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mcp: avoid "null" when tools fail to return content

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For some reason, this was a regression from v0.3.1, for some of our
examples. Fix it and address the existing TODO.
This commit is contained in:
Rob Findley 2025-09-05 20:48:32 +00:00 • committed by Robert Findley
commit 4656930de8
1 changed files with 13 additions and 9 deletions
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12
mcp/streamable_test.go
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@ -520,7 +520,7 @@ func TestStreamableServerTransport(t *testing.T) {
method: "POST",
messages: []jsonrpc.Message{req(2, "tools/call", &CallToolParams{Name: "tool"})},
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{resp(2, &CallToolResult{}, nil)},
wantMessages: []jsonrpc.Message{resp(2, &CallToolResult{Content: []Content{}}, nil)},
},
},
},
@ -547,14 +547,14 @@ func TestStreamableServerTransport(t *testing.T) {
headers: http.Header{"Accept": {"text/plain", "*/*"}},
messages: []jsonrpc.Message{req(4, "tools/call", &CallToolParams{Name: "tool"})},
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{resp(4, &CallToolResult{}, nil)},
wantMessages: []jsonrpc.Message{resp(4, &CallToolResult{Content: []Content{}}, nil)},
},
{
method: "POST",
headers: http.Header{"Accept": {"text/*, application/*"}},
messages: []jsonrpc.Message{req(4, "tools/call", &CallToolParams{Name: "tool"})},
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{resp(4, &CallToolResult{}, nil)},
wantMessages: []jsonrpc.Message{resp(4, &CallToolResult{Content: []Content{}}, nil)},
},
},
},
@ -592,7 +592,7 @@ func TestStreamableServerTransport(t *testing.T) {
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{
req(0, "notifications/progress", &ProgressNotificationParams{}),
resp(2, &CallToolResult{}, nil),
resp(2, &CallToolResult{Content: []Content{}}, nil),
},
},
},
@ -624,7 +624,7 @@ func TestStreamableServerTransport(t *testing.T) {
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{
req(1, "roots/list", &ListRootsParams{}),
resp(2, &CallToolResult{}, nil),
resp(2, &CallToolResult{Content: []Content{}}, nil),
},
},
},
@ -674,7 +674,7 @@ func TestStreamableServerTransport(t *testing.T) {
},
wantStatusCode: http.StatusOK,
wantMessages: []jsonrpc.Message{
resp(2, &CallToolResult{}, nil),
resp(2, &CallToolResult{Content: []Content{}}, nil),
},
},
{