diff --git a/src/cli/config-manager/auth-plugins.ts b/src/cli/config-manager/auth-plugins.ts
index 7bbc8b81..577d80a2 100644
--- a/src/cli/config-manager/auth-plugins.ts
+++ b/src/cli/config-manager/auth-plugins.ts
@@ -1,4 +1,4 @@
-import { writeFileSync } from "node:fs"
+import { readFileSync, writeFileSync } from "node:fs"
 import type { ConfigMergeResult, InstallConfig } from "../types"
 import { getConfigDir } from "./config-context"
 import { ensureConfigDirectoryExists } from "./ensure-config-directory-exists"
@@ -55,7 +55,27 @@ export async function addAuthPlugins(config: InstallConfig): Promise<ConfigMerge
     }
 
     const newConfig = { ...(existingConfig ?? {}), plugin: plugins }
-    writeFileSync(path, JSON.stringify(newConfig, null, 2) + "\n")
+
+    if (format === "jsonc") {
+      const content = readFileSync(path, "utf-8")
+      const pluginArrayRegex = /"plugin"\s*:\s*\[([\s\S]*?)\]/
+      const match = content.match(pluginArrayRegex)
+
+      if (match) {
+        const formattedPlugins = plugins.map((p) => `"${p}"`).join(",\n    ")
+        const newContent = content.replace(
+          pluginArrayRegex,
+          `"plugin": [\n    ${formattedPlugins}\n  ]`
+        )
+        writeFileSync(path, newContent)
+      } else {
+        const inlinePlugins = plugins.map((p) => `"${p}"`).join(", ")
+        const newContent = content.replace(/(\{)/, `$1\n  "plugin": [${inlinePlugins}],`)
+        writeFileSync(path, newContent)
+      }
+    } else {
+      writeFileSync(path, JSON.stringify(newConfig, null, 2) + "\n")
+    }
     return { success: true, configPath: path }
   } catch (err) {
     return {
diff --git a/src/cli/config-manager/bun-install.ts b/src/cli/config-manager/bun-install.ts
index daf56fc0..052617e4 100644
--- a/src/cli/config-manager/bun-install.ts
+++ b/src/cli/config-manager/bun-install.ts
@@ -18,8 +18,8 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
   try {
     const proc = Bun.spawn(["bun", "install"], {
       cwd: getConfigDir(),
-      stdout: "pipe",
-      stderr: "pipe",
+      stdout: "inherit",
+      stderr: "inherit",
     })
 
     let timeoutId: ReturnType<typeof setTimeout>
@@ -44,10 +44,9 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
     }
 
     if (proc.exitCode !== 0) {
-      const stderr = await new Response(proc.stderr).text()
       return {
         success: false,
-        error: stderr.trim() || `bun install failed with exit code ${proc.exitCode}`,
+        error: `bun install failed with exit code ${proc.exitCode}`,
       }
     }
 
diff --git a/src/cli/run/event-formatting.ts b/src/cli/run/event-formatting.ts
index f9056641..2e6e2e08 100644
--- a/src/cli/run/event-formatting.ts
+++ b/src/cli/run/event-formatting.ts
@@ -103,9 +103,19 @@ export function logEventVerbose(ctx: RunContext, payload: EventPayload): void {
       const toolProps = props as ToolExecuteProps | undefined
       const toolName = toolProps?.name ?? "unknown"
       const input = toolProps?.input ?? {}
-      const inputStr = JSON.stringify(input).slice(0, 150)
+      let inputStr: string
+      try {
+        inputStr = JSON.stringify(input)
+      } catch {
+        try {
+          inputStr = String(input)
+        } catch {
+          inputStr = "[unserializable]"
+        }
+      }
+      const inputPreview = inputStr.slice(0, 150)
       console.error(pc.cyan(`${sessionTag} TOOL.EXECUTE: ${pc.bold(toolName)}`))
-      console.error(pc.dim(`   input: ${inputStr}${inputStr.length >= 150 ? "..." : ""}`))
+      console.error(pc.dim(`   input: ${inputPreview}${inputStr.length >= 150 ? "..." : ""}`))
       break
     }
 
diff --git a/src/cli/tui-install-prompts.ts b/src/cli/tui-install-prompts.ts
index e817427c..7b6d03b5 100644
--- a/src/cli/tui-install-prompts.ts
+++ b/src/cli/tui-install-prompts.ts
@@ -12,6 +12,8 @@ async function selectOrCancel<TValue extends Readonly<string | boolean | number>
   options: Option<TValue>[]
   initialValue: TValue
 }): Promise<TValue | null> {
+  if (!process.stdin.isTTY) return null
+
   const value = await p.select<TValue>({
     message: params.message,
     options: params.options,