# v0.27.9 Release Notes

> v0.27.8 -> v0.27.9

## Summary

Hardens runtime resilience with provider cooldown, dispatcher retry-with-fallback, and automatic MCP reconnection. Adds user-facing controls for history compaction and reasoning-level selection alongside a copilot priority boost path.

<details>
<summary>翻譯</summary>

強化執行期韌性：provider 冷卻機制、dispatcher 帶 fallback 的重試、MCP 自動重連。新增使用者可控的歷史壓縮與推理等級選擇，並加入 copilot 優先提升路徑。

</details>

## Changes

### FEAT
- Add LLM-based history compaction via /compact command (@pardnchiu) [61029c9]
- Add dispatcher retry with fallback and tool activity display in TUI thinking line (@pardnchiu) [0322248]
- Add MCP reconnect flow with status display and server info (@pardnchiu) [3636c7a]
- Add reasoning level control and copilot priority boost (@pardnchiu) [84b3730]

<details>
<summary>翻譯</summary>

- 新增基於 LLM 的歷史壓縮功能，透過 /compact 指令觸發
- 新增 dispatcher 帶 fallback 的重試機制，並於 TUI thinking 行顯示 tool 活動
- 新增 MCP 重連流程，含狀態顯示與 server 資訊
- 新增推理等級控制與 copilot 優先提升

</details>

### FIX
- Fix rate-limit handling and add provider cooldown mechanism (@pardnchiu) [adfbb6b]

<details>
<summary>翻譯</summary>

- 修正 rate-limit 處理並新增 provider 冷卻機制

</details>

## Scope

- `cmd/app/` — FEAT (`cmdDeamon.go`, `newTUI.go`)
- `configs/` — FEAT (`configs.go`, `compact_history_prompt.md`)
- `internal/agents/exec/` — FEAT, FIX (`compact.go`, `cooldown.go`, `execute.go`, `reset.go`, `selectAgent.go`)
- `internal/agents/exec/summary/` — FEAT (`generate.go`)
- `internal/agents/provider/openaiCodex/` — FIX (`send.go`)
- `internal/runtime/tui/` — FEAT, FIX (multiple files)
- `internal/session/` — FEAT (`history/replace.go`, `history/store/store.go`, `log/compact.go`)
- `internal/toolAdapter/mcp/` — FEAT (`mcp.go`)
- `internal/tools/` — FEAT, FIX (`register/register.go`, `external/googleRSS/register.go`)

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