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mcp: set content to marshaled output (#398)

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The ToolHandler constructed by ToolFor sets the result's Content to the
marshaled output, following the spec's suggestion.

See
https://modelcontextprotocol.io/specification/2025-06-18/server/tools#structured-content.

Also, set StructuredContent to the marshaled RawMessage to avoid a
double marshal.

Fixes #391.
This commit is contained in:
Jonathan Amsterdam 2025-09-03 10:37:27 -04:00 • committed by GitHub
commit 7769b2a959
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1 changed files with 28 additions and 12 deletions
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10
mcp/streamable_test.go
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@ -1175,7 +1175,10 @@ func TestStreamableStateless(t *testing.T) {
req(2, "tools/call", &CallToolParams{Name: "greet", Arguments: hiParams{Name: "World"}}),
},
wantMessages: []jsonrpc.Message{
resp(2, &CallToolResult{Content: []Content{&TextContent{Text: "hi World"}}}, nil),
resp(2, &CallToolResult{
Content: []Content{&TextContent{Text: "hi World"}},
StructuredContent: json.RawMessage("null"),
}, nil),
},
wantSessionID: false,
},
@ -1186,7 +1189,10 @@ func TestStreamableStateless(t *testing.T) {
req(2, "tools/call", &CallToolParams{Name: "greet", Arguments: hiParams{Name: "foo"}}),
},
wantMessages: []jsonrpc.Message{
resp(2, &CallToolResult{Content: []Content{&TextContent{Text: "hi foo"}}}, nil),
resp(2, &CallToolResult{
Content: []Content{&TextContent{Text: "hi foo"}},
StructuredContent: json.RawMessage("null"),
}, nil),
},
wantSessionID: false,
},