Description
When running agent framework with MCP servers that doesn't implement prompts will cause an exception.
I have a .NET 10 MCP Server that is only exposing tools for the agent to use.
Here is the initialize call to my MCP server:
{
"result": {
"protocolVersion": "2025-11-25",
"capabilities": {
"logging": {},
"tools": {
"listChanged": true
}
},
"serverInfo": {
"name": "McpServer1",
"version": "1.0.0.0"
}
},
"id": 1,
"jsonrpc": "2.0"
}Under MCP, prompts are optional and are negotiated during initialization. A server that supports prompts must declare the prompts capability. A client should only call prompts/list when that capability was negotiated.
Yet I get an exception that mcp.shared.exceptions.McpError: Method 'prompts/list' is not available..
Before upgrading the agent-framework library from 1.0.0b251105 to 1.0.0rc5 it was not causing any exceptions as the one above, and I couldn't see any breaking changes regarding this issue either.
It also works if I add prompts to the MCP server, but this is not feasible either.
Why is it trying to list all prompts when the server capabilities never mention that it should have any prompts?
Code Sample
Error Messages / Stack Traces
Traceback (most recent call last):
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 1136, in __aenter__
await self.connect()
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 621, in connect
await self._run_on_lifecycle_owner("connect", reset=reset)
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 596, in _run_on_lifecycle_owner
await future
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 540, in _run_lifecycle_owner
await self._connect_on_owner(reset=reset)
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 693, in _connect_on_owner
await self.load_prompts()
File "/.venv/lib/python3.13/site-packages/agent_framework/_mcp.py", line 846, in load_prompts
prompt_list = await self.session.list_prompts(params=params) # type: ignore[union-attr]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/.venv/lib/python3.13/site-packages/mcp/client/session.py", line 457, in list_prompts
return await self.send_request(
^^^^^^^^^^^^^^^^^^^^^^^^
...<2 lines>...
)
^
File "/.venv/lib/python3.13/site-packages/mcp/shared/session.py", line 306, in send_request
raise McpError(response_or_error.error)
mcp.shared.exceptions.McpError: Method 'prompts/list' is not available.Package Versions
agent-framework: 1.0.0rc5
Python Version
Python 3.13
Additional Context
No response
Description
When running agent framework with MCP servers that doesn't implement prompts will cause an exception.
I have a .NET 10 MCP Server that is only exposing tools for the agent to use.
Here is the initialize call to my MCP server:
{ "result": { "protocolVersion": "2025-11-25", "capabilities": { "logging": {}, "tools": { "listChanged": true } }, "serverInfo": { "name": "McpServer1", "version": "1.0.0.0" } }, "id": 1, "jsonrpc": "2.0" }Under MCP, prompts are optional and are negotiated during initialization. A server that supports prompts must declare the prompts capability. A client should only call
prompts/listwhen that capability was negotiated.Yet I get an exception that
mcp.shared.exceptions.McpError: Method 'prompts/list' is not available..Before upgrading the
agent-frameworklibrary from1.0.0b251105to1.0.0rc5it was not causing any exceptions as the one above, and I couldn't see any breaking changes regarding this issue either.It also works if I add prompts to the MCP server, but this is not feasible either.
Why is it trying to list all prompts when the server capabilities never mention that it should have any prompts?
Code Sample
Error Messages / Stack Traces
Package Versions
agent-framework: 1.0.0rc5
Python Version
Python 3.13
Additional Context
No response