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fix: handle response.function_call_arguments.done in codex→claude streaming translator

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Some Codex models (e.g. gpt-5.3-codex-spark) send function call arguments
in a single "done" event without preceding "delta" events. The streaming
translator only handled "delta" events, causing tool call arguments to be
lost — resulting in empty tool inputs and infinite retry loops in clients
like Claude Code.

Emit the full arguments from the "done" event as a single input_json_delta
so downstream clients receive the complete tool input.
This commit is contained in:
Kirill Turanskiy
2026-02-16 00:20:23 +03:00
parent 4445a165e9
commit 07cf616e2b
1 changed files with 13 additions and 0 deletions
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13
internal/translator/codex/claude/codex_claude_response.go
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@@ -177,6 +177,19 @@ func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRa
output += "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
} else if typeStr == "response.function_call_arguments.done" {
// Some models (e.g. gpt-5.3-codex-spark) send function call arguments
// in a single "done" event without preceding "delta" events.
// Emit the full arguments as a single input_json_delta so the
// downstream Claude client receives the complete tool input.
if args := rootResult.Get("arguments").String(); args != "" {
template = `{"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":""}}`
template, _ = sjson.Set(template, "index", (*param).(*ConvertCodexResponseToClaudeParams).BlockIndex)
template, _ = sjson.Set(template, "delta.partial_json", args)
output += "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
}
}
return []string{output}