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fix(kiro): prepend placeholder user message when conversation starts with assistant role

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Kiro/AmazonQ API requires the conversation history to start with a user message.
Some clients (e.g., OpenClaw) send conversations starting with an assistant message,
which is valid for the native Claude API but causes 'Improperly formed request' (400)
on the Kiro endpoint.

This fix detects when the first message has role=assistant and prepends a minimal
placeholder user message ('.') to satisfy the Kiro API's message ordering requirement.

Upstream error: {"message":"Improperly formed request.","reason":null}
Verified: original request returns 400, fixed request returns 200.
This commit is contained in:
y
2026-02-12 11:09:47 +08:00
parent 2334a2b174
commit 086d8d0d0b
1 changed files with 11 additions and 0 deletions
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11
internal/translator/kiro/claude/kiro_claude_request.go
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@@ -586,6 +586,17 @@ func processMessages(messages gjson.Result, modelID, origin string) ([]KiroHisto
// Merge adjacent messages with the same role
messagesArray := kirocommon.MergeAdjacentMessages(messages.Array())
// FIX: Kiro API requires history to start with a user message.
// Some clients (e.g., OpenClaw) send conversations starting with an assistant message,
// which is valid for the Claude API but causes "Improperly formed request" on Kiro.
// Prepend a placeholder user message so the history alternation is correct.
if len(messagesArray) > 0 && messagesArray[0].Get("role").String() == "assistant" {
placeholder := `{"role":"user","content":"."}`
messagesArray = append([]gjson.Result{gjson.Parse(placeholder)}, messagesArray...)
log.Infof("kiro: messages started with assistant role, prepended placeholder user message for Kiro API compatibility")
}
for i, msg := range messagesArray {
role := msg.Get("role").String()
isLastMessage := i == len(messagesArray)-1