Update context-pruner: with no instructionsPrompt added, we don't need to remove it each time

Author: jahooma

.agents/__tests__/context-pruner.test.ts

@@ -65,12 +65,7 @@ describe('context-pruner handleSteps', () => {
   })
 
   const runHandleSteps = (messages: Message[]) => {
-    // Add instructions prompt that will be removed by context-pruner
-    const messagesWithInstructions = [
-      ...messages,
-      createMessage('user', 'Instructions prompt'),
-    ]
-    mockAgentState.messageHistory = messagesWithInstructions
+    mockAgentState.messageHistory = messages
     const mockLogger = {
       debug: () => {},
       info: () => {},
@@ -337,12 +332,7 @@ describe('context-pruner edge cases', () => {
   })
 
   const runHandleSteps = (messages: Message[]) => {
-    // Add instructions prompt that will be removed by context-pruner
-    const messagesWithInstructions = [
-      ...messages,
-      createMessage('user', 'Instructions prompt'),
-    ]
-    mockAgentState.messageHistory = messagesWithInstructions
+    mockAgentState.messageHistory = messages
     const mockLogger = {
       debug: () => {},
       info: () => {},

.agents/context-pruner.ts

@@ -40,8 +40,6 @@ const definition: AgentDefinition = {
     const numTerminalCommandsToKeep = 5
 
     let currentMessages = [...messages]
-    // Remove injected instructions prompt
-    currentMessages.pop()
 
     // Initial check - if already under limit, return
     const initialTokens = countTokensJson(currentMessages)