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09d1b8e 09438a8 09d1b8e 09438a8 09d1b8e 09438a8 09d1b8e c4ac623 09d1b8e c4ac623 09d1b8e c4ac623 09d1b8e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | from typing import cast
import pytest
from mcp.types import TextContent
from fastmcp import Client, Context, FastMCP
from fastmcp.client.sampling import RequestContext, SamplingMessage, SamplingParams
@pytest.fixture
def fastmcp_server():
mcp = FastMCP()
@mcp.tool
async def simple_sample(message: str, context: Context) -> str:
result = await context.sample("Hello, world!")
return cast(TextContent, result).text
@mcp.tool
async def sample_with_system_prompt(message: str, context: Context) -> str:
result = await context.sample("Hello, world!", system_prompt="You love FastMCP")
return cast(TextContent, result).text
@mcp.tool
async def sample_with_messages(message: str, context: Context) -> str:
result = await context.sample(
[
"Hello!",
SamplingMessage(
content=TextContent(
type="text", text="How can I assist you today?"
),
role="assistant",
),
]
)
return cast(TextContent, result).text
return mcp
async def test_simple_sampling(fastmcp_server: FastMCP):
def sampling_handler(
messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext
) -> str:
return "This is the sample message!"
async with Client(fastmcp_server, sampling_handler=sampling_handler) as client:
result = await client.call_tool("simple_sample", {"message": "Hello, world!"})
reply = cast(TextContent, result[0])
assert reply.text == "This is the sample message!"
async def test_sampling_with_system_prompt(fastmcp_server: FastMCP):
def sampling_handler(
messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext
) -> str:
assert params.systemPrompt is not None
return params.systemPrompt
async with Client(fastmcp_server, sampling_handler=sampling_handler) as client:
result = await client.call_tool(
"sample_with_system_prompt", {"message": "Hello, world!"}
)
reply = cast(TextContent, result[0])
assert reply.text == "You love FastMCP"
async def test_sampling_with_messages(fastmcp_server: FastMCP):
def sampling_handler(
messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext
) -> str:
assert len(messages) == 2
assert messages[0].content.type == "text"
assert messages[0].content.text == "Hello!"
assert messages[1].content.type == "text"
assert messages[1].content.text == "How can I assist you today?"
return "I need to think."
async with Client(fastmcp_server, sampling_handler=sampling_handler) as client:
result = await client.call_tool(
"sample_with_messages", {"message": "Hello, world!"}
)
reply = cast(TextContent, result[0])
assert reply.text == "I need to think."
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