tool_bulk_multiple_success(bulk_caller_live: BulkToolCaller)
     assert results == expected_results
 
 
-@pytest.mark.asyncio
 async def test_call_tool_bulk_error_stops(bulk_caller_live: BulkToolCaller):
     """Test call_tool_bulk stops on first error using error_tool."""
     tool_arguments = [{"arg1": "error_value"}, {"arg1": "value2"}]
@@ -125,7 +122,6 @@ async def test_call_tool_bulk_error_stops(bulk_caller_live: BulkToolCaller):
     assert result == expected_result
 
 
-@pytest.mark.asyncio
 async def test_call_tool_bulk_error_continues(bulk_caller_live: BulkToolCaller):
     """Test call_tool_bulk continues on error using error_tool and echo_tool."""
     tool_arguments = [{"arg1": "error_value"}, {"arg1": "success_value"}]
@@ -148,7 +144,6 @@ async def test_call_tool_bulk_error_continues(bulk_caller_live: BulkToolCaller):
     assert success_result == expected_success_result
 
 
-@pytest.mark.asyncio
 async def test_call_tools_bulk_single_success(bulk_caller_live: BulkToolCaller):
     """Test single successful call via call_tools_bulk using echo_tool."""
     tool_calls = [CallToolRequest(tool=ECHO_TOOL_NAME, arguments={"arg1": "value1"})]
@@ -161,7 +156,6 @@ async def test_call_tools_bulk_single_success(bulk_caller_live: BulkToolCaller):
     assert result == expected_result
 
 
-@pytest.mark.asyncio
 async def test_call_tools_bulk_multiple_success(bulk_caller_live: BulkToolCaller):
     """Test multiple successful calls via call_tools_bulk with different tools."""
     tool_calls = [
@@ -181,7 +175,6 @@ async def test_call_tools_bulk_multiple_success(bulk_caller_live: BulkToolCaller
     assert results == expected_results
 
 
-@pytest.mark.asyncio
 async def test_call_tools_bulk_error_stops(bulk_caller_live: BulkToolCaller):
     """Test call_tools_bulk stops on first error using error_tool."""
     tool_calls = [
@@ -199,7 +192,6 @@ async def test_call_tools_bulk_error_stops(bulk_caller_live: BulkToolCaller):
     assert result == expected_result
 
 
-@pytest.mark.asyncio
 async def test_call_tools_bulk_error_continues(bulk_caller_live: BulkToolCaller):
     """Test call_tools_bulk continues on error using error_tool and echo_tool."""
     tool_calls = [
diff --git a/tests/server/test_auth_integration.py b/tests/server/test_auth_integration.py
index fb0330dcf..f64bd0843 100644
--- a/tests/server/test_auth_integration.py
+++ b/tests/server/test_auth_integration.py
@@ -341,7 +341,6 @@ async def tokens(test_client, registered_client, auth_code, pkce_challenge, requ
 
 
 class TestAuthEndpoints:
-    @pytest.mark.anyio
     async def test_metadata_endpoint(self, test_client: httpx.AsyncClient):
         """Test the OAuth 2.0 metadata endpoint."""
         print("Sending request to metadata endpoint")
@@ -370,7 +369,6 @@ class TestAuthEndpoints:
         ]
         assert metadata["service_documentation"] == "https://docs.example.com/"
 
-    @pytest.mark.anyio
     async def test_token_validation_error(self, test_client: httpx.AsyncClient):
         """Test token endpoint error - validation error."""
         # Missing required fields
@@ -387,7 +385,6 @@ class TestAuthEndpoints:
             "error_description" in error_response
         )  # Contains validation error messages
 
-    @pytest.mark.anyio
     async def test_token_invalid_auth_code(
         self, test_client, registered_client, pkce_challenge
     ):
@@ -414,7 +411,6 @@ class TestAuthEndpoints:
             "authorization code does not exist" in error_response["error_description"]
         )
 
-    @pytest.mark.anyio
     async def test_token_expired_auth_code(
         self,
         test_client,
@@ -459,7 +455,6 @@ class TestAuthEndpoints:
                 "authorization code has expired" in error_response["error_description"]
             )
 
-    @pytest.mark.anyio
     @pytest.mark.parametrize(
         "registered_client",
         [
@@ -494,7 +489,6 @@ class TestAuthEndpoints:
         assert error_response["error"] == "invalid_request"
         assert "redirect_uri did not match" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_token_code_verifier_mismatch(
         self, test_client, registered_client, auth_code
     ):
@@ -517,7 +511,6 @@ class TestAuthEndpoints:
         assert error_response["error"] == "invalid_grant"
         assert "incorrect code_verifier" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_token_invalid_refresh_token(self, test_client, registered_client):
         """Test token endpoint error - refresh token does not exist."""
         # Try to use a non-existent refresh token
@@ -535,7 +528,6 @@ class TestAuthEndpoints:
         assert error_response["error"] == "invalid_grant"
         assert "refresh token does not exist" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_token_expired_refresh_token(
         self,
         test_client,
@@ -586,7 +578,6 @@ class TestAuthEndpoints:
             assert error_response["error"] == "invalid_grant"
             assert "refresh token has expired" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_token_invalid_scope(
         self, test_client, registered_client, auth_code, pkce_challenge
     ):
@@ -624,7 +615,6 @@ class TestAuthEndpoints:
         assert error_response["error"] == "invalid_scope"
         assert "cannot request scope" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_client_registration(
         self, test_client: httpx.AsyncClient, mock_oauth_provider: MockOAuthProvider
     ):
@@ -652,7 +642,6 @@ class TestAuthEndpoints:
         #     client_info["client_id"]
         # ) is not None
 
-    @pytest.mark.anyio
     async def test_client_registration_missing_required_fields(
         self, test_client: httpx.AsyncClient
     ):
@@ -673,7 +662,6 @@ class TestAuthEndpoints:
         assert error_data["error"] == "invalid_client_metadata"
         assert error_data["error_description"] == "redirect_uris: Field required"
 
-    @pytest.mark.anyio
     async def test_client_registration_invalid_uri(
         self, test_client: httpx.AsyncClient
     ):
@@ -696,7 +684,6 @@ class TestAuthEndpoints:
             "redirect_uris.0: Input should be a valid URL, relative URL without a base"
         )
 
-    @pytest.mark.anyio
     async def test_client_registration_empty_redirect_uris(
         self, test_client: httpx.AsyncClient
     ):
@@ -719,7 +706,6 @@ class TestAuthEndpoints:
             == "redirect_uris: List should have at least 1 item after validation, not 0"
         )
 
-    @pytest.mark.anyio
     async def test_authorize_form_post(
         self,
         test_client: httpx.AsyncClient,
@@ -763,7 +749,6 @@ class TestAuthEndpoints:
         assert "code" in query_params
         assert query_params["state"][0] == "test_form_state"
 
-    @pytest.mark.anyio
     async def test_authorization_get(
         self,
         test_client: httpx.AsyncClient,
@@ -878,7 +863,6 @@ class TestAuthEndpoints:
             is None
         )
 
-    @pytest.mark.anyio
     async def test_revoke_invalid_token(self, test_client, registered_client):
         """Test revoking an invalid token."""
         response = await test_client.post(
@@ -892,7 +876,6 @@ class TestAuthEndpoints:
         # per RFC, this should return 200 even if the token is invalid
         assert response.status_code == 200
 
-    @pytest.mark.anyio
     async def test_revoke_with_malformed_token(self, test_client, registered_client):
         response = await test_client.post(
             "/revoke",
@@ -908,7 +891,6 @@ class TestAuthEndpoints:
         assert error_response["error"] == "invalid_request"
         assert "token_type_hint" in error_response["error_description"]
 
-    @pytest.mark.anyio
     async def test_client_registration_disallowed_scopes(
         self, test_client: httpx.AsyncClient
     ):
@@ -930,7 +912,6 @@ class TestAuthEndpoints:
         assert "scope" in error_data["error_description"]
         assert "admin" in error_data["error_description"]
 
-    @pytest.mark.anyio
     async def test_client_registration_default_scopes(
         self, test_client: httpx.AsyncClient, mock_oauth_provider: MockOAuthProvider
     ):
@@ -959,7 +940,6 @@ class TestAuthEndpoints:
         # Check that default scopes were applied
         assert registered_client.scope == "read write"
 
-    @pytest.mark.anyio
     async def test_client_registration_invalid_grant_type(
         self, test_client: httpx.AsyncClient
     ):
@@ -986,7 +966,6 @@ class TestAuthEndpoints:
 class TestAuthorizeEndpointErrors:
     """Test error handling in the OAuth authorization endpoint."""
 
-    @pytest.mark.anyio
     async def test_authorize_missing_client_id(
         self, test_client: httpx.AsyncClient, pkce_challenge
     ):
@@ -1012,7 +991,6 @@ class TestAuthorizeEndpointErrors:
         # The response should include an error message about missing client_id
         assert "client_id" in response.text.lower()
 
-    @pytest.mark.anyio
     async def test_authorize_invalid_client_id(
         self, test_client: httpx.AsyncClient, pkce_challenge
     ):
@@ -1038,7 +1016,6 @@ class TestAuthorizeEndpointErrors:
         # The response should include an error message about invalid client_id
         assert "client" in response.text.lower()
 
-    @pytest.mark.anyio
     async def test_authorize_missing_redirect_uri(
         self, test_client: httpx.AsyncClient, registered_client, pkce_challenge
     ):
@@ -1064,7 +1041,6 @@ class TestAuthorizeEndpointErrors:
         redirect_url = response.headers["location"]
         assert redirect_url.startswith("https://client.example.com/callback")
 
-    @pytest.mark.anyio
     async def test_authorize_invalid_redirect_uri(
         self, test_client: httpx.AsyncClient, registered_client, pkce_challenge
     ):
@@ -1092,7 +1068,6 @@ class TestAuthorizeEndpointErrors:
         # The response should include an error message about redirect_uri mismatch
         assert "redirect" in response.text.lower()
 
-    @pytest.mark.anyio
     @pytest.mark.parametrize(
         "registered_client",
         [
@@ -1130,7 +1105,6 @@ class TestAuthorizeEndpointErrors:
         # The response should include an error message about missing redirect_uri
         assert "redirect_uri" in response.text.lower()
 
-    @pytest.mark.anyio
     async def test_authorize_unsupported_response_type(
         self, test_client: httpx.AsyncClient, registered_client, pkce_challenge
     ):
@@ -1164,7 +1138,6 @@ class TestAuthorizeEndpointErrors:
         assert "state" in query_params
         assert query_params["state"][0] == "test_state"
 
-    @pytest.mark.anyio
     async def test_authorize_missing_response_type(
         self, test_client: httpx.AsyncClient, registered_client, pkce_challenge
     ):
@@ -1197,7 +1170,6 @@ class TestAuthorizeEndpointErrors:
         assert "state" in query_params
         assert query_params["state"][0] == "test_state"
 
-    @pytest.mark.anyio
     async def test_authorize_missing_pkce_challenge(
         self, test_client: httpx.AsyncClient, registered_client
     ):
@@ -1228,7 +1200,6 @@ class TestAuthorizeEndpointErrors:
         assert "state" in query_params
         assert query_params["state"][0] == "test_state"
 
-    @pytest.mark.anyio
     async def test_authorize_invalid_scope(
         self, test_client: httpx.AsyncClient, registered_client, pkce_challenge
     ):
diff --git a/tests/server/test_http_middleware.py b/tests/server/test_http_middleware.py
index e48dc127b..7a1ab22f4 100644
--- a/tests/server/test_http_middleware.py
+++ b/tests/server/test_http_middleware.py
@@ -4,7 +4,6 @@ from collections.abc import Callable
 from typing import Any
 
 import httpx
-import pytest
 from httpx import ASGITransport
 from starlette.middleware import Middleware
 from starlette.middleware.base import BaseHTTPMiddleware
@@ -51,7 +50,6 @@ async def endpoint_handler(request: Request):
     return JSONResponse({"message": "Hello, world!"})
 
 
-@pytest.mark.asyncio
 async def test_sse_app_with_custom_middleware():
     """Test that custom middleware works with SSE app."""
     server = FastMCP(name="TestServer")
@@ -82,7 +80,6 @@ async def test_sse_app_with_custom_middleware():
         assert response.headers["X-Custom-Header"] == "test-value"
 
 
-@pytest.mark.asyncio
 async def test_streamable_http_app_with_custom_middleware():
     """Test that custom middleware works with StreamableHTTP app."""
     server = FastMCP(name="TestServer")
@@ -113,7 +110,6 @@ async def test_streamable_http_app_with_custom_middleware():
         assert response.headers["X-Custom-Header"] == "test-value"
 
 
-@pytest.mark.asyncio
 async def test_create_sse_app_with_custom_middleware():
     """Test that custom middleware works with create_sse_app function."""
     server = FastMCP(name="TestServer")
@@ -149,7 +145,6 @@ async def test_create_sse_app_with_custom_middleware():
         assert data["state"]["modified_by"] == "middleware"
 
 
-@pytest.mark.asyncio
 async def test_create_streamable_http_app_with_custom_middleware():
     """Test that custom middleware works with create_streamable_http_app function."""
     server = FastMCP(name="TestServer")
@@ -184,7 +179,6 @@ async def test_create_streamable_http_app_with_custom_middleware():
         assert data["state"]["modified_by"] == "middleware"
 
 
-@pytest.mark.asyncio
 async def test_multiple_middleware_ordering():
     """Test that multiple middleware are applied in the correct order."""
     server = FastMCP(name="TestServer")
diff --git a/tests/server/test_lifespan.py b/tests/server/test_lifespan.py
index 8b11ca825..ad041bbf9 100644
--- a/tests/server/test_lifespan.py
+++ b/tests/server/test_lifespan.py
@@ -1,10 +1,15 @@
 """Tests for lifespan functionality in both low-level and FastMCP servers."""
 
+import os
+import sys
+import traceback
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
+from pathlib import Path
 
 import anyio
-import pytest
+import httpx
+import uvicorn
 from mcp.server.lowlevel.server import NotificationOptions, Server
 from mcp.server.models import InitializationOptions
 from mcp.shared.message import SessionMessage
@@ -17,11 +22,13 @@ from mcp.types import (
     JSONRPCRequest,
 )
 from pydantic import TypeAdapter
+from starlette.applications import Starlette
+from starlette.routing import Mount
 
 from fastmcp import Context, FastMCP
+from fastmcp.utilities.tests import run_server_in_process
 
 
-@pytest.mark.anyio
 async def test_lowlevel_server_lifespan():
     """Test that lifespan works in low-level server."""
 
@@ -132,7 +139,6 @@ async def test_lowlevel_server_lifespan():
         tg.cancel_scope.cancel()
 
 
-@pytest.mark.anyio
 async def test_fastmcp_server_lifespan():
     """Test that lifespan works in FastMCP server."""
 
@@ -234,3 +240,157 @@ async def test_fastmcp_server_lifespan():
 
         # Cancel server task
         tg.cancel_scope.cancel()
+
+
+def run_server_with_incorrect_lifespan_setup(
+    host: str, port: int, server_log_file_path: str
+) -> None:
+    os.makedirs(os.path.dirname(server_log_file_path), exist_ok=True)
+
+    CUSTOM_LOGGING_CONFIG = {
+        "version": 1,
+        "disable_existing_loggers": False,
+        "formatters": {
+            "default": {
+                "()": "uvicorn.logging.DefaultFormatter",
+                "fmt": "%(levelprefix)s %(asctime)s [%(name)s] %(message)s",
+                "datefmt": "%Y-%m-%d %H:%M:%S",
+                "use_colors": False,
+            },
+            "access": {
+                "()": "uvicorn.logging.AccessFormatter",
+                "fmt": '%(levelprefix)s %(asctime)s [%(name)s] %(client_addr)s - "%(request_line)s" %(status_code)s',
+                "datefmt": "%Y-%m-%d %H:%M:%S",
+                "use_colors": False,
+            },
+        },
+        "handlers": {
+            "file_default": {
+                "formatter": "default",
+                "class": "logging.FileHandler",
+                "filename": server_log_file_path,
+                "mode": "w",
+            },
+            "file_access": {
+                "formatter": "access",
+                "class": "logging.FileHandler",
+                "filename": server_log_file_path,
+                "mode": "a",
+            },
+        },
+        "loggers": {
+            "uvicorn": {  # Catches uvicorn root logs
+                "handlers": ["file_default"],
+                "level": "DEBUG",
+                "propagate": False,
+            },
+            "uvicorn.error": {
+                "handlers": ["file_default"],
+                "level": "DEBUG",
+                "propagate": False,
+            },
+            "uvicorn.access": {
+                "handlers": ["file_access"],
+                "level": "INFO",
+                "propagate": False,
+            },
+        },
+        "root": {
+            "handlers": ["file_default"],
+            "level": "DEBUG",
+        },
+    }
+
+    try:
+        mcp = FastMCP()
+
+        @mcp.tool("ping_tool", "A simple ping tool for the test server")
+        def ping_tool() -> str:
+            return "pong"
+
+        mcp_asgi_app = mcp.http_app(transport="streamable-http")
+
+        parent_app = Starlette(
+            routes=[Mount("/mounted_mcp", app=mcp_asgi_app)],
+        )
+
+        uvicorn.run(
+            parent_app,
+            host=host,
+            port=port,
+            log_config=CUSTOM_LOGGING_CONFIG,
+            log_level=None,
+        )
+        sys.exit(0)
+    except Exception as e_outer:
+        with open(server_log_file_path, "a") as f_fallback:
+            f_fallback.write(
+                "--- FALLBACK EXCEPTION IN SERVER RUNNER (PRE-UVICORN) ---\n"
+            )
+            f_fallback.write(f"{type(e_outer).__name__}: {e_outer}\n")
+            f_fallback.write(traceback.format_exc())
+        sys.exit(1)
+
+
+async def test_missing_lifespan_logs_informative_error(tmp_path: Path):
+    server_log_file = tmp_path / "server.log"
+
+    with run_server_in_process(
+        run_server_with_incorrect_lifespan_setup, str(server_log_file)
+    ) as server_url:
+        full_mcp_path = server_url + "/mounted_mcp/mcp/"
+
+        client_triggered_error = False
+        response_status = -1
+        response_body = ""
+        try:
+            async with httpx.AsyncClient(timeout=10) as client:
+                response = await client.post(
+                    full_mcp_path,
+                    json={"id": 1, "method": "list_tools", "jsonrpc": "2.0"},
+                )
+            response_status = response.status_code
+            response_body = response.text
+            if response.status_code == 500:
+                client_triggered_error = True
+            else:
+                print(
+                    f"Client received unexpected status code: {response.status_code} "
+                    f"Response: {response_body[:500]}"
+                )
+        except httpx.RequestError as e:
+            print(f"Client request failed with RequestError: {e}")
+            client_triggered_error = True
+
+        assert client_triggered_error, (
+            f"Client request did not result in a 500 error or a request error. "
+            f"Status: {response_status}, Body: {response_body[:500]}"
+        )
+
+    assert server_log_file.exists(), (
+        f"Server log file was not created at {server_log_file}"
+    )
+    log_content = server_log_file.read_text()
+
+    print(f"--- Captured Server Log Content ({server_log_file}) ---")
+    print(log_content)
+    print("--- End Server Log Content ---")
+
+    # Core assertions for the enhanced error message
+    assert (
+        "FastMCP's StreamableHTTPSessionManager task group was not initialized"
+        in log_content
+    )
+    assert "lifespan=mcp_app.lifespan" in log_content
+    assert "gofastmcp.com/deployment/asgi" in log_content
+    assert "Original error: Task group is not initialized" in log_content
+
+    # Check for Uvicorn's own error logging wrapper for the request
+    assert "ERROR" in log_content  # General check for ERROR level logs
+    assert "Exception in ASGI application" in log_content
+
+    # Sanity checks for server operation and logging setup
+    assert "Uvicorn running on" in log_content
+    assert (
+        "--- FALLBACK EXCEPTION IN SERVER RUNNER (PRE-UVICORN) ---" not in log_content
+    )
diff --git a/tests/server/test_openapi_path_parameters.py b/tests/server/test_openapi_path_parameters.py
index e8b6121e5..9940594a8 100644
--- a/tests/server/test_openapi_path_parameters.py
+++ b/tests/server/test_openapi_path_parameters.py
@@ -87,7 +87,6 @@ async def test_fastmcp_from_openapi(array_path_spec, mock_client):
     assert "test-operation" in tool_names
 
 
-@pytest.mark.asyncio
 async def test_array_path_parameter_handling(mock_client):
     """Test how array path parameters are handled."""
     # Create a simple route with array path parameter
@@ -158,7 +157,6 @@ async def test_array_path_parameter_handling(mock_client):
     )
 
 
-@pytest.mark.asyncio
 async def test_integration_array_path_parameter(array_path_spec, mock_client):
     """Integration test for array path parameters."""
     # Create FastMCP from the spec
@@ -192,7 +190,6 @@ async def test_integration_array_path_parameter(array_path_spec, mock_client):
     )
 
 
-@pytest.mark.asyncio
 async def test_complex_nested_array_path_parameter(mock_client):
     """Test handling of complex nested array path parameters."""
     # Create a route with a path parameter that contains nested objects in an array
@@ -262,7 +259,6 @@ async def test_complex_nested_array_path_parameter(mock_client):
     assert "{" not in called_url, "The URL should not contain Python object syntax"
 
 
-@pytest.mark.asyncio
 async def test_array_query_param_with_fastapi():
     """Test array query parameters using FastAPI and FastMCP.from_fastapi integration."""
     # Create a FastAPI app with a route that has an array query parameter
@@ -323,7 +319,6 @@ async def test_array_query_param_with_fastapi():
         assert result_data == {"selected": ["monday", "tuesday"]}
 
 
-@pytest.mark.asyncio
 async def test_array_query_parameter_format(mock_client):
     """Test that array query parameters are formatted as comma-separated values when explode=False."""
     # Create a route with array query parameter
@@ -394,7 +389,6 @@ async def test_array_query_parameter_format(mock_client):
     )
 
 
-@pytest.mark.asyncio
 async def test_array_query_parameter_exploded_format(mock_client):
     """Test that array query parameters are formatted as separate parameters when explode=True."""
     # Create a route with array query parameter with explode=True (default)
diff --git a/tests/test_deprecated.py b/tests/test_deprecated.py
index ecb63bc8e..65f6fc71d 100644
--- a/tests/test_deprecated.py
+++ b/tests/test_deprecated.py
@@ -40,7 +40,6 @@ def test_streamable_http_app_deprecation_warning():
         assert isinstance(app, Starlette)
 
 
-@pytest.mark.asyncio
 async def test_run_sse_async_deprecation_warning():
     """Test that run_sse_async raises a deprecation warning."""
     server = FastMCP("TestServer")
@@ -58,7 +57,6 @@ async def test_run_sse_async_deprecation_warning():
         assert call_kwargs.get("transport") == "sse"
 
 
-@pytest.mark.asyncio
 async def test_run_streamable_http_async_deprecation_warning():
     """Test that run_streamable_http_async raises a deprecation warning."""
     server = FastMCP("TestServer")
diff --git a/tests/test_examples.py b/tests/test_examples.py
index 1f68390d8..fcee6c521 100644
--- a/tests/test_examples.py
+++ b/tests/test_examples.py
@@ -1,6 +1,5 @@
 """Tests for example servers"""
 
-import pytest
 from mcp.types import (
     PromptMessage,
     TextContent,
@@ -11,7 +10,6 @@ from pydantic import AnyUrl
 from fastmcp import Client
 
 
-@pytest.mark.anyio
 async def test_simple_echo():
     """Test the simple echo server"""
     from examples.simple_echo import mcp
@@ -23,7 +21,6 @@ async def test_simple_echo():
         assert result[0].text == "hello"
 
 
-@pytest.mark.anyio
 async def test_complex_inputs():
     """Test the complex inputs server"""
     from examples.complex_inputs import mcp
@@ -38,7 +35,6 @@ async def test_complex_inputs():
         assert result[0].text == '[\n  "bob",\n  "alice",\n  "charlie"\n]'
 
 
-@pytest.mark.anyio
 async def test_desktop(monkeypatch):
     """Test the desktop server"""
     from examples.desktop import mcp
@@ -58,7 +54,6 @@ async def test_desktop(monkeypatch):
         assert result[0].text == "Hello, rooter12!"
 
 
-@pytest.mark.anyio
 async def test_echo():
     """Test the echo server"""
     from examples.echo import mcp