diff --git a/packages/opencode/src/config/migrate-tui-config.ts b/packages/opencode/src/config/migrate-tui-config.ts
index b426e4fbd1..a59574b8d3 100644
--- a/packages/opencode/src/config/migrate-tui-config.ts
+++ b/packages/opencode/src/config/migrate-tui-config.ts
@@ -1,6 +1,6 @@
 import path from "path"
 import { type ParseError as JsoncParseError, applyEdits, modify, parse as parseJsonc } from "jsonc-parser"
-import { unique } from "remeda"
+import { mergeDeep, unique } from "remeda"
 import z from "zod"
 import { ConfigPaths } from "./paths"
 import { TuiInfo, TuiOptions } from "./tui-schema"
@@ -31,72 +31,104 @@ interface MigrateInput {
   managed: string
 }
 
+interface SourceGroup {
+  target: string
+  files: string[]
+}
+
+interface LegacyFile {
+  file: string
+  source: string
+  legacy: Record<string, unknown>
+}
+
 /**
- * Migrates tui-specific keys (theme, keybinds, tui) from opencode.json files
- * into dedicated tui.json files. Migration is performed per-directory and
- * skips only locations where a tui.json already exists.
+ * Migrates tui-specific keys (theme, keybinds, tui) from server config files
+ * into dedicated tui.json files. Source files are merged in server precedence
+ * order before writing each target tui.json.
  */
 export async function migrateTuiConfig(input: MigrateInput) {
-  const opencode = await opencodeFiles(input)
-  for (const file of opencode) {
-    const source = await Filesystem.readText(file).catch((error) => {
-      log.warn("failed to read config for tui migration", { path: file, error })
-      return undefined
-    })
-    if (!source) continue
-    const errors: JsoncParseError[] = []
-    const data = parseJsonc(source, errors, { allowTrailingComma: true })
-    if (errors.length || !data || typeof data !== "object" || Array.isArray(data)) continue
-
-    const theme = LegacyTheme.safeParse("theme" in data ? data.theme : undefined)
-    const keybinds = LegacyRecord.safeParse("keybinds" in data ? data.keybinds : undefined)
-    const legacyTui = LegacyRecord.safeParse("tui" in data ? data.tui : undefined)
-    const extracted = {
-      theme: theme.success ? theme.data : undefined,
-      keybinds: keybinds.success ? keybinds.data : undefined,
-      tui: legacyTui.success ? legacyTui.data : undefined,
-    }
-    const tui = extracted.tui ? normalizeTui(extracted.tui) : undefined
-    if (extracted.theme === undefined && extracted.keybinds === undefined && !tui) continue
-
-    const target = path.join(path.dirname(file), "tui.json")
-    const targetExists = await Filesystem.exists(target)
+  const groups = await sourceGroups(input)
+  for (const group of groups) {
+    const targetExists = await Filesystem.exists(group.target)
     if (targetExists) continue
 
-    const payload: Record<string, unknown> = {
-      $schema: TUI_SCHEMA_URL,
-    }
-    if (extracted.theme !== undefined) payload.theme = extracted.theme
-    if (extracted.keybinds !== undefined) payload.keybinds = extracted.keybinds
-    if (tui) Object.assign(payload, tui)
+    const parsed = (await Promise.all(group.files.map(parseLegacyFile))).filter((item): item is LegacyFile => !!item)
+    if (!parsed.length) continue
 
-    const wrote = await Bun.write(target, JSON.stringify(payload, null, 2))
+    const payload = parsed.reduce((acc, item) => mergeDeep(acc, item.legacy), { $schema: TUI_SCHEMA_URL } as Record<
+      string,
+      unknown
+    >)
+
+    const wrote = await Bun.write(group.target, JSON.stringify(payload, null, 2))
       .then(() => true)
       .catch((error) => {
-        log.warn("failed to write tui migration target", { from: file, to: target, error })
+        log.warn("failed to write tui migration target", {
+          from: parsed.map((item) => item.file),
+          to: group.target,
+          error,
+        })
         return false
       })
     if (!wrote) continue
 
-    const stripped = await backupAndStripLegacy(file, source)
-    if (!stripped) {
-      log.warn("tui config migrated but source file was not stripped", { from: file, to: target })
+    const stripped = await Promise.all(parsed.map((item) => backupAndStripLegacy(item.file, item.source)))
+    if (stripped.some((ok) => !ok)) {
+      log.warn("tui config migrated but some source files were not stripped", {
+        from: parsed.map((item) => item.file),
+        to: group.target,
+      })
       continue
     }
-    log.info("migrated tui config", { from: file, to: target })
+
+    log.info("migrated tui config", {
+      from: parsed.map((item) => item.file),
+      to: group.target,
+    })
+  }
+}
+
+async function parseLegacyFile(file: string) {
+  const source = await Filesystem.readText(file).catch((error) => {
+    log.warn("failed to read config for tui migration", { path: file, error })
+    return undefined
+  })
+  if (!source) return
+
+  const errors: JsoncParseError[] = []
+  const data = parseJsonc(source, errors, { allowTrailingComma: true })
+  if (errors.length || !data || typeof data !== "object" || Array.isArray(data)) return
+
+  const theme = LegacyTheme.safeParse("theme" in data ? data.theme : undefined)
+  const keybinds = LegacyRecord.safeParse("keybinds" in data ? data.keybinds : undefined)
+  const legacyTui = LegacyRecord.safeParse("tui" in data ? data.tui : undefined)
+  const tui = legacyTui.success && legacyTui.data ? normalizeTui(legacyTui.data) : undefined
+
+  const legacy: Record<string, unknown> = {}
+  if (theme.success && theme.data !== undefined) legacy.theme = theme.data
+  if (keybinds.success && keybinds.data !== undefined) legacy.keybinds = keybinds.data
+  if (tui) Object.assign(legacy, tui)
+  if (!Object.keys(legacy).length) return
+
+  return {
+    file,
+    source,
+    legacy,
   }
 }
 
 function normalizeTui(data: Record<string, unknown>) {
-  const parsed = TuiLegacy.parse(data)
+  const parsed = TuiLegacy.safeParse(data)
+  if (!parsed.success) return
   if (
-    parsed.scroll_speed === undefined &&
-    parsed.diff_style === undefined &&
-    parsed.scroll_acceleration === undefined
+    parsed.data.scroll_speed === undefined &&
+    parsed.data.diff_style === undefined &&
+    parsed.data.scroll_acceleration === undefined
   ) {
     return
   }
-  return parsed
+  return parsed.data
 }
 
 async function backupAndStripLegacy(file: string, source: string) {
@@ -134,15 +166,24 @@ async function backupAndStripLegacy(file: string, source: string) {
     })
 }
 
-async function opencodeFiles(input: { directories: string[]; managed: string }) {
-  const project = Flag.OPENCODE_DISABLE_PROJECT_CONFIG
-    ? []
-    : await ConfigPaths.projectFiles("opencode", Instance.directory, Instance.worktree)
-  const files = [...project, ...ConfigPaths.fileInDirectory(Global.Path.config, "opencode")]
+async function sourceGroups(input: MigrateInput): Promise<SourceGroup[]> {
+  const files = [
+    path.join(Global.Path.config, "config.json"),
+    path.join(Global.Path.config, "opencode.json"),
+    path.join(Global.Path.config, "opencode.jsonc"),
+  ]
+
+  if (input.custom) files.push(input.custom)
+
+  if (!Flag.OPENCODE_DISABLE_PROJECT_CONFIG) {
+    files.push(...(await ConfigPaths.projectFiles("opencode", Instance.directory, Instance.worktree)))
+  }
+
   for (const dir of unique(input.directories)) {
+    if (!dir.endsWith(".opencode") && dir !== Flag.OPENCODE_CONFIG_DIR) continue
     files.push(...ConfigPaths.fileInDirectory(dir, "opencode"))
   }
-  if (Flag.OPENCODE_CONFIG) files.push(Flag.OPENCODE_CONFIG)
+
   files.push(...ConfigPaths.fileInDirectory(input.managed, "opencode"))
 
   const existing = await Promise.all(
@@ -151,5 +192,16 @@ async function opencodeFiles(input: { directories: string[]; managed: string })
       return ok ? file : undefined
     }),
   )
-  return existing.filter((file): file is string => !!file)
+
+  const result = new Map<string, string[]>()
+  for (const file of existing) {
+    if (!file) continue
+    const target = path.join(path.dirname(file), "tui.json")
+    result.set(target, [...(result.get(target) ?? []), file])
+  }
+
+  return Array.from(result.entries()).map(([target, groupFiles]) => ({
+    target,
+    files: groupFiles,
+  }))
 }
diff --git a/packages/opencode/test/config/tui.test.ts b/packages/opencode/test/config/tui.test.ts
index f9de5b041b..0218cd939d 100644
--- a/packages/opencode/test/config/tui.test.ts
+++ b/packages/opencode/test/config/tui.test.ts
@@ -80,6 +80,62 @@ test("migrates tui-specific keys from opencode.json when tui.json does not exist
   })
 })
 
+test("merges legacy tui keys from opencode.jsonc and opencode.json before migrating", async () => {
+  await using tmp = await tmpdir({
+    init: async (dir) => {
+      await Bun.write(
+        path.join(dir, "opencode.jsonc"),
+        `{
+  "theme": "from-jsonc",
+  "tui": { "scroll_speed": 2 },
+  "keybinds": { "app_exit": "ctrl+q" }
+}`,
+      )
+      await Bun.write(
+        path.join(dir, "opencode.json"),
+        JSON.stringify(
+          {
+            theme: "from-json",
+            keybinds: { theme_list: "ctrl+k" },
+          },
+          null,
+          2,
+        ),
+      )
+    },
+  })
+
+  await Instance.provide({
+    directory: tmp.path,
+    fn: async () => {
+      const config = await TuiConfig.get()
+      expect(config.theme).toBe("from-json")
+      expect(config.scroll_speed).toBe(2)
+      expect(config.keybinds?.app_exit).toBe("ctrl+q")
+      expect(config.keybinds?.theme_list).toBe("ctrl+k")
+
+      const text = await Filesystem.readText(path.join(tmp.path, "tui.json"))
+      expect(JSON.parse(text)).toMatchObject({
+        theme: "from-json",
+        scroll_speed: 2,
+        keybinds: { app_exit: "ctrl+q", theme_list: "ctrl+k" },
+      })
+
+      const json = JSON.parse(await Filesystem.readText(path.join(tmp.path, "opencode.json")))
+      expect(json.theme).toBeUndefined()
+      expect(json.keybinds).toBeUndefined()
+
+      const jsonc = await Filesystem.readText(path.join(tmp.path, "opencode.jsonc"))
+      expect(jsonc).not.toContain('"theme"')
+      expect(jsonc).not.toContain('"keybinds"')
+      expect(jsonc).not.toContain('"tui"')
+
+      expect(await Filesystem.exists(path.join(tmp.path, "opencode.json.tui-migration.bak"))).toBe(true)
+      expect(await Filesystem.exists(path.join(tmp.path, "opencode.jsonc.tui-migration.bak"))).toBe(true)
+    },
+  })
+})
+
 test("migrates project legacy tui keys even when global tui.json already exists", async () => {
   await using tmp = await tmpdir({
     init: async (dir) => {