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mcp: use correct ResourceNotFound code (#35)

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Jonathan Amsterdam 2025-06-25 14:57:07 -04:00 • committed by GitHub
commit 09181c2c2e
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2 changed files with 2 additions and 8 deletions
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2
internal/jsonrpc2/wire.go
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@ -34,7 +34,7 @@ var (
// ErrUnknown should be used for all non coded errors.
ErrUnknown = NewError(-32001, "JSON RPC unknown error")
// ErrServerClosing is returned for calls that arrive while the server is closing.
ErrServerClosing = NewError(-32002, "JSON RPC server is closing")
ErrServerClosing = NewError(-32004, "JSON RPC server is closing")
// ErrClientClosing is a dummy error returned for calls initiated while the client is closing.
ErrClientClosing = NewError(-32003, "JSON RPC client is closing")
)

8
mcp/shared.go
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@ -207,13 +207,7 @@ func sessionMethod[S Session, P Params, R Result](f func(S, context.Context, P)
// Error codes
const (
// The error code to return when a resource isn't found.
// See https://modelcontextprotocol.io/specification/2025-03-26/server/resources#error-handling
// However, the code they chose is in the wrong space
// (see https://github.com/modelcontextprotocol/modelcontextprotocol/issues/509).
// so we pick a different one, arbitrarily for now (until they fix it).
// The immediate problem is that jsonprc2 defines -32002 as "server closing".
CodeResourceNotFound = -31002
CodeResourceNotFound = -32002
// The error code if the method exists and was called properly, but the peer does not support it.
CodeUnsupportedMethod = -31001
)