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fix: replace assistant placeholder text to prevent model parroting

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Kiro API requires non-empty content on assistant messages, so
CLIProxyAPI injects placeholder text when assistant messages only
contain tool_use blocks (no text). The previous placeholders were
conversational phrases:

- DefaultAssistantContentWithTools: "I'll help you with that."
- DefaultAssistantContent: "I understand."

In agentic sessions with many tool calls, these phrases appeared
dozens of times in conversation history. Opus 4.6 (and likely other
models) picked up on this pattern and started parroting "I'll help
you with that." before every tool call in its actual responses.

Fix: Replace both placeholders with a single dot ".", which
satisfies Kiro's non-empty requirement without giving the model
a phrase to mimic.
This commit is contained in:
Joao
2026-02-06 16:42:21 +00:00
parent a35d66443b
commit 98edcad39d
1 changed files with 6 additions and 2 deletions
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8
internal/translator/kiro/common/constants.go
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@@ -31,11 +31,15 @@ const (
// DefaultAssistantContentWithTools is the fallback content for assistant messages
// that have tool_use but no text content. Kiro API requires non-empty content.
DefaultAssistantContentWithTools = "I'll help you with that."
// IMPORTANT: Use a minimal neutral string that the model won't mimic in responses.
// Previously "I'll help you with that." which caused the model to parrot it back.
DefaultAssistantContentWithTools = "."
// DefaultAssistantContent is the fallback content for assistant messages
// that have no content at all. Kiro API requires non-empty content.
DefaultAssistantContent = "I understand."
// IMPORTANT: Use a minimal neutral string that the model won't mimic in responses.
// Previously "I understand." which could leak into model behavior.
DefaultAssistantContent = "."
// KiroAgenticSystemPrompt is injected only for -agentic models to prevent timeouts on large writes.
// AWS Kiro API has a 2-3 minute timeout for large file write operations.