From d3ecd820040ff14a4334a30135620b72dedde501 Mon Sep 17 00:00:00 2001
From: zhangsan <15572837359@163.com>
Date: Mon, 15 Jun 2026 21:08:26 +0800
Subject: [PATCH] =?UTF-8?q?fix(config):=20=E4=BF=AE=E5=A4=8D=20shell=20?=
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RenderTOMLForScope 渲染 [tools] 段时没有输出 [tools.shell]，
导致用户切换 shell 后配置保存到磁盘时丢失，重启后回到 auto。

添加 [tools.shell] 的 prefer 和 path 字段序列化。

Fixes #4447
---
 internal/config/render.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/internal/config/render.go b/internal/config/render.go
index b1b9c74e4..4d1d75989 100644
--- a/internal/config/render.go
+++ b/internal/config/render.go
@@ -299,6 +299,19 @@ func RenderTOMLForScope(c *Config, scope RenderScope) string {
 	}
 	fmt.Fprintf(&b, "bash_timeout_seconds = %d   # foreground safety cap; set 0 for no tool-local cap\n\n", c.BashTimeoutSeconds())
 
+	b.WriteString("[tools.shell]\n")
+	if c.Tools.Shell.Prefer != "" {
+		fmt.Fprintf(&b, "prefer = %q\n", c.Tools.Shell.Prefer)
+	} else {
+		b.WriteString("# prefer = \"\"   # auto | bash | powershell | pwsh\n")
+	}
+	if c.Tools.Shell.Path != "" {
+		fmt.Fprintf(&b, "path   = %q\n", c.Tools.Shell.Path)
+	} else {
+		b.WriteString("# path   = \"\"   # empty = probe standard locations\n")
+	}
+	b.WriteString("\n")
+
 	b.WriteString("[codegraph]\n")
 	fmt.Fprintf(&b, "enabled      = %v   # built-in MCP server; off by default for first-run sessions\n", c.Codegraph.Enabled)
 	fmt.Fprintf(&b, "auto_install = %v   # fetch the runtime when CodeGraph is enabled but missing\n", c.Codegraph.AutoInstall)