diff --git a/extensions/line/src/bot-message-context.test.ts b/extensions/line/src/bot-message-context.test.ts
index c3fb0efcae5..f6ac0c25740 100644
--- a/extensions/line/src/bot-message-context.test.ts
+++ b/extensions/line/src/bot-message-context.test.ts
@@ -335,6 +335,43 @@ describe("buildLineMessageContext", () => {
     });
   });
 
+  it("normalizes canonical LINE targets through the plugin bindings surface", async () => {
+    const compiled = linePlugin.bindings?.compileConfiguredBinding({
+      binding: {
+        type: "acp",
+        agentId: "codex",
+        match: { channel: "line", accountId: "default", peer: { kind: "direct", id: "unused" } },
+      } as AgentBinding,
+      conversationId: "line:U1234567890abcdef1234567890abcdef",
+    });
+
+    expect(compiled).toEqual({
+      conversationId: "U1234567890abcdef1234567890abcdef",
+    });
+    expect(
+      linePlugin.bindings?.resolveCommandConversation?.({
+        accountId: "default",
+        originatingTo: "line:U1234567890abcdef1234567890abcdef",
+      }),
+    ).toEqual({
+      conversationId: "U1234567890abcdef1234567890abcdef",
+    });
+    expect(
+      linePlugin.bindings?.matchInboundConversation({
+        binding: {
+          type: "acp",
+          agentId: "codex",
+          match: { channel: "line", accountId: "default", peer: { kind: "direct", id: "unused" } },
+        } as AgentBinding,
+        compiledBinding: compiled!,
+        conversationId: "U1234567890abcdef1234567890abcdef",
+      }),
+    ).toEqual({
+      conversationId: "U1234567890abcdef1234567890abcdef",
+      matchPriority: 2,
+    });
+  });
+
   it("routes LINE conversations through active ACP session bindings", async () => {
     const userId = "U1234567890abcdef1234567890abcdef";
     await getSessionBindingService().bind({
diff --git a/extensions/line/src/channel.ts b/extensions/line/src/channel.ts
index d5dd6506ec3..713c86d741d 100644
--- a/extensions/line/src/channel.ts
+++ b/extensions/line/src/channel.ts
@@ -17,7 +17,7 @@ function normalizeLineConversationId(raw?: string | null): string | null {
   if (!trimmed) {
     return null;
   }
-  const prefixed = trimmed.match(/^line:(?:user|group|room):(.+)$/i)?.[1];
+  const prefixed = trimmed.match(/^line:(?:(?:user|group|room):)?(.+)$/i)?.[1];
   return (prefixed ?? trimmed).trim() || null;
 }
 
diff --git a/src/auto-reply/reply/commands-acp/context.test.ts b/src/auto-reply/reply/commands-acp/context.test.ts
index b200e0eb251..9d3579a3ff3 100644
--- a/src/auto-reply/reply/commands-acp/context.test.ts
+++ b/src/auto-reply/reply/commands-acp/context.test.ts
@@ -201,6 +201,24 @@ describe("commands-acp context", () => {
     });
   });
 
+  it("resolves LINE conversation ids from canonical line targets", () => {
+    const params = buildCommandTestParams("/acp status", baseCfg, {
+      Provider: "line",
+      Surface: "line",
+      OriginatingChannel: "line",
+      OriginatingTo: "line:U1234567890abcdef1234567890abcdef",
+      AccountId: "work",
+    });
+
+    expect(resolveAcpCommandBindingContext(params)).toEqual({
+      channel: "line",
+      accountId: "work",
+      threadId: undefined,
+      conversationId: "U1234567890abcdef1234567890abcdef",
+    });
+    expect(resolveAcpCommandConversationId(params)).toBe("U1234567890abcdef1234567890abcdef");
+  });
+
   it("resolves Matrix thread context from the current room and thread root", () => {
     const params = buildCommandTestParams("/acp status", baseCfg, {
       Provider: "matrix",