feat(minecraft): timestamp in blackboard

Author: shinohara-rin

services/minecraft/src/cognitive/conscious/blackboard.ts

@@ -9,13 +9,18 @@ export interface ChatMessage {
   timestamp: number
 }
 
+export interface ActionHistoryLine {
+  line: string
+  timestamp: number
+}
+
 export interface BlackboardState {
   ultimateGoal: string
   currentTask: string
   strategy: string
   contextView: contextViewState
   chatHistory: ChatMessage[]
-  recentActionHistory: string[]
+  recentActionHistory: ActionHistoryLine[]
   pendingActions: string[]
   selfUsername: string
 }
@@ -49,7 +54,7 @@ export class Blackboard {
   public get selfSummary(): string { return this._state.contextView.selfSummary }
   public get environmentSummary(): string { return this._state.contextView.environmentSummary }
   public get chatHistory(): ChatMessage[] { return this._state.chatHistory }
-  public get recentActionHistory(): string[] { return this._state.recentActionHistory }
+  public get recentActionHistory(): ActionHistoryLine[] { return this._state.recentActionHistory }
   public get pendingActions(): string[] { return this._state.pendingActions }
   public get selfUsername(): string { return this._state.selfUsername }
 
@@ -70,8 +75,8 @@ export class Blackboard {
     this._state = { ...this._state, chatHistory: newHistory }
   }
 
-  public addActionHistoryLine(line: string): void {
-    const next = [...this._state.recentActionHistory, line]
+  public addActionHistoryLine(line: string, timestamp: number = Date.now()): void {
+    const next = [...this._state.recentActionHistory, { line, timestamp }]
     const trimmed = next.length > Blackboard.MAX_ACTION_HISTORY ? next.slice(-Blackboard.MAX_ACTION_HISTORY) : next
     this._state = { ...this._state, recentActionHistory: trimmed }
   }
@@ -86,7 +91,7 @@ export class Blackboard {
       ...this._state,
       contextView: { ...this._state.contextView },
       chatHistory: [...this._state.chatHistory],
-      recentActionHistory: [...this._state.recentActionHistory],
+      recentActionHistory: this._state.recentActionHistory.map(l => ({ ...l })),
       pendingActions: [...this._state.pendingActions],
     }
   }

services/minecraft/src/cognitive/conscious/prompts/brain-prompt.ts

@@ -5,6 +5,18 @@ export function generateBrainSystemPrompt(
   blackboard: Blackboard,
   availableActions: Action[],
 ): string {
+  const now = Date.now()
+
+  const formatAgo = (timestamp: number): string => {
+    const diffMs = Math.max(0, now - timestamp)
+    const s = Math.floor(diffMs / 1000)
+    return `${s}s ago`
+  }
+
+  const withinLast = (timestamp: number, windowMs: number): boolean => {
+    return now - timestamp <= windowMs
+  }
+
   const actionDefinitions = availableActions.map((a) => {
     return {
       name: a.name,
@@ -15,6 +27,18 @@ export function generateBrainSystemPrompt(
 
   const availableActionsJson = JSON.stringify(actionDefinitions, null, 2)
 
+  const recentWindowMs = 30_000
+
+  const recentActionLines = blackboard.recentActionHistory
+    .filter(a => withinLast(a.timestamp, recentWindowMs))
+    .map(a => `- [${formatAgo(a.timestamp)}] ${a.line}`)
+    .join('\n')
+
+  const recentChatLines = blackboard.chatHistory
+    .filter(m => withinLast(m.timestamp, recentWindowMs))
+    .map(m => `- [${formatAgo(m.timestamp)}] ${m.sender}: ${m.content}`)
+    .join('\n')
+
   // TODO extract prompt components later
   // e.g. personality should be included from somewhere else
   return `
@@ -74,9 +98,9 @@ Pending actions (started and still running):
 ${blackboard.pendingActions.map(a => `- ${a}`).join('\n') || '- none'}
 
 Recent action results (most recent last):
-${blackboard.recentActionHistory.map(a => `- ${a}`).join('\n') || '- none'}
+${recentActionLines || '- none'}
 
 # Chat History (Recents):
-${blackboard.chatHistory.map(msg => `- ${msg.sender}: ${msg.content}`).join('\n') || 'No recent messages.'}
+${recentChatLines || 'No recent messages.'}
 `
 }