diff --git a/packages/opencode/src/cli/cmd/tui/context/exit.tsx b/packages/opencode/src/cli/cmd/tui/context/exit.tsx
index 9724726f..253683d2 100644
--- a/packages/opencode/src/cli/cmd/tui/context/exit.tsx
+++ b/packages/opencode/src/cli/cmd/tui/context/exit.tsx
@@ -37,11 +37,14 @@ export const { use: useExit, provider: ExitProvider } = createSimpleContext({
           // Reset window title before destroying renderer
           renderer.setTerminalTitle("")
           renderer.destroy()
-          // SGR reset + show cursor + OSC 110/111/112 reset terminal fg/bg/cursor color.
-          // Without the OSC resets, whatever fg/bg the active mimocode theme pushed
-          // via OSC 10/11/12 would persist in the terminal session, leaving the
-          // shell prompt unreadable (e.g. white-on-white).
-          process.stdout.write("\x1b[0m\x1b[?25h\x1b]110\x07\x1b]111\x07\x1b]112\x07")
+          // Disable mouse event tracking (X10/buttons/all-motion/SGR) + SGR reset +
+          // show cursor + OSC 110/111/112 reset terminal fg/bg/cursor color.
+          // Without mouse disable, abnormal exit (e.g. killed by signal) leaves the
+          // terminal in mouse-tracking mode, producing garbage [row;colM sequences on
+          // every mouse move. Without the OSC resets, whatever fg/bg the active
+          // mimocode theme pushed via OSC 10/11/12 would persist in the terminal
+          // session, leaving the shell prompt unreadable (e.g. white-on-white).
+          process.stdout.write("\x1b[?1000l\x1b[?1002l\x1b[?1003l\x1b[?1006l\x1b[0m\x1b[?25h\x1b]110\x07\x1b]111\x07\x1b]112\x07")
           win32FlushInputBuffer()
           if (reason) {
             const formatted = FormatError(reason) ?? FormatUnknownError(reason)
@@ -60,6 +63,9 @@ export const { use: useExit, provider: ExitProvider } = createSimpleContext({
       },
     )
     process.on("SIGHUP", () => exit())
+    process.on("SIGINT", () => exit())
+    process.on("SIGTERM", () => exit())
+    process.on("beforeExit", () => exit())
     return exit
   },
 })
diff --git a/packages/opencode/src/cli/cmd/tui/thread.ts b/packages/opencode/src/cli/cmd/tui/thread.ts
index 487554ab..72b7690f 100644
--- a/packages/opencode/src/cli/cmd/tui/thread.ts
+++ b/packages/opencode/src/cli/cmd/tui/thread.ts
@@ -168,6 +168,8 @@ export const TuiThreadCommand = cmd({
       process.on("uncaughtException", error)
       process.on("unhandledRejection", error)
       process.on("SIGUSR2", reload)
+      process.on("SIGINT", () => stop())
+      process.on("SIGTERM", () => stop())
 
       let stopped = false
       const stop = async () => {
diff --git a/packages/opencode/src/project/project.ts b/packages/opencode/src/project/project.ts
index 1970afdb..4fc609ce 100644
--- a/packages/opencode/src/project/project.ts
+++ b/packages/opencode/src/project/project.ts
@@ -19,6 +19,8 @@ import * as CrossSpawnSpawner from "@/effect/cross-spawn-spawner"
 import { zod } from "@/util/effect-zod"
 import { withStatics } from "@/util/schema"
 
+// Best-effort: never let project-id bookkeeping crash startup (e.g. EEXIST/EPERM
+// from mkdir on Windows network drives or read-only .git dirs).
 async function setupProjectIdEnvironment(workingDir: string): Promise<void> {
   const mainGit = resolveMainGitDir(workingDir)
   if (!mainGit) return
@@ -29,19 +31,19 @@ async function setupProjectIdEnvironment(workingDir: string): Promise<void> {
   if (await Bun.file(localFile).exists()) {
     if (!(await Bun.file(idFile).exists())) {
       const id = await Bun.file(localFile).text()
-      await Bun.write(idFile, id)
+      await Bun.write(idFile, id).catch(() => {})
     }
     await nodeFs.unlink(localFile).catch(() => {})
   }
 
   // Belt-and-suspenders: ensure .git/info/exclude lists .mimocode-project-id
   const excludeFile = nodePath.join(mainGit, "info", "exclude")
-  await nodeFs.mkdir(nodePath.dirname(excludeFile), { recursive: true })
+  await nodeFs.mkdir(nodePath.dirname(excludeFile), { recursive: true }).catch(() => {})
   const existing = await Bun.file(excludeFile)
     .text()
     .catch(() => "")
   if (!existing.includes(".mimocode-project-id")) {
-    await nodeFs.appendFile(excludeFile, "\n.mimocode-project-id\n")
+    await nodeFs.appendFile(excludeFile, "\n.mimocode-project-id\n").catch(() => {})
   }
 }
 
diff --git a/packages/opencode/src/util/log.ts b/packages/opencode/src/util/log.ts
index 09675e27..44bd9721 100644
--- a/packages/opencode/src/util/log.ts
+++ b/packages/opencode/src/util/log.ts
@@ -15,6 +15,9 @@ const levelPriority: Record<Level, number> = {
   ERROR: 3,
 }
 const keep = 10
+// Cap individual log files so runaway logging can't fill the disk; with `keep`
+// pruning this bounds the log directory to roughly keep * maxFileSize.
+const maxFileSize = 20 * 1024 * 1024
 
 let level: Level = "INFO"
 
@@ -79,7 +82,21 @@ export async function init(options: Options) {
     await fs.truncate(logpath).catch(() => {})
   }
   const stream = createWriteStream(logpath, { flags: "a" })
+  let written = (await fs.stat(logpath).catch(() => null))?.size ?? 0
+  let rotations = 0
+  const rotate = () => {
+    stream.end()
+    rotations++
+    const stamp = new Date().toISOString().split(".")[0].replace(/:/g, "")
+    // Counter suffix keeps the name unique even when rotating within a second
+    logpath = path.join(Global.Path.log, `${stamp}_${rotations}.log`)
+    stream = createWriteStream(logpath, { flags: "a" })
+    written = 0
+    void cleanup(Global.Path.log)
+  }
   write = async (msg: any) => {
+    if (!options.dev && written >= maxFileSize) rotate()
+    written += Buffer.byteLength(msg)
     return new Promise((resolve, reject) => {
       stream.write(msg, (err) => {
         if (err) reject(err)
@@ -91,7 +108,7 @@ export async function init(options: Options) {
 
 async function cleanup(dir: string) {
   const files = (
-    await Glob.scan("????-??-??T??????.log", {
+    await Glob.scan("????-??-??T??????*.log", {
       cwd: dir,
       absolute: false,
       include: "file",