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core/auto-char-card/context-manager.js

@@ -0,0 +1,63 @@
+export class ContextManager {
+    constructor() {
+        this.keepToolOutputTurns = 3; 
+        this.tokenLimit = 12000; 
+    }
+
+    estimateTokens(text) {
+        return Math.ceil((text || '').length / 3.5);
+    }
+
+    buildMessages(systemPrompt, history, maxTokens) {
+        const limit = maxTokens || this.tokenLimit;
+        const systemTokens = this.estimateTokens(systemPrompt);
+        let availableTokens = limit - systemTokens - 1000; 
+
+        if (availableTokens < 0) availableTokens = 1000; 
+
+        const optimizedHistory = this.optimizeToolOutputs(history);
+
+        const finalMessages = [];
+        let currentTokens = 0;
+
+        for (let i = optimizedHistory.length - 1; i >= 0; i--) {
+            const msg = optimizedHistory[i];
+            const msgTokens = this.estimateTokens(msg.content);
+
+            if (currentTokens + msgTokens > availableTokens) {
+                finalMessages.unshift({ role: 'system', content: "[Earlier history truncated to save tokens]" });
+                break;
+            }
+
+            finalMessages.unshift(msg);
+            currentTokens += msgTokens;
+        }
+
+        return [
+            { role: 'system', content: systemPrompt },
+            ...finalMessages
+        ];
+    }
+
+    optimizeToolOutputs(history) {
+        let toolOutputCount = 0;
+        const reversedHistory = [...history].reverse();
+        
+        const processedReversed = reversedHistory.map((msg) => {
+            if (msg.role === 'user' && msg.content.startsWith('[Tool Result')) {
+                toolOutputCount++;
+                
+                if (toolOutputCount > this.keepToolOutputTurns) {
+                    const firstLine = msg.content.split('\n')[0];
+                    return {
+                        role: msg.role,
+                        content: `${firstLine}\n[Content hidden to save tokens. The tool was executed successfully.]`
+                    };
+                }
+            }
+            return msg;
+        });
+
+        return processedReversed.reverse();
+    }
+}