feat(tui): Editor specific settings on tui.json

packages/tui/src/component/prompt/index.tsx

@@ -437,6 +437,7 @@ export function Prompt(props: PromptProps) {
           const content = await openEditor({
             renderer,
             value,
+            config: tuiConfig.editor,
             cwd:
               (project.instance.path().worktree === "/" ? undefined : project.instance.path().worktree) ||
               project.instance.directory() ||

packages/tui/src/config/index.tsx

@@ -50,6 +50,15 @@ export const Prompt = Schema.Struct({
   }),
 }).annotate({ description: "Prompt size settings" })
 
+export const EditorConfig = Schema.Struct({
+  editor_path: Schema.optional(Schema.String).annotate({
+    description: "Editor command (overrides VISUAL/EDITOR environment variables)",
+  }),
+  editor_temp_dir: Schema.optional(Schema.String).annotate({
+    description: "Temporary directory for editor temp files (default: OS tmp dir)",
+  }),
+}).annotate({ description: "Editor settings" })
+
 export const Info = Schema.Struct({
   $schema: Schema.optional(Schema.String),
   theme: Schema.optional(Schema.String),
@@ -58,6 +67,7 @@ export const Info = Schema.Struct({
   plugin_enabled: Schema.optional(Schema.Record(Schema.String, Schema.Boolean)),
   leader_timeout: Schema.optional(LeaderTimeout),
   attention: Schema.optional(Attention),
+  editor: Schema.optional(EditorConfig),
   prompt: Schema.optional(Prompt),
   scroll_speed: Schema.optional(ScrollSpeed).annotate({ description: "TUI scroll speed" }),
   scroll_acceleration: Schema.optional(ScrollAcceleration),

packages/tui/src/editor.ts

@@ -23,10 +23,21 @@ export function normalizePromptContent(content: string) {
   return content
 }
 
-export async function openEditor(input: { value: string; renderer: CliRenderer; cwd?: string; stdin?: EditorStdio }) {
-  const editor = process.env.VISUAL || process.env.EDITOR
+export type EditorConfig = {
+  editor_path?: string
+  editor_temp_dir?: string
+}
+
+export async function openEditor(input: {
+  value: string
+  renderer: CliRenderer
+  cwd?: string
+  stdin?: EditorStdio
+  config?: EditorConfig
+}) {
+  const editor = input.config?.editor_path || process.env.VISUAL || process.env.EDITOR
   if (!editor) return
-  const file = path.join(os.tmpdir(), `${Date.now()}.md`)
+  const file = path.join(input.config?.editor_temp_dir ?? os.tmpdir(), `${Date.now()}.md`)
   await writeFile(file, input.value)
   input.renderer.suspend()
   input.renderer.currentRenderBuffer.clear()

packages/tui/src/routes/session/index.tsx

@@ -978,10 +978,11 @@ export function Session() {
           )
 
           if (options.openWithoutSaving) {
-            // Just open in editor without saving
+            // Just open in editor without saving — use os.tmpdir() not user-configured temp dir
             await openEditor({
               renderer,
               value: transcript,
+              config: { ...tuiConfig.editor, editor_temp_dir: undefined },
               cwd:
                 (project.instance.path().worktree === "/" ? undefined : project.instance.path().worktree) ||
                 project.instance.directory() ||
@@ -998,11 +999,17 @@ export function Session() {
             const result = await openEditor({
               renderer,
               value: transcript,
+              config: tuiConfig.editor,
               cwd:
                 (project.instance.path().worktree === "/" ? undefined : project.instance.path().worktree) ||
                 project.instance.directory() ||
                 paths.cwd,
+            }).catch((e) => {
+              // File was already saved above. Opening the editor afterward is
+              // best-effort — swallow errors so they don't reach the outer
+              // catch block, which would incorrectly show "Failed to export".
             })
+
             if (result !== undefined) {
               await writeExport(filepath, result)
             }