diff --git a/index.ts b/index.ts
index 8c301ca..6785b24 100644
--- a/index.ts
+++ b/index.ts
@@ -1,17 +1,22 @@
 import fs from "fs"
+import os from "os"
 import { MatrixBotClient } from "./matrix-client.js"
 import { SessionManager } from "./session-manager.js"
 import { loadConfig } from "./config-loader.js"
 import { log } from "./logger.js"
 
+const PLUGIN_DATA_DIR = fs.mkdtempSync(`${os.homedir()}/.opencode-matrix-plugin-`)
+const LOG_FILE = `${PLUGIN_DATA_DIR}/plugin.log`
+const SETUP_STARTED_LOG = `${PLUGIN_DATA_DIR}/setup-started.log`
+const SETUP_ERROR_LOG = `${PLUGIN_DATA_DIR}/setup-error.log`
+const LOCK_FILE = `${PLUGIN_DATA_DIR}/lock`
+
 log("Plugin module loaded")
 
 // =============================================================================
 // Global mutex — prevents double startup (server + client both load plugins)
 // =============================================================================
 
-const LOCK_FILE = "/tmp/opencode-matrix-plugin.lock"
-
 function tryAcquireLock(): boolean {
   try {
     // Check if an existing lock is stale (process no longer running)
@@ -63,7 +68,7 @@ async function runPlugin(ctx: any, options: any) {
 
   try {
     const directory = ctx?.location?.directory || process.cwd()
-    fs.appendFileSync("/tmp/opencode-matrix-plugin/setup-started.log", `[${new Date().toISOString()}] setup() called, dir=${directory}\n`)
+    fs.appendFileSync(SETUP_STARTED_LOG, `[${new Date().toISOString()}] setup() called, dir=${directory}\n`)
     log(`Plugin setup started, directory=${directory}`)
 
     if (!options.homeserver) {
@@ -265,7 +270,7 @@ async function runPlugin(ctx: any, options: any) {
 
     return cleanup
   } catch (err) {
-    fs.appendFileSync("/tmp/opencode-matrix-plugin/setup-error.log", `[${new Date().toISOString()}] ${String(err)}\n`)
+    fs.appendFileSync(SETUP_ERROR_LOG, `[${new Date().toISOString()}] ${String(err)}\n`)
     log(`Setup error: ${String(err)}`)
     releaseLock()
     return () => {}
@@ -281,7 +286,7 @@ async function v2Setup(ctx: any) {
     const { options } = await loadConfig(ctx.options)
     return await runPlugin(ctx, options)
   } catch (err) {
-    fs.appendFileSync("/tmp/opencode-matrix-plugin/setup-error.log", `[${new Date().toISOString()}] ${String(err)}\n`)
+    fs.appendFileSync(SETUP_ERROR_LOG, `[${new Date().toISOString()}] ${String(err)}\n`)
     log(`V2 setup error: ${String(err)}`)
     return () => {}
   }