diff --git a/src/tui/tui-pty-harness.e2e.test.ts b/src/tui/tui-pty-harness.e2e.test.ts
index dc1a7e52f31a..3dc889765b19 100644
--- a/src/tui/tui-pty-harness.e2e.test.ts
+++ b/src/tui/tui-pty-harness.e2e.test.ts
@@ -916,6 +916,34 @@ describe.sequential("TUI PTY harness", () => {
     TEST_TIMEOUT_MS,
   );
 
+  it.each([
+    {
+      sessionKey: "agent:main:matrix:channel:!MixedRoomAbCdEf:example.org",
+      message: "mixed-case matrix session identity proof",
+    },
+    {
+      sessionKey: "agent:main:signal:group:AbC123=",
+      message: "mixed-case signal session identity proof",
+    },
+  ])(
+    "preserves provider-owned identity when selecting $sessionKey in the terminal",
+    async ({ sessionKey, message }) => {
+      await fixture.run.write(`/session ${sessionKey}\r`, { delay: false });
+      await fixture.waitForLogEntry(
+        (entry) =>
+          entry.method === "loadHistory" && objectFieldEquals(entry, "sessionKey", sessionKey),
+      );
+
+      await fixture.run.write(`${message}\r`, { delay: false });
+      const sent = await fixture.waitForLogEntry(
+        (entry) => entry.method === "sendChat" && objectFieldEquals(entry, "message", message),
+      );
+
+      expect(sent.payload).toMatchObject({ sessionKey, message });
+    },
+    TEST_TIMEOUT_MS,
+  );
+
   it(
     "creates a backend session from /new and adopts its canonical key",
     async () => {
diff --git a/src/tui/tui.test.ts b/src/tui/tui.test.ts
index a650403151b7..b4e6a47ecd72 100644
--- a/src/tui/tui.test.ts
+++ b/src/tui/tui.test.ts
@@ -186,6 +186,50 @@ describe("resolveTuiSessionKey", () => {
     ).toBe("agent:ops:incident");
   });
 
+  it.each([
+    {
+      raw: "agent:main:matrix:channel:!MixedRoomAbCdEf:example.org",
+      expected: "agent:main:matrix:channel:!MixedRoomAbCdEf:example.org",
+    },
+    {
+      raw: "Matrix:Channel:!MixedRoomAbCdEf:example.org",
+      expected: "agent:main:matrix:channel:!MixedRoomAbCdEf:example.org",
+    },
+    {
+      raw: "Agent:Main:Matrix:Channel:!MixedRoomAbCdEf:example.org:Thread:$EventAbCdEf",
+      expected: "agent:main:matrix:channel:!MixedRoomAbCdEf:example.org:thread:$EventAbCdEf",
+    },
+    {
+      raw: "Agent:Ops:Matrix:Channel:!MixedRoomAbCdEf:example.org",
+      expected: "agent:ops:matrix:channel:!MixedRoomAbCdEf:example.org",
+    },
+    {
+      raw: "agent:main:signal:group:AbC123=",
+      expected: "agent:main:signal:group:AbC123=",
+    },
+    {
+      raw: "Agent:Ops:Signal:Group:AbC123=",
+      expected: "agent:ops:signal:group:AbC123=",
+    },
+    {
+      raw: "Signal:Group:AbC123=",
+      expected: "agent:main:signal:group:AbC123=",
+    },
+    {
+      raw: "Telegram:Group:MixedHandle",
+      expected: "agent:main:telegram:group:mixedhandle",
+    },
+  ])("preserves canonical provider-owned session identity for $raw", ({ raw, expected }) => {
+    expect(
+      resolveTuiSessionKey({
+        raw,
+        sessionScope: "per-sender",
+        currentAgentId: "main",
+        sessionMainKey: "main",
+      }),
+    ).toBe(expected);
+  });
+
   it("lowercases session keys with uppercase characters", () => {
     // Uppercase in agent-prefixed form
     expect(
diff --git a/src/tui/tui.ts b/src/tui/tui.ts
index 18b4207de764..6134d717a23d 100644
--- a/src/tui/tui.ts
+++ b/src/tui/tui.ts
@@ -13,7 +13,6 @@ import {
   Text,
   TUI,
 } from "@earendil-works/pi-tui";
-import { normalizeLowercaseStringOrEmpty } from "@openclaw/normalization-core/string-coerce";
 import type { CommandEntry } from "../../packages/gateway-protocol/src/index.js";
 import { resolveAgentIdByWorkspacePath, resolveDefaultAgentId } from "../agents/agent-scope.js";
 import { normalizeThinkLevel } from "../auto-reply/thinking.shared.js";
@@ -35,6 +34,7 @@ import {
   normalizeAgentId,
   normalizeMainKey,
   parseAgentSessionKey,
+  toAgentStoreSessionKey,
 } from "../routing/session-key.js";
 import { getSlashCommands, shouldSubmitExactArgumentCompletion } from "./commands.js";
 import { ChatLog } from "./components/chat-log.js";
@@ -213,10 +213,11 @@ export function resolveTuiSessionKey(params: {
   if (trimmed === "global" || trimmed === "unknown") {
     return trimmed;
   }
-  if (trimmed.startsWith("agent:")) {
-    return normalizeLowercaseStringOrEmpty(trimmed);
-  }
-  return `agent:${params.currentAgentId}:${normalizeLowercaseStringOrEmpty(trimmed)}`;
+  return toAgentStoreSessionKey({
+    agentId: params.currentAgentId,
+    requestKey: trimmed,
+    mainKey: params.sessionMainKey,
+  });
 }
 
 export function resolveInitialTuiAgentId(params: {