Mobile app doesn't render thinking trace from remote Copilot sessions

**Mood:** 😔
**Category:** Bug

The GitHub mobile app doesn't render the thinking / reasoning trace from remote Copilot Coding Agent sessions. The same session viewed on github.com (desktop or mobile browser) shows the full extended-thinking output between tool calls; the native mobile app only shows tool calls and the final response.

This makes it hard to follow long-running remote sessions from a phone — which is exactly the surface where you most want to peek in without booting a laptop. You either see "the agent ran N tools and stopped" with no insight into its plan, or you give up and switch to mobile-browser github.com (which works, per workaround below).

**Repro**
1. Start a remote Copilot Coding Agent session on github.com that triggers extended thinking (any non-trivial task).
2. While it is running (or after), open the same session in the GitHub mobile app.
3. Compare to the same session in mobile browser → github.com.

**Expected:** thinking blocks render between tool calls, same as desktop / mobile browser.

**Actual:** thinking blocks are absent; only tool calls and final response are shown.

**Workaround:** open github.com in Chrome/Firefox on the device instead of the native app.

Originally raised at orgs/community/discussions/197451 — filing here in case the desktop/CLI Copilot team owns part of the wire format. If the mobile client team owns the rendering, please route accordingly.

---
| Field | Value |
| --- | --- |
| App version | (GitHub mobile app version — please fill in before submitting) |
| OS | (Android or iOS ) |
| Theme | (System / Light / Dark) |
| Path | Remote Copilot session view |
| Tenure | (Week N) |

Start by reproducing the remote Copilot session in the native GitHub mobile app and comparing it with the same session on github.com in a mobile browser. Use a session that triggers extended thinking; done means thinking blocks appear between tool calls in the app, matching the browser view. The issue names no files or tests, and the app version and OS still need to be supplied.

由索引模型根据 Issue 内容生成。