modelcontextprotocol / modelcontextprotocol/python-sdk
Specifying capabilities w/ FastMCP Server
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- #1043 by @gspencergoog — closed without merging
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Description
Question
I noticed that the FastMCP server does not have the options to manually specify the capabilities of the server, however it is possible to do so with the low-level server.
My current workaround to advertise the capabilities is like so:
mcp = FastMCP("test-server")
# Manually set notification options
lowlevel_server: Server = mcp._mcp_server
lowlevel_server.notification_options.resources_changed = True
lowlevel_server.notification_options.tools_changed = True
# Now, we override the mcp.run()
async def main():
async with stdio_server() as (r, w):
init_opts = lowlevel_server.create_initialization_options(
lowlevel_server.notification_options,
{}
)
await lowlevel_server.run(r, w, init_opts)
if __name__ == "__main__":
anyio.run(main)
Is there any other way to specify the capabilities of the FastMCP server? Is there a reason not to?
Thanks!
Additional Context
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the FastMCP entry point and the low-level Server methods shown in the report: notification_options, create_initialization_options, and run. Determine how FastMCP initialization currently exposes capabilities and define done as allowing those capabilities to be specified without overriding mcp.run().
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- api
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100