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fix(agent): avoid consecutive system messages in compression

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Append emergency compression note to the original system prompt
instead of creating a separate system message. Some APIs like
Zhipu reject two consecutive system messages.
This commit is contained in:
yinwm 2026-02-19 22:47:03 +08:00
parent 58b5e21d90
commit 1e96733435
1 changed files with 9 additions and 19 deletions
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28
pkg/agent/loop.go
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@ -779,31 +779,21 @@ func (al *AgentLoop) forceCompression(sessionKey string) {
mid := len(conversation) / 2 mid := len(conversation) / 2
// New history structure: // New history structure:
// 1. System Prompt // 1. System Prompt (with compression note appended)
// 2. [Summary of dropped part] - synthesized // 2. Second half of conversation
// 3. Second half of conversation // 3. Last message
// 4. Last message
// Simplified approach for emergency: Drop first half of conversation
// and rely on existing summary if present, or create a placeholder.
droppedCount := mid droppedCount := mid
keptConversation := conversation[mid:] keptConversation := conversation[mid:]
newHistory := make([]providers.Message, 0) newHistory := make([]providers.Message, 0)
newHistory = append(newHistory, history[0]) // System prompt
// Add a note about compression // Append compression note to the original system prompt instead of adding a new system message
compressionNote := fmt.Sprintf("[System: Emergency compression dropped %d oldest messages due to context limit]", droppedCount) // This avoids having two consecutive system messages which some APIs (like Zhipu) reject
// If there was an existing summary, we might lose it if it was in the dropped part (which is just messages). compressionNote := fmt.Sprintf("\n\n[System Note: Emergency compression dropped %d oldest messages due to context limit]", droppedCount)
// The summary is stored separately in session.Summary, so it persists! enhancedSystemPrompt := history[0]
// We just need to ensure the user knows there's a gap. enhancedSystemPrompt.Content = enhancedSystemPrompt.Content + compressionNote
newHistory = append(newHistory, enhancedSystemPrompt)
// We only modify the messages list here
newHistory = append(newHistory, providers.Message{
Role: "system",
Content: compressionNote,
})
newHistory = append(newHistory, keptConversation...) newHistory = append(newHistory, keptConversation...)
newHistory = append(newHistory, history[len(history)-1]) // Last message newHistory = append(newHistory, history[len(history)-1]) // Last message