diff --git a/packages/opencode/test/file/fff.test.ts b/packages/opencode/test/file/fff.test.ts
index c067ef57d0..33e4727b29 100644
--- a/packages/opencode/test/file/fff.test.ts
+++ b/packages/opencode/test/file/fff.test.ts
@@ -5,6 +5,11 @@ import { tmpdir } from "../fixture/fixture"
 import { Instance } from "../../src/project/instance"
 import { Fff } from "../../src/file/fff"
 
+async function write(file: string, body: string) {
+  await fs.mkdir(path.dirname(file), { recursive: true })
+  await fs.writeFile(file, body)
+}
+
 describe("file.fff", () => {
   test("allowed respects hidden filter", async () => {
     expect(Fff.allowed({ rel: "visible.txt", hidden: true })).toBe(true)
@@ -15,7 +20,7 @@ describe("file.fff", () => {
   test("search returns empty when nothing matches", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "match.ts"), "const value = 'other'\n")
+        await write(path.join(dir, "match.ts"), "const value = 'other'\n")
       },
     })
 
@@ -35,8 +40,8 @@ describe("file.fff", () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
         await fs.mkdir(path.join(dir, "a", "b"), { recursive: true })
-        await Bun.write(path.join(dir, "a", "b", "c.ts"), "export const x = 1\n")
-        await Bun.write(path.join(dir, "a", "d.ts"), "export const y = 1\n")
+        await write(path.join(dir, "a", "b", "c.ts"), "export const x = 1\n")
+        await write(path.join(dir, "a", "d.ts"), "export const y = 1\n")
       },
     })
 
diff --git a/packages/opencode/test/tool/glob.test.ts b/packages/opencode/test/tool/glob.test.ts
index e2c95adea0..08ed37bfb6 100644
--- a/packages/opencode/test/tool/glob.test.ts
+++ b/packages/opencode/test/tool/glob.test.ts
@@ -1,10 +1,16 @@
 import { describe, expect, test } from "bun:test"
+import fs from "fs/promises"
 import path from "path"
 import { GlobTool } from "../../src/tool/glob"
 import { Instance } from "../../src/project/instance"
 import { tmpdir } from "../fixture/fixture"
 import { SessionID, MessageID } from "../../src/session/schema"
 
+async function write(file: string, body: string) {
+  await fs.mkdir(path.dirname(file), { recursive: true })
+  await fs.writeFile(file, body)
+}
+
 const ctx = {
   sessionID: SessionID.make("ses_test"),
   messageID: MessageID.make(""),
@@ -20,9 +26,9 @@ describe("tool.glob", () => {
   test("finds files by glob pattern", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
-        await Bun.write(path.join(dir, "src", "bar.ts"), "export const bar = 1\n")
-        await Bun.write(path.join(dir, "src", "baz.js"), "export const baz = 1\n")
+        await write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
+        await write(path.join(dir, "src", "bar.ts"), "export const bar = 1\n")
+        await write(path.join(dir, "src", "baz.js"), "export const baz = 1\n")
       },
     })
 
@@ -48,7 +54,7 @@ describe("tool.glob", () => {
   test("returns no files found for unmatched patterns", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
+        await write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
       },
     })
 
@@ -73,9 +79,9 @@ describe("tool.glob", () => {
   test("falls back for brace glob patterns", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
-        await Bun.write(path.join(dir, "src", "bar.js"), "export const bar = 1\n")
-        await Bun.write(path.join(dir, "src", "baz.py"), "print('baz')\n")
+        await write(path.join(dir, "src", "foo.ts"), "export const foo = 1\n")
+        await write(path.join(dir, "src", "bar.js"), "export const bar = 1\n")
+        await write(path.join(dir, "src", "baz.py"), "print('baz')\n")
       },
     })
 
diff --git a/packages/opencode/test/tool/grep.test.ts b/packages/opencode/test/tool/grep.test.ts
index 6c06eab7b2..289013f77d 100644
--- a/packages/opencode/test/tool/grep.test.ts
+++ b/packages/opencode/test/tool/grep.test.ts
@@ -1,10 +1,16 @@
 import { describe, expect, test } from "bun:test"
+import fs from "fs/promises"
 import path from "path"
 import { GrepTool } from "../../src/tool/grep"
 import { Instance } from "../../src/project/instance"
 import { tmpdir } from "../fixture/fixture"
 import { SessionID, MessageID } from "../../src/session/schema"
 
+async function write(file: string, body: string) {
+  await fs.mkdir(path.dirname(file), { recursive: true })
+  await fs.writeFile(file, body)
+}
+
 const ctx = {
   sessionID: SessionID.make("ses_test"),
   messageID: MessageID.make(""),
@@ -41,7 +47,7 @@ describe("tool.grep", () => {
   test("no matches returns correct output", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "test.txt"), "hello world")
+        await write(path.join(dir, "test.txt"), "hello world")
       },
     })
     await Instance.provide({
@@ -65,8 +71,7 @@ describe("tool.grep", () => {
     // This test verifies the regex split handles both \n and \r\n
     await using tmp = await tmpdir({
       init: async (dir) => {
-        // Create a test file with content
-        await Bun.write(path.join(dir, "test.txt"), "line1\nline2\nline3")
+        await write(path.join(dir, "test.txt"), "line1\nline2\nline3")
       },
     })
     await Instance.provide({
@@ -88,7 +93,7 @@ describe("tool.grep", () => {
   test("broadens multi-word query when exact has no match", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "test.txt"), "upload completed\n")
+        await write(path.join(dir, "test.txt"), "upload completed\n")
       },
     })
     await Instance.provide({
@@ -111,7 +116,7 @@ describe("tool.grep", () => {
   test("suggests path when content has no match", async () => {
     await using tmp = await tmpdir({
       init: async (dir) => {
-        await Bun.write(path.join(dir, "src", "server", "auth.ts"), "export const token = 1\n")
+        await write(path.join(dir, "src", "server", "auth.ts"), "export const token = 1\n")
       },
     })
     await Instance.provide({