From 1e0298bde81693d8759112aa7a1429fe9445507d Mon Sep 17 00:00:00 2001
From: Daniel Smolsky <dannysmo@gmail.com>
Date: Tue, 13 Jan 2026 14:40:24 -0500
Subject: [PATCH] fix: skip synthetic message injection for GitHub Copilot when
 last message is user role

---
 lib/messages/inject.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/messages/inject.ts b/lib/messages/inject.ts
index 5048e18..81da973 100644
--- a/lib/messages/inject.ts
+++ b/lib/messages/inject.ts
@@ -143,6 +143,13 @@ export const insertPruneToolContext = (
     const isGitHubCopilot =
         providerID === "github-copilot" || providerID === "github-copilot-enterprise"
 
+    if (isGitHubCopilot) {
+        const lastMessage = messages[messages.length - 1]
+        if (lastMessage?.info?.role === "user") {
+            return
+        }
+    }
+
     logger.info("Injecting prunable-tools list", {
         providerID,
         isGitHubCopilot,