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internal/mcp: implement cancellation

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Use the existing jsonrpc2 preemption mechanism to implement MCP
cancellation.

This was mostly straightforward, except where I got confused about ID
unmarshaling. Leave a note about using omitempty when it is available.

Change-Id: I13e073f08c5d5c2cc78d882da4e6ff47f09fb340
Reviewed-on: https://go-review.googlesource.com/c/tools/+/667578
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
This commit is contained in:
Rob Findley 2025-04-23 19:29:46 +00:00 • committed by Robert Findley
commit 14b18b2645
1 changed files with 132 additions and 24 deletions
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11
internal/protocol/protocol.go
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@ -54,6 +54,17 @@ type CallToolResult struct {
IsError bool `json:"isError,omitempty"`
}
type CancelledParams struct {
// An optional string describing the reason for the cancellation. This MAY be
// logged or presented to the user.
Reason string `json:"reason,omitempty"`
// The ID of the request to cancel.
//
// This MUST correspond to the ID of a request previously issued in the same
// direction.
RequestId any `json:"requestId"`
}
// Capabilities a client may support. Known capabilities are defined here, in
// this schema, but this is not a closed set: any client can define its own,
// additional capabilities.