Context Window Warning (#152)

* context window warning & compact command

* auto compact

* fix permissions

* update readme

* fix 3.5 context window

* small update

* remove unused interface

* remove unused msg

internal/llm/prompt/prompt.go

@@ -21,6 +21,8 @@ func GetAgentPrompt(agentName config.AgentName, provider models.ModelProvider) s
 		basePrompt = TitlePrompt(provider)
 	case config.AgentTask:
 		basePrompt = TaskPrompt(provider)
+	case config.AgentSummarizer:
+		basePrompt = SummarizerPrompt(provider)
 	default:
 		basePrompt = "You are a helpful assistant"
 	}

internal/llm/prompt/summarizer.go

@@ -0,0 +1,16 @@
+package prompt
+
+import "github.com/opencode-ai/opencode/internal/llm/models"
+
+func SummarizerPrompt(_ models.ModelProvider) string {
+	return `You are a helpful AI assistant tasked with summarizing conversations.
+
+When asked to summarize, provide a detailed but concise summary of the conversation. 
+Focus on information that would be helpful for continuing the conversation, including:
+- What was done
+- What is currently being worked on
+- Which files are being modified
+- What needs to be done next
+
+Your summary should be comprehensive enough to provide context but concise enough to be quickly understood.`
+}