Configuration to prevent parallel MCP server usage

[abhijeethp]

Is there a configuration available to prevent parallel usage of MCP server tools? Right now claude code used via the agent SDK in python can trigger multiple tool calls with the same tool concurrently.

[ashwin-ant]

This should only happen if a tool call is marked as read-only via annotation: https://modelcontextprotocol.io/legacy/concepts/tools#tool-annotations. Are you seeing otherwise?

[abhijeethp]

Yes, i have not defined read only annotations. my tool definition is simple with no annotations defined at all.

@mcp.tool()
def write(name: str, email: str):
....

And inspecting the code by default the read only tool annotation should be false:

[abhijeethp]

Hey @ashwin-ant & team, just bumping this ^

[Finndersen]

I've seen multiple MCP tool calls for the same tool "triggered" concurrently, but it seems like they're not actually executing concurrently? Is this expected?