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fix(mcp): use NDJSON instead of LSP framing for MCP stdio

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Replace Content-Length framing with newline-delimited JSON (NDJSON) for MCP stdio transport. MCP clients like Claude Code expect one JSON object per line, not LSP-style Content-Length headers. The previous framing caused clients to reject responses.
This commit is contained in:
David H. Friedel Jr.
2026-04-15 02:20:20 -04:00
parent 4b350fe967
commit 3740024cc4
1 changed files with 4 additions and 1 deletions
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5
main.go
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@@ -215,7 +215,10 @@ func writeResponse(resp interface{}) {
} }
func writeFramed(data []byte) { func writeFramed(data []byte) {
fmt.Fprintf(os.Stdout, "Content-Length: %d\r\n\r\n%s", len(data), data) // MCP stdio transport uses newline-delimited JSON (NDJSON), not LSP-style
// Content-Length framing. Claude Code and other MCP clients reject
// Content-Length headers on stdio, so we emit one JSON object per line.
fmt.Fprintf(os.Stdout, "%s\n", data)
} }
func debugLog(format string, args ...interface{}) { func debugLog(format string, args ...interface{}) {