modelcontextprotocol--python-sdk/tests/server/mcpserver/test_server.py

import base64
from pathlib import Path
from typing import Any
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from inline_snapshot import snapshot
from pydantic import BaseModel
from starlette.applications import Starlette
from starlette.routing import Mount, Route

from mcp.client import Client
from mcp.server.context import ServerRequestContext
from mcp.server.mcpserver import Context, MCPServer
from mcp.server.mcpserver.exceptions import ToolError
from mcp.server.mcpserver.prompts.base import Message, UserMessage
from mcp.server.mcpserver.resources import FileResource, FunctionResource
from mcp.server.mcpserver.utilities.types import Audio, Image
from mcp.server.transport_security import TransportSecuritySettings
from mcp.shared.exceptions import MCPError
from mcp.types import (
    AudioContent,
    BlobResourceContents,
    Completion,
    CompletionArgument,
    CompletionContext,
    ContentBlock,
    EmbeddedResource,
    GetPromptResult,
    Icon,
    ImageContent,
    ListPromptsResult,
    Prompt,
    PromptArgument,
    PromptMessage,
    PromptReference,
    ReadResourceResult,
    Resource,
    ResourceTemplate,
    TextContent,
    TextResourceContents,
)

pytestmark = pytest.mark.anyio


class TestServer:
    async def test_create_server(self):
        mcp = MCPServer(
            title="MCPServer Server",
            description="Server description",
            instructions="Server instructions",
            website_url="https://example.com/mcp_server",
            version="1.0",
            icons=[Icon(src="https://example.com/icon.png", mime_type="image/png", sizes=["48x48", "96x96"])],
        )
        assert mcp.name == "mcp-server"
        assert mcp.title == "MCPServer Server"
        assert mcp.description == "Server description"
        assert mcp.instructions == "Server instructions"
        assert mcp.website_url == "https://example.com/mcp_server"
        assert mcp.version == "1.0"
        assert isinstance(mcp.icons, list)
        assert len(mcp.icons) == 1
        assert mcp.icons[0].src == "https://example.com/icon.png"

    def test_dependencies(self):
        """Dependencies list is read by `mcp install` / `mcp dev` CLI commands."""
        mcp = MCPServer("test", dependencies=["pandas", "numpy"])
        assert mcp.dependencies == ["pandas", "numpy"]
        assert mcp.settings.dependencies == ["pandas", "numpy"]

        mcp_no_deps = MCPServer("test")
        assert mcp_no_deps.dependencies == []

    async def test_sse_app_returns_starlette_app(self):
        """Test that sse_app returns a Starlette application with correct routes."""
        mcp = MCPServer("test")
        # Use host="0.0.0.0" to avoid auto DNS protection
        app = mcp.sse_app(host="0.0.0.0")

        assert isinstance(app, Starlette)

        # Verify routes exist
        sse_routes = [r for r in app.routes if isinstance(r, Route)]
        mount_routes = [r for r in app.routes if isinstance(r, Mount)]

        assert len(sse_routes) == 1, "Should have one SSE route"
        assert len(mount_routes) == 1, "Should have one mount route"
        assert sse_routes[0].path == "/sse"
        assert mount_routes[0].path == "/messages"

    async def test_non_ascii_description(self):
        """Test that MCPServer handles non-ASCII characters in descriptions correctly"""
        mcp = MCPServer()

        @mcp.tool(description=("🌟 This tool uses emojis and UTF-8 characters: á é í ó ú ñ 漢字 🎉"))
        def hello_world(name: str = "世界") -> str:
            return f"¡Hola, {name}! 👋"

        async with Client(mcp) as client:
            tools = await client.list_tools()
            assert len(tools.tools) == 1
            tool = tools.tools[0]
            assert tool.description is not None
            assert "🌟" in tool.description
            assert "漢字" in tool.description
            assert "🎉" in tool.description

            result = await client.call_tool("hello_world", {})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "¡Hola, 世界! 👋" == content.text

    async def test_add_tool_decorator(self):
        mcp = MCPServer()

        @mcp.tool()
        def sum(x: int, y: int) -> int:  # pragma: no cover
            return x + y

        assert len(mcp._tool_manager.list_tools()) == 1

    async def test_add_tool_decorator_incorrect_usage(self):
        mcp = MCPServer()

        with pytest.raises(TypeError, match="The @tool decorator was used incorrectly"):

            @mcp.tool  # Missing parentheses #type: ignore
            def sum(x: int, y: int) -> int:  # pragma: no cover
                return x + y

    async def test_add_resource_decorator(self):
        mcp = MCPServer()

        @mcp.resource("r://{x}")
        def get_data(x: str) -> str:  # pragma: no cover
            return f"Data: {x}"

        assert len(mcp._resource_manager._templates) == 1

    async def test_add_resource_decorator_incorrect_usage(self):
        mcp = MCPServer()

        with pytest.raises(TypeError, match="The @resource decorator was used incorrectly"):

            @mcp.resource  # Missing parentheses #type: ignore
            def get_data(x: str) -> str:  # pragma: no cover
                return f"Data: {x}"


class TestDnsRebindingProtection:
    """Tests for automatic DNS rebinding protection on localhost.

    DNS rebinding protection is now configured in sse_app() and streamable_http_app()
    based on the host parameter passed to those methods.
    """

    def test_auto_enabled_for_127_0_0_1_sse(self):
        """DNS rebinding protection should auto-enable for host=127.0.0.1 in SSE app."""
        mcp = MCPServer()
        # Call sse_app with host=127.0.0.1 to trigger auto-config
        # We can't directly inspect the transport_security, but we can verify
        # the app is created without error
        app = mcp.sse_app(host="127.0.0.1")
        assert app is not None

    def test_auto_enabled_for_127_0_0_1_streamable_http(self):
        """DNS rebinding protection should auto-enable for host=127.0.0.1 in StreamableHTTP app."""
        mcp = MCPServer()
        app = mcp.streamable_http_app(host="127.0.0.1")
        assert app is not None

    def test_auto_enabled_for_localhost_sse(self):
        """DNS rebinding protection should auto-enable for host=localhost in SSE app."""
        mcp = MCPServer()
        app = mcp.sse_app(host="localhost")
        assert app is not None

    def test_auto_enabled_for_ipv6_localhost_sse(self):
        """DNS rebinding protection should auto-enable for host=::1 (IPv6 localhost) in SSE app."""
        mcp = MCPServer()
        app = mcp.sse_app(host="::1")
        assert app is not None

    def test_not_auto_enabled_for_other_hosts_sse(self):
        """DNS rebinding protection should NOT auto-enable for other hosts in SSE app."""
        mcp = MCPServer()
        app = mcp.sse_app(host="0.0.0.0")
        assert app is not None

    def test_explicit_settings_not_overridden_sse(self):
        """Explicit transport_security settings should not be overridden in SSE app."""
        custom_settings = TransportSecuritySettings(
            enable_dns_rebinding_protection=False,
        )
        mcp = MCPServer()
        # Explicit transport_security passed to sse_app should be used as-is
        app = mcp.sse_app(host="127.0.0.1", transport_security=custom_settings)
        assert app is not None

    def test_explicit_settings_not_overridden_streamable_http(self):
        """Explicit transport_security settings should not be overridden in StreamableHTTP app."""
        custom_settings = TransportSecuritySettings(
            enable_dns_rebinding_protection=False,
        )
        mcp = MCPServer()
        # Explicit transport_security passed to streamable_http_app should be used as-is
        app = mcp.streamable_http_app(host="127.0.0.1", transport_security=custom_settings)
        assert app is not None


def tool_fn(x: int, y: int) -> int:
    return x + y


def error_tool_fn() -> None:
    raise ValueError("Test error")


def image_tool_fn(path: str) -> Image:
    return Image(path)


def audio_tool_fn(path: str) -> Audio:
    return Audio(path)


def mixed_content_tool_fn() -> list[ContentBlock]:
    return [
        TextContent(type="text", text="Hello"),
        ImageContent(type="image", data="abc", mime_type="image/png"),
        AudioContent(type="audio", data="def", mime_type="audio/wav"),
    ]


class TestServerTools:
    async def test_add_tool(self):
        mcp = MCPServer()
        mcp.add_tool(tool_fn)
        mcp.add_tool(tool_fn)
        assert len(mcp._tool_manager.list_tools()) == 1

    async def test_list_tools(self):
        mcp = MCPServer()
        mcp.add_tool(tool_fn)
        async with Client(mcp) as client:
            tools = await client.list_tools()
            assert len(tools.tools) == 1

    async def test_call_tool(self):
        mcp = MCPServer()
        mcp.add_tool(tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("my_tool", {"arg1": "value"})
            assert not hasattr(result, "error")
            assert len(result.content) > 0

    async def test_tool_exception_handling(self):
        mcp = MCPServer()
        mcp.add_tool(error_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("error_tool_fn", {})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Test error" in content.text
            assert result.is_error is True

    async def test_tool_error_handling(self):
        mcp = MCPServer()
        mcp.add_tool(error_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("error_tool_fn", {})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Test error" in content.text
            assert result.is_error is True

    async def test_tool_error_details(self):
        """Test that exception details are properly formatted in the response"""
        mcp = MCPServer()
        mcp.add_tool(error_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("error_tool_fn", {})
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert isinstance(content.text, str)
            assert "Test error" in content.text
            assert result.is_error is True

    async def test_tool_return_value_conversion(self):
        mcp = MCPServer()
        mcp.add_tool(tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("tool_fn", {"x": 1, "y": 2})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert content.text == "3"
            # Check structured content - int return type should have structured output
            assert result.structured_content is not None
            assert result.structured_content == {"result": 3}

    async def test_tool_image_helper(self, tmp_path: Path):
        # Create a test image
        image_path = tmp_path / "test.png"
        image_path.write_bytes(b"fake png data")

        mcp = MCPServer()
        mcp.add_tool(image_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("image_tool_fn", {"path": str(image_path)})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, ImageContent)
            assert content.type == "image"
            assert content.mime_type == "image/png"
            # Verify base64 encoding
            decoded = base64.b64decode(content.data)
            assert decoded == b"fake png data"
            # Check structured content - Image return type should NOT have structured output
            assert result.structured_content is None

    async def test_tool_audio_helper(self, tmp_path: Path):
        # Create a test audio
        audio_path = tmp_path / "test.wav"
        audio_path.write_bytes(b"fake wav data")

        mcp = MCPServer()
        mcp.add_tool(audio_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("audio_tool_fn", {"path": str(audio_path)})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, AudioContent)
            assert content.type == "audio"
            assert content.mime_type == "audio/wav"
            # Verify base64 encoding
            decoded = base64.b64decode(content.data)
            assert decoded == b"fake wav data"
            # Check structured content - Image return type should NOT have structured output
            assert result.structured_content is None

    @pytest.mark.parametrize(
        "filename,expected_mime_type",
        [
            ("test.wav", "audio/wav"),
            ("test.mp3", "audio/mpeg"),
            ("test.ogg", "audio/ogg"),
            ("test.flac", "audio/flac"),
            ("test.aac", "audio/aac"),
            ("test.m4a", "audio/mp4"),
            ("test.unknown", "application/octet-stream"),  # Unknown extension fallback
        ],
    )
    async def test_tool_audio_suffix_detection(self, tmp_path: Path, filename: str, expected_mime_type: str):
        """Test that Audio helper correctly detects MIME types from file suffixes"""
        mcp = MCPServer()
        mcp.add_tool(audio_tool_fn)

        # Create a test audio file with the specific extension
        audio_path = tmp_path / filename
        audio_path.write_bytes(b"fake audio data")

        async with Client(mcp) as client:
            result = await client.call_tool("audio_tool_fn", {"path": str(audio_path)})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, AudioContent)
            assert content.type == "audio"
            assert content.mime_type == expected_mime_type
            # Verify base64 encoding
            decoded = base64.b64decode(content.data)
            assert decoded == b"fake audio data"

    async def test_tool_mixed_content(self):
        mcp = MCPServer()
        mcp.add_tool(mixed_content_tool_fn)
        async with Client(mcp) as client:
            result = await client.call_tool("mixed_content_tool_fn", {})
            assert len(result.content) == 3
            content1, content2, content3 = result.content
            assert isinstance(content1, TextContent)
            assert content1.text == "Hello"
            assert isinstance(content2, ImageContent)
            assert content2.mime_type == "image/png"
            assert content2.data == "abc"
            assert isinstance(content3, AudioContent)
            assert content3.mime_type == "audio/wav"
            assert content3.data == "def"
            assert result.structured_content is not None
            assert "result" in result.structured_content
            structured_result = result.structured_content["result"]
            assert len(structured_result) == 3

            expected_content = [
                {"type": "text", "text": "Hello"},
                {"type": "image", "data": "abc", "mimeType": "image/png"},
                {"type": "audio", "data": "def", "mimeType": "audio/wav"},
            ]

            for i, expected in enumerate(expected_content):
                for key, value in expected.items():
                    assert structured_result[i][key] == value

    async def test_tool_mixed_list_with_audio_and_image(self, tmp_path: Path):
        """Test that lists containing Image objects and other types are handled
        correctly"""
        # Create a test image
        image_path = tmp_path / "test.png"
        image_path.write_bytes(b"test image data")

        # Create a test audio
        audio_path = tmp_path / "test.wav"
        audio_path.write_bytes(b"test audio data")

        # TODO(Marcelo): It seems if we add the proper type hint, it generates an invalid JSON schema.
        # We need to fix this.
        def mixed_list_fn() -> list:  # type: ignore
            return [  # type: ignore
                "text message",
                Image(image_path),
                Audio(audio_path),
                {"key": "value"},
                TextContent(type="text", text="direct content"),
            ]

        mcp = MCPServer()
        mcp.add_tool(mixed_list_fn)  # type: ignore
        async with Client(mcp) as client:
            result = await client.call_tool("mixed_list_fn", {})
            assert len(result.content) == 5
            # Check text conversion
            content1 = result.content[0]
            assert isinstance(content1, TextContent)
            assert content1.text == "text message"
            # Check image conversion
            content2 = result.content[1]
            assert isinstance(content2, ImageContent)
            assert content2.mime_type == "image/png"
            assert base64.b64decode(content2.data) == b"test image data"
            # Check audio conversion
            content3 = result.content[2]
            assert isinstance(content3, AudioContent)
            assert content3.mime_type == "audio/wav"
            assert base64.b64decode(content3.data) == b"test audio data"
            # Check dict conversion
            content4 = result.content[3]
            assert isinstance(content4, TextContent)
            assert '"key": "value"' in content4.text
            # Check direct TextContent
            content5 = result.content[4]
            assert isinstance(content5, TextContent)
            assert content5.text == "direct content"
            # Check structured content - untyped list with Image objects should NOT have structured output
            assert result.structured_content is None

    async def test_tool_structured_output_basemodel(self):
        """Test tool with structured output returning BaseModel"""

        class UserOutput(BaseModel):
            name: str
            age: int
            active: bool = True

        def get_user(user_id: int) -> UserOutput:
            """Get user by ID"""
            return UserOutput(name="John Doe", age=30)

        mcp = MCPServer()
        mcp.add_tool(get_user)

        async with Client(mcp) as client:
            # Check that the tool has outputSchema
            tools = await client.list_tools()
            tool = next(t for t in tools.tools if t.name == "get_user")
            assert tool.output_schema is not None
            assert tool.output_schema["type"] == "object"
            assert "name" in tool.output_schema["properties"]
            assert "age" in tool.output_schema["properties"]

            # Call the tool and check structured output
            result = await client.call_tool("get_user", {"user_id": 123})
            assert result.is_error is False
            assert result.structured_content is not None
            assert result.structured_content == {"name": "John Doe", "age": 30, "active": True}
            # Content should be JSON serialized version
            assert len(result.content) == 1
            assert isinstance(result.content[0], TextContent)
            assert '"name": "John Doe"' in result.content[0].text

    async def test_tool_structured_output_primitive(self):
        """Test tool with structured output returning primitive type"""

        def calculate_sum(a: int, b: int) -> int:
            """Add two numbers"""
            return a + b

        mcp = MCPServer()
        mcp.add_tool(calculate_sum)

        async with Client(mcp) as client:
            # Check that the tool has outputSchema
            tools = await client.list_tools()
            tool = next(t for t in tools.tools if t.name == "calculate_sum")
            assert tool.output_schema is not None
            # Primitive types are wrapped
            assert tool.output_schema["type"] == "object"
            assert "result" in tool.output_schema["properties"]
            assert tool.output_schema["properties"]["result"]["type"] == "integer"

            # Call the tool
            result = await client.call_tool("calculate_sum", {"a": 5, "b": 7})
            assert result.is_error is False
            assert result.structured_content is not None
            assert result.structured_content == {"result": 12}

    async def test_tool_structured_output_list(self):
        """Test tool with structured output returning list"""

        def get_numbers() -> list[int]:
            """Get a list of numbers"""
            return [1, 2, 3, 4, 5]

        mcp = MCPServer()
        mcp.add_tool(get_numbers)

        async with Client(mcp) as client:
            result = await client.call_tool("get_numbers", {})
            assert result.is_error is False
            assert result.structured_content is not None
            assert result.structured_content == {"result": [1, 2, 3, 4, 5]}

    async def test_tool_structured_output_server_side_validation_error(self):
        """Test that server-side validation errors are handled properly"""

        def get_numbers() -> list[int]:
            return [1, 2, 3, 4, [5]]  # type: ignore

        mcp = MCPServer()
        mcp.add_tool(get_numbers)

        async with Client(mcp) as client:
            result = await client.call_tool("get_numbers", {})
            assert result.is_error is True
            assert result.structured_content is None
            assert len(result.content) == 1
            assert isinstance(result.content[0], TextContent)

    async def test_tool_structured_output_dict_str_any(self):
        """Test tool with dict[str, Any] structured output"""

        def get_metadata() -> dict[str, Any]:
            """Get metadata dictionary"""
            return {
                "version": "1.0.0",
                "enabled": True,
                "count": 42,
                "tags": ["production", "stable"],
                "config": {"nested": {"value": 123}},
            }

        mcp = MCPServer()
        mcp.add_tool(get_metadata)

        async with Client(mcp) as client:
            # Check schema
            tools = await client.list_tools()
            tool = next(t for t in tools.tools if t.name == "get_metadata")
            assert tool.output_schema is not None
            assert tool.output_schema["type"] == "object"
            # dict[str, Any] should have minimal schema
            assert (
                "additionalProperties" not in tool.output_schema
                or tool.output_schema.get("additionalProperties") is True
            )

            # Call tool
            result = await client.call_tool("get_metadata", {})
            assert result.is_error is False
            assert result.structured_content is not None
            expected = {
                "version": "1.0.0",
                "enabled": True,
                "count": 42,
                "tags": ["production", "stable"],
                "config": {"nested": {"value": 123}},
            }
            assert result.structured_content == expected

    async def test_tool_structured_output_dict_str_typed(self):
        """Test tool with dict[str, T] structured output for specific T"""

        def get_settings() -> dict[str, str]:
            """Get settings as string dictionary"""
            return {"theme": "dark", "language": "en", "timezone": "UTC"}

        mcp = MCPServer()
        mcp.add_tool(get_settings)

        async with Client(mcp) as client:
            # Check schema
            tools = await client.list_tools()
            tool = next(t for t in tools.tools if t.name == "get_settings")
            assert tool.output_schema is not None
            assert tool.output_schema["type"] == "object"
            assert tool.output_schema["additionalProperties"]["type"] == "string"

            # Call tool
            result = await client.call_tool("get_settings", {})
            assert result.is_error is False
            assert result.structured_content == {"theme": "dark", "language": "en", "timezone": "UTC"}

    async def test_remove_tool(self):
        """Test removing a tool from the server."""
        mcp = MCPServer()
        mcp.add_tool(tool_fn)

        # Verify tool exists
        assert len(mcp._tool_manager.list_tools()) == 1

        # Remove the tool
        mcp.remove_tool("tool_fn")

        # Verify tool is removed
        assert len(mcp._tool_manager.list_tools()) == 0

    async def test_remove_nonexistent_tool(self):
        """Test that removing a non-existent tool raises ToolError."""
        mcp = MCPServer()

        with pytest.raises(ToolError, match="Unknown tool: nonexistent"):
            mcp.remove_tool("nonexistent")

    async def test_remove_tool_and_list(self):
        """Test that a removed tool doesn't appear in list_tools."""
        mcp = MCPServer()
        mcp.add_tool(tool_fn)
        mcp.add_tool(error_tool_fn)

        # Verify both tools exist
        async with Client(mcp) as client:
            tools = await client.list_tools()
            assert len(tools.tools) == 2
            tool_names = [t.name for t in tools.tools]
            assert "tool_fn" in tool_names
            assert "error_tool_fn" in tool_names

        # Remove one tool
        mcp.remove_tool("tool_fn")

        # Verify only one tool remains
        async with Client(mcp) as client:
            tools = await client.list_tools()
            assert len(tools.tools) == 1
            assert tools.tools[0].name == "error_tool_fn"

    async def test_remove_tool_and_call(self):
        """Test that calling a removed tool fails appropriately."""
        mcp = MCPServer()
        mcp.add_tool(tool_fn)

        # Verify tool works before removal
        async with Client(mcp) as client:
            result = await client.call_tool("tool_fn", {"x": 1, "y": 2})
            assert not result.is_error
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert content.text == "3"

        # Remove the tool
        mcp.remove_tool("tool_fn")

        # Verify calling removed tool returns an error
        async with Client(mcp) as client:
            result = await client.call_tool("tool_fn", {"x": 1, "y": 2})
            assert result.is_error
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Unknown tool" in content.text


class TestServerResources:
    async def test_init_with_resources(self):
        def get_text() -> str:
            """Seeded resource."""
            return "Hello from init!"

        resource = FunctionResource.from_function(fn=get_text, uri="resource://init", name="init_resource")

        mcp = MCPServer(resources=[resource])

        async with Client(mcp) as client:
            assert client.initialize_result.capabilities.resources is not None

            resources = await client.list_resources()
            assert len(resources.resources) == 1
            listed = resources.resources[0]
            assert listed.uri == "resource://init"
            assert listed.name == "init_resource"
            assert listed.description == "Seeded resource."

            result = await client.read_resource("resource://init")

            assert len(result.contents) == 1
            content = result.contents[0]
            assert isinstance(content, TextResourceContents)
            assert content.text == "Hello from init!"

    async def test_text_resource(self):
        mcp = MCPServer()

        def get_text():
            return "Hello, world!"

        resource = FunctionResource(uri="resource://test", name="test", fn=get_text)
        mcp.add_resource(resource)

        async with Client(mcp) as client:
            result = await client.read_resource("resource://test")

            assert isinstance(result.contents[0], TextResourceContents)
            assert result.contents[0].text == "Hello, world!"

    async def test_read_unknown_resource(self):
        """Test that reading an unknown resource raises MCPError."""
        mcp = MCPServer()

        async with Client(mcp) as client:
            with pytest.raises(MCPError, match="Unknown resource: unknown://missing"):
                await client.read_resource("unknown://missing")

    async def test_read_resource_error(self):
        """Test that resource read errors are properly wrapped in MCPError."""
        mcp = MCPServer()

        @mcp.resource("resource://failing")
        def failing_resource():
            raise ValueError("Resource read failed")

        async with Client(mcp) as client:
            with pytest.raises(MCPError, match="Error reading resource resource://failing"):
                await client.read_resource("resource://failing")

    async def test_binary_resource(self):
        mcp = MCPServer()

        def get_binary():
            return b"Binary data"

        resource = FunctionResource(
            uri="resource://binary",
            name="binary",
            fn=get_binary,
            mime_type="application/octet-stream",
        )
        mcp.add_resource(resource)

        async with Client(mcp) as client:
            result = await client.read_resource("resource://binary")

            assert isinstance(result.contents[0], BlobResourceContents)
            assert result.contents[0].blob == base64.b64encode(b"Binary data").decode()

    async def test_file_resource_text(self, tmp_path: Path):
        mcp = MCPServer()

        # Create a text file
        text_file = tmp_path / "test.txt"
        text_file.write_text("Hello from file!")

        resource = FileResource(uri="file://test.txt", name="test.txt", path=text_file)
        mcp.add_resource(resource)

        async with Client(mcp) as client:
            result = await client.read_resource("file://test.txt")

            assert isinstance(result.contents[0], TextResourceContents)
            assert result.contents[0].text == "Hello from file!"

    async def test_file_resource_binary(self, tmp_path: Path):
        mcp = MCPServer()

        # Create a binary file
        binary_file = tmp_path / "test.bin"
        binary_file.write_bytes(b"Binary file data")

        resource = FileResource(
            uri="file://test.bin",
            name="test.bin",
            path=binary_file,
            mime_type="application/octet-stream",
        )
        mcp.add_resource(resource)

        async with Client(mcp) as client:
            result = await client.read_resource("file://test.bin")

            assert isinstance(result.contents[0], BlobResourceContents)
            assert result.contents[0].blob == base64.b64encode(b"Binary file data").decode()

    async def test_function_resource(self):
        mcp = MCPServer()

        @mcp.resource("function://test", name="test_get_data")
        def get_data() -> str:  # pragma: no cover
            """get_data returns a string"""
            return "Hello, world!"

        async with Client(mcp) as client:
            resources = await client.list_resources()
            assert len(resources.resources) == 1
            resource = resources.resources[0]
            assert resource.description == "get_data returns a string"
            assert resource.uri == "function://test"
            assert resource.name == "test_get_data"
            assert resource.mime_type == "text/plain"


class TestServerResourceTemplates:
    async def test_resource_with_params(self):
        """Test that a resource with function parameters raises an error if the URI
        parameters don't match"""
        mcp = MCPServer()

        with pytest.raises(ValueError, match="Mismatch between URI parameters"):

            @mcp.resource("resource://data")
            def get_data_fn(param: str) -> str:  # pragma: no cover
                return f"Data: {param}"

    async def test_resource_with_uri_params(self):
        """Test that a resource with URI parameters is automatically a template"""
        mcp = MCPServer()

        with pytest.raises(ValueError, match="Mismatch between URI parameters"):

            @mcp.resource("resource://{param}")
            def get_data() -> str:  # pragma: no cover
                return "Data"

    async def test_resource_with_untyped_params(self):
        """Test that a resource with untyped parameters raises an error"""
        mcp = MCPServer()

        @mcp.resource("resource://{param}")
        def get_data(param) -> str:  # type: ignore  # pragma: no cover
            return "Data"

    async def test_resource_matching_params(self):
        """Test that a resource with matching URI and function parameters works"""
        mcp = MCPServer()

        @mcp.resource("resource://{name}/data")
        def get_data(name: str) -> str:
            return f"Data for {name}"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://test/data")

            assert isinstance(result.contents[0], TextResourceContents)
            assert result.contents[0].text == "Data for test"

    async def test_resource_mismatched_params(self):
        """Test that mismatched parameters raise an error"""
        mcp = MCPServer()

        with pytest.raises(ValueError, match="Mismatch between URI parameters"):

            @mcp.resource("resource://{name}/data")
            def get_data(user: str) -> str:  # pragma: no cover
                return f"Data for {user}"

    async def test_resource_multiple_params(self):
        """Test that multiple parameters work correctly"""
        mcp = MCPServer()

        @mcp.resource("resource://{org}/{repo}/data")
        def get_data(org: str, repo: str) -> str:
            return f"Data for {org}/{repo}"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://cursor/myrepo/data")

            assert isinstance(result.contents[0], TextResourceContents)
            assert result.contents[0].text == "Data for cursor/myrepo"

    async def test_resource_multiple_mismatched_params(self):
        """Test that mismatched parameters raise an error"""
        mcp = MCPServer()

        with pytest.raises(ValueError, match="Mismatch between URI parameters"):

            @mcp.resource("resource://{org}/{repo}/data")
            def get_data_mismatched(org: str, repo_2: str) -> str:  # pragma: no cover
                return f"Data for {org}"

        """Test that a resource with no parameters works as a regular resource"""
        mcp = MCPServer()

        @mcp.resource("resource://static")
        def get_static_data() -> str:
            return "Static data"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://static")

            assert isinstance(result.contents[0], TextResourceContents)
            assert result.contents[0].text == "Static data"

    async def test_template_to_resource_conversion(self):
        """Test that templates are properly converted to resources when accessed"""
        mcp = MCPServer()

        @mcp.resource("resource://{name}/data")
        def get_data(name: str) -> str:
            return f"Data for {name}"

        # Should be registered as a template
        assert len(mcp._resource_manager._templates) == 1
        assert len(await mcp.list_resources()) == 0

        # When accessed, should create a concrete resource
        resource = await mcp._resource_manager.get_resource("resource://test/data", Context())
        assert isinstance(resource, FunctionResource)
        result = await resource.read()
        assert result == "Data for test"

    async def test_resource_template_includes_mime_type(self):
        """Test that list resource templates includes the correct mimeType."""
        mcp = MCPServer()

        @mcp.resource("resource://{user}/csv", mime_type="text/csv")
        def get_csv(user: str) -> str:
            return f"csv for {user}"

        templates = await mcp.list_resource_templates()
        assert templates == snapshot(
            [
                ResourceTemplate(
                    name="get_csv", uri_template="resource://{user}/csv", description="", mime_type="text/csv"
                )
            ]
        )

        async with Client(mcp) as client:
            result = await client.read_resource("resource://bob/csv")
            assert result == snapshot(
                ReadResourceResult(
                    contents=[TextResourceContents(uri="resource://bob/csv", mime_type="text/csv", text="csv for bob")]
                )
            )


class TestServerResourceMetadata:
    """Test MCPServer @resource decorator meta parameter for list operations.

    Meta flows: @resource decorator -> resource/template storage -> list_resources/list_resource_templates.
    Note: read_resource does NOT pass meta to protocol response (lowlevel/server.py only extracts content/mime_type).
    """

    async def test_resource_decorator_with_metadata(self):
        """Test that @resource decorator accepts and passes meta parameter."""
        # Tests static resource flow: decorator -> FunctionResource -> list_resources (server.py:544,635,361)
        mcp = MCPServer()

        @mcp.resource("resource://config", meta={"ui": {"component": "file-viewer"}, "priority": "high"})
        def get_config() -> str: ...  # pragma: no branch

        resources = await mcp.list_resources()
        assert resources == snapshot(
            [
                Resource(
                    name="get_config",
                    uri="resource://config",
                    description="",
                    mime_type="text/plain",
                    meta={"ui": {"component": "file-viewer"}, "priority": "high"},  # type: ignore[reportCallIssue]
                )
            ]
        )

    async def test_resource_template_decorator_with_metadata(self):
        """Test that @resource decorator passes meta to templates."""
        # Tests template resource flow: decorator -> add_template() -> list_resource_templates (server.py:544,622,377)
        mcp = MCPServer()

        @mcp.resource("resource://{city}/weather", meta={"api_version": "v2", "deprecated": False})
        def get_weather(city: str) -> str: ...  # pragma: no branch

        templates = await mcp.list_resource_templates()
        assert templates == snapshot(
            [
                ResourceTemplate(
                    name="get_weather",
                    uri_template="resource://{city}/weather",
                    description="",
                    mime_type="text/plain",
                    meta={"api_version": "v2", "deprecated": False},  # type: ignore[reportCallIssue]
                )
            ]
        )

    async def test_read_resource_returns_meta(self):
        """Test that read_resource includes meta in response."""
        # Tests end-to-end: Resource.meta -> ReadResourceContents.meta -> protocol _meta (lowlevel/server.py:341,371)
        mcp = MCPServer()

        @mcp.resource("resource://data", meta={"version": "1.0", "category": "config"})
        def get_data() -> str:
            return "test data"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://data")
            assert result == snapshot(
                ReadResourceResult(
                    contents=[
                        TextResourceContents(
                            uri="resource://data",
                            mime_type="text/plain",
                            meta={"version": "1.0", "category": "config"},  # type: ignore[reportUnknownMemberType]
                            text="test data",
                        )
                    ]
                )
            )


class TestContextInjection:
    """Test context injection in tools, resources, and prompts."""

    async def test_context_detection(self):
        """Test that context parameters are properly detected."""
        mcp = MCPServer()

        def tool_with_context(x: int, ctx: Context) -> str:  # pragma: no cover
            return f"Request {ctx.request_id}: {x}"

        tool = mcp._tool_manager.add_tool(tool_with_context)
        assert tool.context_kwarg == "ctx"

    async def test_context_injection(self):
        """Test that context is properly injected into tool calls."""
        mcp = MCPServer()

        def tool_with_context(x: int, ctx: Context) -> str:
            assert ctx.request_id is not None
            return f"Request {ctx.request_id}: {x}"

        mcp.add_tool(tool_with_context)
        async with Client(mcp) as client:
            result = await client.call_tool("tool_with_context", {"x": 42})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Request" in content.text
            assert "42" in content.text

    async def test_async_context(self):
        """Test that context works in async functions."""
        mcp = MCPServer()

        async def async_tool(x: int, ctx: Context) -> str:
            assert ctx.request_id is not None
            return f"Async request {ctx.request_id}: {x}"

        mcp.add_tool(async_tool)
        async with Client(mcp) as client:
            result = await client.call_tool("async_tool", {"x": 42})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Async request" in content.text
            assert "42" in content.text

    async def test_context_logging(self):
        """Test that context logging methods work."""
        mcp = MCPServer()

        async def logging_tool(msg: str, ctx: Context) -> str:
            await ctx.debug("Debug message")
            await ctx.info("Info message")
            await ctx.warning("Warning message")
            await ctx.error("Error message")
            return f"Logged messages for {msg}"

        mcp.add_tool(logging_tool)

        with patch("mcp.server.session.ServerSession.send_log_message") as mock_log:
            async with Client(mcp) as client:
                result = await client.call_tool("logging_tool", {"msg": "test"})
                assert len(result.content) == 1
                content = result.content[0]
                assert isinstance(content, TextContent)
                assert "Logged messages for test" in content.text

                assert mock_log.call_count == 4
                mock_log.assert_any_call(level="debug", data="Debug message", logger=None, related_request_id="2")
                mock_log.assert_any_call(level="info", data="Info message", logger=None, related_request_id="2")
                mock_log.assert_any_call(level="warning", data="Warning message", logger=None, related_request_id="2")
                mock_log.assert_any_call(level="error", data="Error message", logger=None, related_request_id="2")

    async def test_optional_context(self):
        """Test that context is optional."""
        mcp = MCPServer()

        def no_context(x: int) -> int:
            return x * 2

        mcp.add_tool(no_context)
        async with Client(mcp) as client:
            result = await client.call_tool("no_context", {"x": 21})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert content.text == "42"

    async def test_context_resource_access(self):
        """Test that context can access resources."""
        mcp = MCPServer()

        @mcp.resource("test://data")
        def test_resource() -> str:
            return "resource data"

        @mcp.tool()
        async def tool_with_resource(ctx: Context) -> str:
            r_iter = await ctx.read_resource("test://data")
            r_list = list(r_iter)
            assert len(r_list) == 1
            r = r_list[0]
            return f"Read resource: {r.content} with mime type {r.mime_type}"

        async with Client(mcp) as client:
            result = await client.call_tool("tool_with_resource", {})
            assert len(result.content) == 1
            content = result.content[0]
            assert isinstance(content, TextContent)
            assert "Read resource: resource data" in content.text

    async def test_resource_with_context(self):
        """Test that resources can receive context parameter."""
        mcp = MCPServer()

        @mcp.resource("resource://context/{name}")
        def resource_with_context(name: str, ctx: Context) -> str:
            """Resource that receives context."""
            assert ctx is not None
            return f"Resource {name} - context injected"

        # Verify template has context_kwarg set
        templates = mcp._resource_manager.list_templates()
        assert len(templates) == 1
        template = templates[0]
        assert hasattr(template, "context_kwarg")
        assert template.context_kwarg == "ctx"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://context/test")

            assert len(result.contents) == 1
            content = result.contents[0]
            assert isinstance(content, TextResourceContents)
            # Should have either request_id or indication that context was injected
            assert "Resource test - context injected" == content.text

    async def test_resource_without_context(self):
        """Test that resources without context work normally."""
        mcp = MCPServer()

        @mcp.resource("resource://nocontext/{name}")
        def resource_no_context(name: str) -> str:
            """Resource without context."""
            return f"Resource {name} works"

        # Verify template has no context_kwarg
        templates = mcp._resource_manager.list_templates()
        assert len(templates) == 1
        template = templates[0]
        assert template.context_kwarg is None

        async with Client(mcp) as client:
            result = await client.read_resource("resource://nocontext/test")
            assert result == snapshot(
                ReadResourceResult(
                    contents=[
                        TextResourceContents(
                            uri="resource://nocontext/test", mime_type="text/plain", text="Resource test works"
                        )
                    ]
                )
            )

    async def test_resource_context_custom_name(self):
        """Test resource context with custom parameter name."""
        mcp = MCPServer()

        @mcp.resource("resource://custom/{id}")
        def resource_custom_ctx(id: str, my_ctx: Context) -> str:
            """Resource with custom context parameter name."""
            assert my_ctx is not None
            return f"Resource {id} with context"

        # Verify template detects custom context parameter
        templates = mcp._resource_manager.list_templates()
        assert len(templates) == 1
        template = templates[0]
        assert template.context_kwarg == "my_ctx"

        async with Client(mcp) as client:
            result = await client.read_resource("resource://custom/123")
            assert result == snapshot(
                ReadResourceResult(
                    contents=[
                        TextResourceContents(
                            uri="resource://custom/123", mime_type="text/plain", text="Resource 123 with context"
                        )
                    ]
                )
            )

    async def test_prompt_with_context(self):
        """Test that prompts can receive context parameter."""
        mcp = MCPServer()

        @mcp.prompt("prompt_with_ctx")
        def prompt_with_context(text: str, ctx: Context) -> str:
            """Prompt that expects context."""
            assert ctx is not None
            return f"Prompt '{text}' - context injected"

        # Test via client
        async with Client(mcp) as client:
            # Try calling without passing ctx explicitly
            result = await client.get_prompt("prompt_with_ctx", {"text": "test"})
            # If this succeeds, check if context was injected
            assert len(result.messages) == 1
            content = result.messages[0].content
            assert isinstance(content, TextContent)
            assert "Prompt 'test' - context injected" in content.text

    async def test_prompt_without_context(self):
        """Test that prompts without context work normally."""
        mcp = MCPServer()

        @mcp.prompt("prompt_no_ctx")
        def prompt_no_context(text: str) -> str:
            """Prompt without context."""
            return f"Prompt '{text}' works"

        # Test via client
        async with Client(mcp) as client:
            result = await client.get_prompt("prompt_no_ctx", {"text": "test"})
            assert len(result.messages) == 1
            message = result.messages[0]
            content = message.content
            assert isinstance(content, TextContent)
            assert content.text == "Prompt 'test' works"


class TestServerPrompts:
    """Test prompt functionality in MCPServer server."""

    async def test_get_prompt_direct_call_without_context(self):
        """Test calling mcp.get_prompt() directly without passing context."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn() -> str:
            return "Hello, world!"

        result = await mcp.get_prompt("fn")
        content = result.messages[0].content
        assert isinstance(content, TextContent)
        assert content.text == "Hello, world!"

    async def test_prompt_decorator(self):
        """Test that the prompt decorator registers prompts correctly."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn() -> str:
            return "Hello, world!"

        prompts = mcp._prompt_manager.list_prompts()
        assert len(prompts) == 1
        assert prompts[0].name == "fn"
        # Don't compare functions directly since validate_call wraps them
        content = await prompts[0].render(None, Context())
        assert isinstance(content[0].content, TextContent)
        assert content[0].content.text == "Hello, world!"

    async def test_prompt_decorator_with_name(self):
        """Test prompt decorator with custom name."""
        mcp = MCPServer()

        @mcp.prompt(name="custom_name")
        def fn() -> str:
            return "Hello, world!"

        prompts = mcp._prompt_manager.list_prompts()
        assert len(prompts) == 1
        assert prompts[0].name == "custom_name"
        content = await prompts[0].render(None, Context())
        assert isinstance(content[0].content, TextContent)
        assert content[0].content.text == "Hello, world!"

    async def test_prompt_decorator_with_description(self):
        """Test prompt decorator with custom description."""
        mcp = MCPServer()

        @mcp.prompt(description="A custom description")
        def fn() -> str:
            return "Hello, world!"

        prompts = mcp._prompt_manager.list_prompts()
        assert len(prompts) == 1
        assert prompts[0].description == "A custom description"
        content = await prompts[0].render(None, Context())
        assert isinstance(content[0].content, TextContent)
        assert content[0].content.text == "Hello, world!"

    def test_prompt_decorator_error(self):
        """Test error when decorator is used incorrectly."""
        mcp = MCPServer()
        with pytest.raises(TypeError, match="decorator was used incorrectly"):

            @mcp.prompt  # type: ignore
            def fn() -> str: ...  # pragma: no branch

    async def test_list_prompts(self):
        """Test listing prompts through MCP protocol."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn(name: str, optional: str = "default") -> str: ...  # pragma: no branch

        async with Client(mcp) as client:
            result = await client.list_prompts()
            assert result == snapshot(
                ListPromptsResult(
                    prompts=[
                        Prompt(
                            name="fn",
                            description="",
                            arguments=[
                                PromptArgument(name="name", required=True),
                                PromptArgument(name="optional", required=False),
                            ],
                        )
                    ]
                )
            )

    async def test_get_prompt(self):
        """Test getting a prompt through MCP protocol."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn(name: str) -> str:
            return f"Hello, {name}!"

        async with Client(mcp) as client:
            result = await client.get_prompt("fn", {"name": "World"})
            assert result == snapshot(
                GetPromptResult(
                    description="",
                    messages=[PromptMessage(role="user", content=TextContent(text="Hello, World!"))],
                )
            )

    async def test_get_prompt_with_description(self):
        """Test getting a prompt through MCP protocol."""
        mcp = MCPServer()

        @mcp.prompt(description="Test prompt description")
        def fn(name: str) -> str:
            return f"Hello, {name}!"

        async with Client(mcp) as client:
            result = await client.get_prompt("fn", {"name": "World"})
            assert result.description == "Test prompt description"

    async def test_get_prompt_with_docstring_description(self):
        """Test prompt uses docstring as description when not explicitly provided."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn(name: str) -> str:
            """This is the function docstring."""
            return f"Hello, {name}!"

        async with Client(mcp) as client:
            result = await client.get_prompt("fn", {"name": "World"})
            assert result == snapshot(
                GetPromptResult(
                    description="This is the function docstring.",
                    messages=[PromptMessage(role="user", content=TextContent(text="Hello, World!"))],
                )
            )

    async def test_get_prompt_with_resource(self):
        """Test getting a prompt that returns resource content."""
        mcp = MCPServer()

        @mcp.prompt()
        def fn() -> Message:
            return UserMessage(
                content=EmbeddedResource(
                    type="resource",
                    resource=TextResourceContents(uri="file://file.txt", text="File contents", mime_type="text/plain"),
                )
            )

        async with Client(mcp) as client:
            result = await client.get_prompt("fn")
            assert result == snapshot(
                GetPromptResult(
                    description="",
                    messages=[
                        PromptMessage(
                            role="user",
                            content=EmbeddedResource(
                                resource=TextResourceContents(
                                    uri="file://file.txt", mime_type="text/plain", text="File contents"
                                )
                            ),
                        )
                    ],
                )
            )

    async def test_get_unknown_prompt(self):
        """Test error when getting unknown prompt."""
        mcp = MCPServer()

        async with Client(mcp) as client:
            with pytest.raises(MCPError, match="Unknown prompt"):
                await client.get_prompt("unknown")

    async def test_get_prompt_missing_args(self):
        """Test error when required arguments are missing."""
        mcp = MCPServer()

        @mcp.prompt()
        def prompt_fn(name: str) -> str: ...  # pragma: no branch

        async with Client(mcp) as client:
            with pytest.raises(MCPError, match="Missing required arguments"):
                await client.get_prompt("prompt_fn")


async def test_completion_decorator() -> None:
    """Test that the completion decorator registers a working handler."""
    mcp = MCPServer()

    @mcp.completion()
    async def handle_completion(
        ref: PromptReference, argument: CompletionArgument, context: CompletionContext | None
    ) -> Completion:
        assert argument.name == "style"
        return Completion(values=["bold", "italic", "underline"])

    async with Client(mcp) as client:
        ref = PromptReference(type="ref/prompt", name="test")
        result = await client.complete(ref=ref, argument={"name": "style", "value": "b"})
        assert result.completion.values == ["bold", "italic", "underline"]


def test_streamable_http_no_redirect() -> None:
    """Test that streamable HTTP routes are correctly configured."""
    mcp = MCPServer()
    # streamable_http_path defaults to "/mcp"
    app = mcp.streamable_http_app()

    # Find routes by type - streamable_http_app creates Route objects, not Mount objects
    streamable_routes = [r for r in app.routes if isinstance(r, Route) and hasattr(r, "path") and r.path == "/mcp"]

    # Verify routes exist
    assert len(streamable_routes) == 1, "Should have one streamable route"

    # Verify path values
    assert streamable_routes[0].path == "/mcp", "Streamable route path should be /mcp"


async def test_report_progress_passes_related_request_id():
    """Test that report_progress passes the request_id as related_request_id.

    Without related_request_id, the streamable HTTP transport cannot route
    progress notifications to the correct SSE stream, causing them to be
    silently dropped. See #953 and #2001.
    """
    mock_session = AsyncMock()
    mock_session.send_progress_notification = AsyncMock()

    request_context = ServerRequestContext(
        request_id="req-abc-123",
        session=mock_session,
        meta={"progress_token": "tok-1"},
        lifespan_context=None,
        protocol_version="2025-11-25",
    )

    ctx = Context(request_context=request_context, mcp_server=MagicMock())

    await ctx.report_progress(50, 100, message="halfway")

    mock_session.send_progress_notification.assert_awaited_once_with(
        progress_token="tok-1",
        progress=50,
        total=100,
        message="halfway",
        related_request_id="req-abc-123",
    )