diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6a8c79d2..cf1e01a2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
       - name: Check out code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Detect changed files
-        uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3
+        uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
         id: filter
         with:
           list-files: shell
@@ -37,9 +37,9 @@ jobs:
             all:
               - '**'
       - name: Set up Terraform
-        uses: coder/coder/.github/actions/setup-tf@deaacff8437e3f4ee84bc51c4e5162f6dd7d190e # v2.31.3
+        uses: coder/coder/.github/actions/setup-tf@1a774ab7ce99063a2e01beb94de3fcbccaf84dbe # v2.31.5
       - name: Set up Bun
-        uses: oven-sh/setup-bun@ecf28ddc73e819eb6fa29df6b34ef8921c743461 # v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
         with:
           # We're using the latest version of Bun for now, but it might be worth
           # reconsidering. They've pushed breaking changes in patch releases
@@ -82,12 +82,12 @@ jobs:
       - name: Check out code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install Bun
-        uses: oven-sh/setup-bun@ecf28ddc73e819eb6fa29df6b34ef8921c743461 # v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
         with:
           bun-version: latest
       # Need Terraform for its formatter
       - name: Install Terraform
-        uses: coder/coder/.github/actions/setup-tf@deaacff8437e3f4ee84bc51c4e5162f6dd7d190e # v2.31.3
+        uses: coder/coder/.github/actions/setup-tf@1a774ab7ce99063a2e01beb94de3fcbccaf84dbe # v2.31.5
       - name: Install dependencies
         run: bun install
       - name: Validate formatting
diff --git a/.github/workflows/version-bump.yaml b/.github/workflows/version-bump.yaml
index c5dbc1b8..8a8d4d40 100644
--- a/.github/workflows/version-bump.yaml
+++ b/.github/workflows/version-bump.yaml
@@ -26,12 +26,12 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Bun
-        uses: oven-sh/setup-bun@ecf28ddc73e819eb6fa29df6b34ef8921c743461 # v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
         with:
           bun-version: latest
 
       - name: Set up Terraform
-        uses: coder/coder/.github/actions/setup-tf@deaacff8437e3f4ee84bc51c4e5162f6dd7d190e # v2.31.3
+        uses: coder/coder/.github/actions/setup-tf@1a774ab7ce99063a2e01beb94de3fcbccaf84dbe # v2.31.5
 
       - name: Install dependencies
         run: bun install
diff --git a/registry/coder-labs/modules/codex/README.md b/registry/coder-labs/modules/codex/README.md
index 5e8ac272..16786d02 100644
--- a/registry/coder-labs/modules/codex/README.md
+++ b/registry/coder-labs/modules/codex/README.md
@@ -13,7 +13,7 @@ Run Codex CLI in your workspace to access OpenAI's models through the Codex inte
 ```tf
 module "codex" {
   source         = "registry.coder.com/coder-labs/codex/coder"
-  version        = "4.3.0"
+  version        = "4.3.1"
   agent_id       = coder_agent.example.id
   openai_api_key = var.openai_api_key
   workdir        = "/home/coder/project"
@@ -32,7 +32,7 @@ module "codex" {
 module "codex" {
   count          = data.coder_workspace.me.start_count
   source         = "registry.coder.com/coder-labs/codex/coder"
-  version        = "4.3.0"
+  version        = "4.3.1"
   agent_id       = coder_agent.example.id
   openai_api_key = "..."
   workdir        = "/home/coder/project"
@@ -51,7 +51,7 @@ For tasks integration with AI Bridge, add `enable_aibridge = true` to the [Usage
 ```tf
 module "codex" {
   source          = "registry.coder.com/coder-labs/codex/coder"
-  version         = "4.3.0"
+  version         = "4.3.1"
   agent_id        = coder_agent.example.id
   workdir         = "/home/coder/project"
   enable_aibridge = true
@@ -60,21 +60,16 @@ module "codex" {
 
 When `enable_aibridge = true`, the module:
 
-- Configures Codex to use the AI Bridge profile with `base_url` pointing to `${data.coder_workspace.me.access_url}/api/v2/aibridge/openai/v1` and `env_key` pointing to the workspace owner's session token
+- Configures Codex to use the aibridge model_provider with `base_url` pointing to `${data.coder_workspace.me.access_url}/api/v2/aibridge/openai/v1` and `env_key` pointing to the workspace owner's session token
 
 ```toml
-profile = "aibridge" # sets the default profile to aibridge
+model_provider = "aibridge"
 
 [model_providers.aibridge]
 name = "AI Bridge"
 base_url = "https://example.coder.com/api/v2/aibridge/openai/v1"
 env_key = "CODER_AIBRIDGE_SESSION_TOKEN"
 wire_api = "responses"
-
-[profiles.aibridge]
-model_provider = "aibridge"
-model = "<model>" # as configured in the module input
-model_reasoning_effort = "<model_reasoning_effort>" # as configured in the module input
 ```
 
 This allows Codex to route API requests through Coder's AI Bridge instead of directly to OpenAI's API.
@@ -94,7 +89,7 @@ data "coder_task" "me" {}
 
 module "codex" {
   source         = "registry.coder.com/coder-labs/codex/coder"
-  version        = "4.3.0"
+  version        = "4.3.1"
   agent_id       = coder_agent.example.id
   openai_api_key = "..."
   ai_prompt      = data.coder_task.me.prompt
@@ -114,7 +109,7 @@ By default, when `enable_boundary = true`, the module uses `coder boundary` subc
 ```tf
 module "codex" {
   source          = "registry.coder.com/coder-labs/codex/coder"
-  version         = "4.3.0"
+  version         = "4.3.1"
   agent_id        = coder_agent.main.id
   openai_api_key  = var.openai_api_key
   workdir         = "/home/coder/project"
@@ -132,7 +127,7 @@ This example shows additional configuration options for custom models, MCP serve
 ```tf
 module "codex" {
   source         = "registry.coder.com/coder-labs/codex/coder"
-  version        = "4.3.0"
+  version        = "4.3.1"
   agent_id       = coder_agent.example.id
   openai_api_key = "..."
   workdir        = "/home/coder/project"
diff --git a/registry/coder-labs/modules/codex/main.test.ts b/registry/coder-labs/modules/codex/main.test.ts
index 3eff3eca..13055867 100644
--- a/registry/coder-labs/modules/codex/main.test.ts
+++ b/registry/coder-labs/modules/codex/main.test.ts
@@ -468,10 +468,7 @@ describe("codex", async () => {
       id,
       "/home/coder/.codex/config.toml",
     );
-    expect(configToml).toContain(
-      "[profiles.aibridge]\n" + 'model_provider = "aibridge"',
-    );
-    expect(configToml).toContain('profile = "aibridge"');
+    expect(configToml).toContain('model_provider = "aibridge"');
   });
 
   test("boundary-enabled", async () => {
diff --git a/registry/coder-labs/modules/codex/main.tf b/registry/coder-labs/modules/codex/main.tf
index 4d9c5ae1..b5f71cb3 100644
--- a/registry/coder-labs/modules/codex/main.tf
+++ b/registry/coder-labs/modules/codex/main.tf
@@ -84,10 +84,10 @@ variable "enable_aibridge" {
 
 variable "model_reasoning_effort" {
   type        = string
-  description = "The reasoning effort for the AI Bridge model. One of: none, low, medium, high. https://platform.openai.com/docs/guides/latest-model#lower-reasoning-effort"
-  default     = "medium"
+  description = "The reasoning effort for the model. One of: none, low, medium, high. https://platform.openai.com/docs/guides/latest-model#lower-reasoning-effort"
+  default     = ""
   validation {
-    condition     = contains(["none", "low", "medium", "high"], var.model_reasoning_effort)
+    condition     = contains(["", "none", "minimal", "low", "medium", "high", "xhigh"], var.model_reasoning_effort)
     error_message = "model_reasoning_effort must be one of: none, low, medium, high."
   }
 }
@@ -137,7 +137,7 @@ variable "agentapi_version" {
 variable "codex_model" {
   type        = string
   description = "The model for Codex to use. Defaults to gpt-5.3-codex."
-  default     = "gpt-5.3-codex"
+  default     = "gpt-5.4"
 }
 
 variable "pre_install_script" {
@@ -225,7 +225,7 @@ locals {
   install_script     = file("${path.module}/scripts/install.sh")
   start_script       = file("${path.module}/scripts/start.sh")
   module_dir_name    = ".codex-module"
-  latest_codex_model = "gpt-5.3-codex"
+  latest_codex_model = "gpt-5.4"
   aibridge_config    = <<-EOF
   [model_providers.aibridge]
   name = "AI Bridge"
@@ -233,10 +233,6 @@ locals {
   env_key = "CODER_AIBRIDGE_SESSION_TOKEN"
   wire_api = "responses"
 
-  [profiles.aibridge]
-  model_provider = "aibridge"
-  model = "${var.codex_model}"
-  model_reasoning_effort = "${var.model_reasoning_effort}"
   EOF
 }
 
@@ -302,6 +298,7 @@ module "agentapi" {
     ARG_ADDITIONAL_MCP_SERVERS='${base64encode(var.additional_mcp_servers)}' \
     ARG_CODER_MCP_APP_STATUS_SLUG='${local.app_slug}' \
     ARG_CODEX_START_DIRECTORY='${local.workdir}' \
+    ARG_MODEL_REASONING_EFFORT='${var.model_reasoning_effort}' \
     ARG_CODEX_INSTRUCTION_PROMPT='${base64encode(var.codex_system_prompt)}' \
     /tmp/install.sh
   EOT
diff --git a/registry/coder-labs/modules/codex/scripts/install.sh b/registry/coder-labs/modules/codex/scripts/install.sh
index 4742c413..9a191a02 100644
--- a/registry/coder-labs/modules/codex/scripts/install.sh
+++ b/registry/coder-labs/modules/codex/scripts/install.sh
@@ -93,10 +93,14 @@ function install_codex() {
 write_minimal_default_config() {
   local config_path="$1"
 
-  ARG_DEFAULT_PROFILE=""
+  ARG_OPTIONAL_TOP_LEVEL_CONFIG=""
 
   if [[ "${ARG_ENABLE_AIBRIDGE}" = "true" ]]; then
-    ARG_DEFAULT_PROFILE='profile = "aibridge"'
+    ARG_OPTIONAL_TOP_LEVEL_CONFIG='model_provider = "aibridge"'
+  fi
+
+  if [[ "${ARG_MODEL_REASONING_EFFORT}" != "" ]]; then
+    ARG_OPTIONAL_TOP_LEVEL_CONFIG+=$'\n'"model_reasoning_effort = \"${ARG_MODEL_REASONING_EFFORT}\""
   fi
 
   cat << EOF > "$config_path"
@@ -104,13 +108,17 @@ write_minimal_default_config() {
 sandbox_mode = "workspace-write"
 approval_policy = "never"
 preferred_auth_method = "apikey"
-${ARG_DEFAULT_PROFILE}
+${ARG_OPTIONAL_TOP_LEVEL_CONFIG}
 
 [sandbox_workspace_write]
 network_access = true
 
 [notice.model_migrations]
 "${ARG_CODEX_MODEL}" = "${ARG_LATEST_CODEX_MODEL}"
+
+[projects."${ARG_CODEX_START_DIRECTORY}"]
+trust_level = "trusted"
+
 EOF
 }
 
diff --git a/registry/coder-labs/modules/codex/scripts/start.sh b/registry/coder-labs/modules/codex/scripts/start.sh
index 0dbf5a60..bac0cb45 100644
--- a/registry/coder-labs/modules/codex/scripts/start.sh
+++ b/registry/coder-labs/modules/codex/scripts/start.sh
@@ -155,7 +155,7 @@ setup_workdir() {
 build_codex_args() {
   CODEX_ARGS=()
 
-  if [[ -n "${ARG_CODEX_MODEL}" ]] && [[ "${ARG_ENABLE_AIBRIDGE}" != "true" ]]; then
+  if [[ -n "${ARG_CODEX_MODEL}" ]]; then
     CODEX_ARGS+=("--model" "${ARG_CODEX_MODEL}")
   fi
 
diff --git a/registry/coder/modules/claude-code/README.md b/registry/coder/modules/claude-code/README.md
index 3d875046..6c25c8cc 100644
--- a/registry/coder/modules/claude-code/README.md
+++ b/registry/coder/modules/claude-code/README.md
@@ -13,7 +13,7 @@ Run the [Claude Code](https://docs.anthropic.com/en/docs/agents-and-tools/claude
 ```tf
 module "claude-code" {
   source         = "registry.coder.com/coder/claude-code/coder"
-  version        = "4.8.0"
+  version        = "4.8.1"
   agent_id       = coder_agent.main.id
   workdir        = "/home/coder/project"
   claude_api_key = "xxxx-xxxxx-xxxx"
@@ -60,7 +60,7 @@ By default, when `enable_boundary = true`, the module uses `coder boundary` subc
 ```tf
 module "claude-code" {
   source          = "registry.coder.com/coder/claude-code/coder"
-  version         = "4.8.0"
+  version         = "4.8.1"
   agent_id        = coder_agent.main.id
   workdir         = "/home/coder/project"
   enable_boundary = true
@@ -81,7 +81,7 @@ For tasks integration with AI Bridge, add `enable_aibridge = true` to the [Usage
 ```tf
 module "claude-code" {
   source          = "registry.coder.com/coder/claude-code/coder"
-  version         = "4.8.0"
+  version         = "4.8.1"
   agent_id        = coder_agent.main.id
   workdir         = "/home/coder/project"
   enable_aibridge = true
@@ -110,7 +110,7 @@ data "coder_task" "me" {}
 
 module "claude-code" {
   source    = "registry.coder.com/coder/claude-code/coder"
-  version   = "4.8.0"
+  version   = "4.8.1"
   agent_id  = coder_agent.main.id
   workdir   = "/home/coder/project"
   ai_prompt = data.coder_task.me.prompt
@@ -133,7 +133,7 @@ This example shows additional configuration options for version pinning, custom
 ```tf
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.8.0"
+  version  = "4.8.1"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
 
@@ -189,7 +189,7 @@ Run and configure Claude Code as a standalone CLI in your workspace.
 ```tf
 module "claude-code" {
   source              = "registry.coder.com/coder/claude-code/coder"
-  version             = "4.8.0"
+  version             = "4.8.1"
   agent_id            = coder_agent.main.id
   workdir             = "/home/coder/project"
   install_claude_code = true
@@ -211,7 +211,7 @@ variable "claude_code_oauth_token" {
 
 module "claude-code" {
   source                  = "registry.coder.com/coder/claude-code/coder"
-  version                 = "4.8.0"
+  version                 = "4.8.1"
   agent_id                = coder_agent.main.id
   workdir                 = "/home/coder/project"
   claude_code_oauth_token = var.claude_code_oauth_token
@@ -284,7 +284,7 @@ resource "coder_env" "bedrock_api_key" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.8.0"
+  version  = "4.8.1"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
   model    = "global.anthropic.claude-sonnet-4-5-20250929-v1:0"
@@ -341,7 +341,7 @@ resource "coder_env" "google_application_credentials" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.8.0"
+  version  = "4.8.1"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
   model    = "claude-sonnet-4@20250514"
diff --git a/registry/coder/modules/claude-code/scripts/start.sh b/registry/coder/modules/claude-code/scripts/start.sh
index 2df8fce1..5ccbc8fa 100644
--- a/registry/coder/modules/claude-code/scripts/start.sh
+++ b/registry/coder/modules/claude-code/scripts/start.sh
@@ -88,7 +88,7 @@ TASK_SESSION_ID="cd32e253-ca16-4fd3-9825-d837e74ae3c2"
 
 get_project_dir() {
   local workdir_normalized
-  workdir_normalized=$(echo "$ARG_WORKDIR" | tr '/' '-')
+  workdir_normalized=$(echo "$ARG_WORKDIR" | tr '/._' '-')
   echo "$HOME/.claude/projects/${workdir_normalized}"
 }
 
diff --git a/registry/coder/modules/mux/README.md b/registry/coder/modules/mux/README.md
index 46bf295b..fb26d381 100644
--- a/registry/coder/modules/mux/README.md
+++ b/registry/coder/modules/mux/README.md
@@ -8,13 +8,13 @@ tags: [ai, agents, development, multiplexer]
 
 # Mux
 
-Automatically install and run [Mux](https://github.com/coder/mux) in a Coder workspace. By default, the module auto-detects an available package manager (`npm`, `pnpm`, or `bun`) to install `mux@next` (with a fallback to downloading the npm tarball if none is found). You can also force a specific package manager via `package_manager` and point to a custom registry with `registry_url`. The launcher now keeps watching the mux process after startup and appends signal/exit-code diagnostics to the mux log when the server is killed outside the Node runtime. Mux is a desktop application for parallel agentic development that enables developers to run multiple AI agents simultaneously across isolated workspaces.
+Automatically install and run [Mux](https://github.com/coder/mux) in a Coder workspace. By default, the module auto-detects an available package manager (`npm`, `pnpm`, or `bun`) to install `mux@next` (with a fallback to downloading the npm tarball if none is found). You can also force a specific package manager via `package_manager` and point to a custom registry with `registry_url`. The launcher keeps watching the mux process after startup, appends signal/exit-code diagnostics to the mux log when the server is killed outside the Node runtime, and can optionally wait a few seconds, remove the stale server lock, and restart Mux after any exit until an optional restart-attempt cap is reached. Mux is a desktop application for parallel agentic development that enables developers to run multiple AI agents simultaneously across isolated workspaces.
 
 ```tf
 module "mux" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/mux/coder"
-  version  = "1.4.0"
+  version  = "1.4.3"
   agent_id = coder_agent.main.id
 }
 ```
@@ -37,7 +37,7 @@ module "mux" {
 module "mux" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/mux/coder"
-  version  = "1.4.0"
+  version  = "1.4.3"
   agent_id = coder_agent.main.id
 }
 ```
@@ -48,7 +48,7 @@ module "mux" {
 module "mux" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/mux/coder"
-  version  = "1.4.0"
+  version  = "1.4.3"
   agent_id = coder_agent.main.id
   # Default is "latest"; set to a specific version to pin
   install_version = "0.4.0"
@@ -63,7 +63,7 @@ Start Mux with `mux server --add-project /path/to/project`:
 module "mux" {
   count       = data.coder_workspace.me.start_count
   source      = "registry.coder.com/coder/mux/coder"
-  version     = "1.4.0"
+  version     = "1.4.3"
   agent_id    = coder_agent.main.id
   add_project = "/path/to/project"
 }
@@ -78,19 +78,35 @@ The module parses quoted values, so grouped arguments remain intact.
 module "mux" {
   count                = data.coder_workspace.me.start_count
   source               = "registry.coder.com/coder/mux/coder"
-  version              = "1.4.0"
+  version              = "1.4.3"
   agent_id             = coder_agent.main.id
   additional_arguments = "--open-mode pinned --add-project '/workspaces/my repo'"
 }
 ```
 
+### Restart After Mux Exits
+
+Enable automatic restarts after Mux exits, including clean exits and intentional shutdown signals such as `SIGTERM`. The launcher waits for `restart_delay_seconds`, removes `~/.mux/server.lock`, and starts Mux again. Set `max_restart_attempts` to a whole number to stop retrying after a fixed number of restarts, or leave it at `0` for unlimited retries.
+
+```tf
+module "mux" {
+  count                 = data.coder_workspace.me.start_count
+  source                = "registry.coder.com/coder/mux/coder"
+  version               = "1.4.3"
+  agent_id              = coder_agent.main.id
+  restart_on_kill       = true
+  restart_delay_seconds = 3
+  max_restart_attempts  = 5
+}
+```
+
 ### Custom Port
 
 ```tf
 module "mux" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/mux/coder"
-  version  = "1.4.0"
+  version  = "1.4.3"
   agent_id = coder_agent.main.id
   port     = 8080
 }
@@ -104,7 +120,7 @@ Force a specific package manager instead of auto-detection:
 module "mux" {
   count           = data.coder_workspace.me.start_count
   source          = "registry.coder.com/coder/mux/coder"
-  version         = "1.4.0"
+  version         = "1.4.3"
   agent_id        = coder_agent.main.id
   package_manager = "pnpm" # or "npm", "bun"
 }
@@ -118,7 +134,7 @@ Use a private or mirrored npm registry:
 module "mux" {
   count        = data.coder_workspace.me.start_count
   source       = "registry.coder.com/coder/mux/coder"
-  version      = "1.4.0"
+  version      = "1.4.3"
   agent_id     = coder_agent.main.id
   registry_url = "https://npm.pkg.github.com"
 }
@@ -132,7 +148,7 @@ Run an existing copy of Mux if found, otherwise install from npm:
 module "mux" {
   count      = data.coder_workspace.me.start_count
   source     = "registry.coder.com/coder/mux/coder"
-  version    = "1.4.0"
+  version    = "1.4.3"
   agent_id   = coder_agent.main.id
   use_cached = true
 }
@@ -146,7 +162,7 @@ Run without installing from the network (requires Mux to be pre-installed):
 module "mux" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/mux/coder"
-  version  = "1.4.0"
+  version  = "1.4.3"
   agent_id = coder_agent.main.id
   install  = false
 }
@@ -164,3 +180,5 @@ module "mux" {
 - Installs `mux@next` from the npm registry by default; set `registry_url` to use a private or mirrored registry
 - Falls back to a direct tarball download when no package manager is found
 - Appends best-effort signal and external-kill diagnostics to `log_path` if the mux process dies after startup
+- Set `restart_on_kill = true` to wait `restart_delay_seconds`, remove `~/.mux/server.lock`, and restart Mux after it exits
+- Set `max_restart_attempts` to a whole-number cap on restart attempts, or leave it at `0` for unlimited retries
diff --git a/registry/coder/modules/mux/main.test.ts b/registry/coder/modules/mux/main.test.ts
index 9537e9de..a8944dee 100644
--- a/registry/coder/modules/mux/main.test.ts
+++ b/registry/coder/modules/mux/main.test.ts
@@ -145,6 +145,143 @@ chmod +x /tmp/mux/mux`,
     }
   }, 60000);
 
+  it("restarts after a clean exit when enabled", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      install: false,
+      log_path: "/tmp/mux.log",
+      restart_on_kill: true,
+      restart_delay_seconds: 1,
+      max_restart_attempts: 1,
+    });
+
+    const instance = findResourceInstance(state, "coder_script");
+    const id = await runContainer("alpine/curl");
+
+    try {
+      const setup = await execContainer(id, [
+        "sh",
+        "-c",
+        `apk add --no-cache bash >/dev/null
+mkdir -p /tmp/mux
+cat <<'EOF' > /tmp/mux/mux
+#!/usr/bin/env sh
+run_count_file="/tmp/mux-run-count"
+run_count=0
+if [ -f "$run_count_file" ]; then
+  run_count=$(cat "$run_count_file")
+fi
+run_count=$((run_count + 1))
+printf '%s' "$run_count" > "$run_count_file"
+echo "run=$run_count"
+if [ "$run_count" -eq 1 ]; then
+  mkdir -p "$HOME/.mux"
+  touch "$HOME/.mux/server.lock"
+  exit 0
+fi
+if [ -f "$HOME/.mux/server.lock" ]; then
+  echo "lock=present"
+else
+  echo "lock=cleaned"
+fi
+exit 0
+EOF
+chmod +x /tmp/mux/mux`,
+      ]);
+      expect(setup.exitCode).toBe(0);
+
+      const output = await execContainer(id, ["sh", "-c", instance.script]);
+      if (output.exitCode !== 0) {
+        console.log("STDOUT:\n" + output.stdout);
+        console.log("STDERR:\n" + output.stderr);
+      }
+      expect(output.exitCode).toBe(0);
+
+      await execContainer(id, ["sh", "-c", "sleep 4"]);
+      const log = await readFileContainer(id, "/tmp/mux.log");
+      const runCount = await readFileContainer(id, "/tmp/mux-run-count");
+      expect(log).toContain("run=1");
+      expect(log).toContain("mux server exited cleanly.");
+      expect(log).toContain(
+        "Waiting 1 seconds before restarting mux after it exited.",
+      );
+      expect(log).toContain(
+        "Removing /root/.mux/server.lock before restarting mux.",
+      );
+      expect(log).toContain("run=2");
+      expect(log).toContain("lock=cleaned");
+      expect(log).toContain(
+        "Reached the max restart attempts limit (1); not restarting mux again.",
+      );
+      expect(runCount.trim()).toBe("2");
+    } finally {
+      await removeContainer(id);
+    }
+  }, 60000);
+
+  it("restarts after SIGTERM when enabled", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      install: false,
+      log_path: "/tmp/mux.log",
+      restart_on_kill: true,
+      restart_delay_seconds: 1,
+      max_restart_attempts: 1,
+    });
+
+    const instance = findResourceInstance(state, "coder_script");
+    const id = await runContainer("alpine/curl");
+
+    try {
+      const setup = await execContainer(id, [
+        "sh",
+        "-c",
+        `apk add --no-cache bash >/dev/null
+mkdir -p /tmp/mux
+cat <<'EOF' > /tmp/mux/mux
+#!/usr/bin/env sh
+run_count_file="/tmp/mux-run-count"
+run_count=0
+if [ -f "$run_count_file" ]; then
+  run_count=$(cat "$run_count_file")
+fi
+run_count=$((run_count + 1))
+printf '%s' "$run_count" > "$run_count_file"
+echo "run=$run_count"
+if [ "$run_count" -eq 1 ]; then
+  kill -TERM $$
+fi
+exit 0
+EOF
+chmod +x /tmp/mux/mux`,
+      ]);
+      expect(setup.exitCode).toBe(0);
+
+      const output = await execContainer(id, ["sh", "-c", instance.script]);
+      if (output.exitCode !== 0) {
+        console.log("STDOUT:\n" + output.stdout);
+        console.log("STDERR:\n" + output.stderr);
+      }
+      expect(output.exitCode).toBe(0);
+
+      await execContainer(id, ["sh", "-c", "sleep 4"]);
+      const log = await readFileContainer(id, "/tmp/mux.log");
+      const runCount = await readFileContainer(id, "/tmp/mux-run-count");
+      expect(log).toContain("run=1");
+      expect(log).toContain("signal TERM (15); shell exit code 143.");
+      expect(log).toContain(
+        "Waiting 1 seconds before restarting mux after it exited.",
+      );
+      expect(log).toContain("run=2");
+      expect(log).toContain(
+        "Reached the max restart attempts limit (1); not restarting mux again.",
+      );
+      expect(runCount.trim()).toBe("2");
+    } finally {
+      await removeContainer(id);
+    }
+  }, 60000);
+
   it("runs with npm present", async () => {
     const state = await runTerraformApply(import.meta.dir, {
       agent_id: "foo",
diff --git a/registry/coder/modules/mux/main.tf b/registry/coder/modules/mux/main.tf
index ba475b0c..f80b8b3f 100644
--- a/registry/coder/modules/mux/main.tf
+++ b/registry/coder/modules/mux/main.tf
@@ -49,6 +49,34 @@ variable "log_path" {
   default     = "/tmp/mux.log"
 }
 
+variable "restart_on_kill" {
+  type        = bool
+  description = "Restart Mux after it exits by waiting briefly, removing the server lock, and launching it again."
+  default     = false
+}
+
+variable "restart_delay_seconds" {
+  type        = number
+  description = "How long to wait before restarting Mux after it exits when restart_on_kill is enabled."
+  default     = 5
+
+  validation {
+    condition     = var.restart_delay_seconds >= 0
+    error_message = "The 'restart_delay_seconds' variable must be greater than or equal to 0."
+  }
+}
+
+variable "max_restart_attempts" {
+  type        = number
+  description = "Maximum whole-number restart attempts before giving up. Set to 0 for unlimited restarts when restart_on_kill is enabled."
+  default     = 0
+
+  validation {
+    condition     = var.max_restart_attempts >= 0 && floor(var.max_restart_attempts) == var.max_restart_attempts
+    error_message = "The 'max_restart_attempts' variable must be a whole number greater than or equal to 0."
+  }
+}
+
 variable "add_project" {
   type        = string
   description = "Optional path to add/open as a project in Mux on startup."
@@ -171,6 +199,9 @@ resource "coder_script" "mux" {
     OFFLINE : !var.install,
     USE_CACHED : var.use_cached,
     AUTH_TOKEN : local.mux_auth_token,
+    RESTART_ON_KILL : var.restart_on_kill,
+    RESTART_DELAY_SECONDS : var.restart_delay_seconds,
+    MAX_RESTART_ATTEMPTS : var.max_restart_attempts,
     PACKAGE_MANAGER : var.package_manager,
     REGISTRY_URL : local.registry_url,
   })
diff --git a/registry/coder/modules/mux/mux.tftest.hcl b/registry/coder/modules/mux/mux.tftest.hcl
index e7816de8..af4cbfe2 100644
--- a/registry/coder/modules/mux/mux.tftest.hcl
+++ b/registry/coder/modules/mux/mux.tftest.hcl
@@ -111,6 +111,111 @@ run "launcher_logs_external_kills" {
   }
 }
 
+run "restart_on_kill_enabled" {
+  command = plan
+
+  variables {
+    agent_id              = "foo"
+    restart_on_kill       = true
+    restart_delay_seconds = 7
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "restart_on_kill_value=\"true\"")
+    error_message = "mux launcher must receive the restart_on_kill setting"
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "restart_delay_seconds_value=\"7\"")
+    error_message = "mux launcher must receive the configured restart delay"
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "Waiting $${RESTART_DELAY_SECONDS_VALUE} seconds before restarting mux after it exited.")
+    error_message = "mux launcher must log the restart delay before relaunching"
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "Removing $HOME/.mux/server.lock before restarting mux.")
+    error_message = "mux launcher must clean up the server lock before relaunching"
+  }
+
+  assert {
+    condition     = !strcontains(resource.coder_script.mux.script, "\"$exit_code\" -le 128")
+    error_message = "mux launcher must no longer exclude non-signal exits from restart handling"
+  }
+
+  assert {
+    condition     = !strcontains(resource.coder_script.mux.script, "1|2|15)")
+    error_message = "mux launcher must no longer exclude intentional signals from restart handling"
+  }
+}
+
+run "restart_on_kill_with_restart_cap" {
+  command = plan
+
+  variables {
+    agent_id              = "foo"
+    restart_on_kill       = true
+    restart_delay_seconds = 7
+    max_restart_attempts  = 2
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "max_restart_attempts_value=\"2\"")
+    error_message = "mux launcher must receive the configured restart cap"
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "Mux will stop restarting after $${max_restart_attempts_value} restart attempts.")
+    error_message = "mux launcher must describe the configured restart cap"
+  }
+
+  assert {
+    condition     = strcontains(resource.coder_script.mux.script, "Reached the max restart attempts limit ($MAX_RESTART_ATTEMPTS_VALUE); not restarting mux again.")
+    error_message = "mux launcher must log when it hits the restart cap"
+  }
+}
+
+run "invalid_max_restart_attempts" {
+  command = plan
+
+  variables {
+    agent_id             = "foo"
+    max_restart_attempts = -1
+  }
+
+  expect_failures = [
+    var.max_restart_attempts
+  ]
+}
+
+run "fractional_max_restart_attempts" {
+  command = plan
+
+  variables {
+    agent_id             = "foo"
+    max_restart_attempts = 0.5
+  }
+
+  expect_failures = [
+    var.max_restart_attempts
+  ]
+}
+
+run "invalid_restart_delay_seconds" {
+  command = plan
+
+  variables {
+    agent_id              = "foo"
+    restart_delay_seconds = -1
+  }
+
+  expect_failures = [
+    var.restart_delay_seconds
+  ]
+}
+
 run "custom_version" {
   command = plan
 
diff --git a/registry/coder/modules/mux/run.sh b/registry/coder/modules/mux/run.sh
index fb583480..bd2bb811 100644
--- a/registry/coder/modules/mux/run.sh
+++ b/registry/coder/modules/mux/run.sh
@@ -5,17 +5,30 @@ RESET='\033[0m'
 MUX_BINARY="${INSTALL_PREFIX}/mux"
 
 function run_mux() {
-  # Remove stale server lock if present
-  rm -f "$HOME/.mux/server.lock"
-
   local port_value
   local auth_token_value
+  local restart_on_kill_value
+  local restart_delay_seconds_value
+  local max_restart_attempts_value
+
   port_value="${PORT}"
   auth_token_value="${AUTH_TOKEN}"
+  restart_on_kill_value="${RESTART_ON_KILL}"
+  restart_delay_seconds_value="${RESTART_DELAY_SECONDS}"
+  max_restart_attempts_value="${MAX_RESTART_ATTEMPTS}"
+
   if [ -z "$port_value" ]; then
     port_value="4000"
   fi
 
+  if [ -z "$restart_delay_seconds_value" ]; then
+    restart_delay_seconds_value="5"
+  fi
+
+  if [ -z "$max_restart_attempts_value" ]; then
+    max_restart_attempts_value="0"
+  fi
+
   mkdir -p "$(dirname "${LOG_PATH}")"
 
   # Build args for mux (POSIX-compatible, avoid bash arrays)
@@ -41,13 +54,24 @@ EOF_ARGS
 
   echo "🚀 Starting mux server on port $port_value..."
   echo "Check logs at ${LOG_PATH}!"
-  echo "ℹ️ Unexpected exits will be appended to ${LOG_PATH} by the launcher."
+  echo "ℹ️ Mux exit details will be appended to ${LOG_PATH} by the launcher."
+  if [ "$restart_on_kill_value" = true ]; then
+    echo "ℹ️ Auto-restart after mux exits is enabled with a $${restart_delay_seconds_value}-second delay."
+    if [ "$max_restart_attempts_value" = "0" ]; then
+      echo "ℹ️ Automatic restarts are unlimited for every mux exit."
+    else
+      echo "ℹ️ Mux will stop restarting after $${max_restart_attempts_value} restart attempts."
+    fi
+  fi
 
   nohup env \
     LOG_PATH="${LOG_PATH}" \
     MUX_BINARY="$MUX_BINARY" \
     AUTH_TOKEN="$auth_token_value" \
     PORT_VALUE="$port_value" \
+    RESTART_ON_KILL_VALUE="$restart_on_kill_value" \
+    RESTART_DELAY_SECONDS_VALUE="$restart_delay_seconds_value" \
+    MAX_RESTART_ATTEMPTS_VALUE="$max_restart_attempts_value" \
     bash -s -- "$@" > /dev/null 2>&1 << 'EOF_LAUNCHER' &
 signal_name() {
   local signal_number="$1"
@@ -82,6 +106,14 @@ append_kernel_kill_context() {
   fi
 }
 
+cleanup_mux_lock() {
+  rm -f "$HOME/.mux/server.lock"
+}
+
+should_restart_mux() {
+  [ "$RESTART_ON_KILL_VALUE" = "true" ]
+}
+
 log_mux_exit() {
   local mux_pid="$1"
   local exit_code="$2"
@@ -114,11 +146,52 @@ log_mux_exit() {
   echo "[$timestamp] Check the earlier mux log lines for any in-process crash breadcrumbs from mux itself."
 }
 
-MUX_SERVER_AUTH_TOKEN="$AUTH_TOKEN" PORT="$PORT_VALUE" "$MUX_BINARY" "$@" >> "$LOG_PATH" 2>&1 &
-mux_pid=$!
-wait "$mux_pid"
-exit_code=$?
-log_mux_exit "$mux_pid" "$exit_code" >> "$LOG_PATH" 2>&1
+log_mux_restart_wait() {
+  local timestamp
+
+  timestamp="$(date -Iseconds 2> /dev/null || date)"
+  echo "[$timestamp] Waiting $${RESTART_DELAY_SECONDS_VALUE} seconds before restarting mux after it exited."
+}
+
+log_mux_restart_cleanup() {
+  local timestamp
+
+  timestamp="$(date -Iseconds 2> /dev/null || date)"
+  echo "[$timestamp] Removing $HOME/.mux/server.lock before restarting mux."
+}
+
+log_mux_restart_cap_reached() {
+  local timestamp
+
+  timestamp="$(date -Iseconds 2> /dev/null || date)"
+  echo "[$timestamp] Reached the max restart attempts limit ($MAX_RESTART_ATTEMPTS_VALUE); not restarting mux again."
+}
+
+restart_attempt_count=0
+while true; do
+  cleanup_mux_lock
+  MUX_SERVER_AUTH_TOKEN="$AUTH_TOKEN" PORT="$PORT_VALUE" "$MUX_BINARY" "$@" >> "$LOG_PATH" 2>&1 &
+  mux_pid=$!
+  wait "$mux_pid"
+  exit_code=$?
+  log_mux_exit "$mux_pid" "$exit_code" >> "$LOG_PATH" 2>&1
+
+  if should_restart_mux; then
+    if [ "$MAX_RESTART_ATTEMPTS_VALUE" -gt 0 ] && [ "$restart_attempt_count" -ge "$MAX_RESTART_ATTEMPTS_VALUE" ]; then
+      log_mux_restart_cap_reached >> "$LOG_PATH" 2>&1
+      break
+    fi
+
+    restart_attempt_count=$((restart_attempt_count + 1))
+    log_mux_restart_wait >> "$LOG_PATH" 2>&1
+    sleep "$RESTART_DELAY_SECONDS_VALUE"
+    cleanup_mux_lock
+    log_mux_restart_cleanup >> "$LOG_PATH" 2>&1
+    continue
+  fi
+
+  break
+done
 EOF_LAUNCHER
 }
 # Check if mux is already installed for offline mode
diff --git a/registry/coder/modules/portabledesktop/README.md b/registry/coder/modules/portabledesktop/README.md
new file mode 100644
index 00000000..a5afac77
--- /dev/null
+++ b/registry/coder/modules/portabledesktop/README.md
@@ -0,0 +1,46 @@
+---
+display_name: Portable Desktop
+description: Install the portabledesktop binary for lightweight Linux desktop sessions.
+icon: ../../../../.icons/desktop.svg
+verified: true
+tags: [desktop, vnc, ai]
+---
+
+# Portable Desktop
+
+Install [portabledesktop](https://github.com/coder/portabledesktop) for lightweight Linux desktop sessions over VNC. The binary is stored in the agent's script data directory and is automatically available on PATH via `CODER_SCRIPT_BIN_DIR`.
+
+```tf
+module "portabledesktop" {
+  source   = "registry.coder.com/coder/portabledesktop/coder"
+  version  = "0.1.0"
+  agent_id = coder_agent.example.id
+}
+```
+
+## Examples
+
+### Custom download URL with checksum verification
+
+```tf
+module "portabledesktop" {
+  source   = "registry.coder.com/coder/portabledesktop/coder"
+  version  = "0.1.0"
+  agent_id = coder_agent.example.id
+  url      = "https://example.com/portabledesktop-linux-x64"
+  sha256   = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+}
+```
+
+### Additionally copy to a system path
+
+Use `install_dir` to copy the binary to a system-wide directory in addition to the default script data directory:
+
+```tf
+module "portabledesktop" {
+  source      = "registry.coder.com/coder/portabledesktop/coder"
+  version     = "0.1.0"
+  agent_id    = coder_agent.example.id
+  install_dir = "/usr/local/bin"
+}
+```
diff --git a/registry/coder/modules/portabledesktop/main.test.ts b/registry/coder/modules/portabledesktop/main.test.ts
new file mode 100644
index 00000000..dd73f4e7
--- /dev/null
+++ b/registry/coder/modules/portabledesktop/main.test.ts
@@ -0,0 +1,242 @@
+import { describe, expect, it } from "bun:test";
+import {
+  execContainer,
+  findResourceInstance,
+  removeContainer,
+  runContainer,
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+  type TerraformState,
+} from "~test";
+
+interface TestFixture {
+  state: TerraformState;
+  server: ReturnType<typeof Bun.serve>;
+  [Symbol.asyncDispose](): Promise<void>;
+}
+
+interface ContainerHandle {
+  id: string;
+  [Symbol.asyncDispose](): Promise<void>;
+}
+
+async function setupContainer(image: string): Promise<ContainerHandle> {
+  const id = await runContainer(image);
+  return {
+    id,
+    [Symbol.asyncDispose]: async () => {
+      await removeContainer(id);
+    },
+  };
+}
+
+const ENV_PREFIX =
+  'export CODER_SCRIPT_DATA_DIR=/tmp/coder-script-data && export CODER_SCRIPT_BIN_DIR=/tmp/coder-script-data/bin && mkdir -p "$CODER_SCRIPT_DATA_DIR" "$CODER_SCRIPT_BIN_DIR" && ';
+
+async function setupFakeBinaryServer(
+  dir: string,
+  extraVars?: Record<string, string>,
+): Promise<TestFixture> {
+  const fakeBinary = "#!/bin/sh\necho portabledesktop";
+  const server = Bun.serve({
+    port: 0,
+    fetch() {
+      return new Response(fakeBinary);
+    },
+  });
+
+  const state = await runTerraformApply(dir, {
+    agent_id: "foo",
+    url: `http://localhost:${server.port}/portabledesktop`,
+    ...extraVars,
+  });
+
+  return {
+    state,
+    server,
+    [Symbol.asyncDispose]: async () => {
+      server.stop(true);
+    },
+  };
+}
+
+describe("portabledesktop", async () => {
+  await runTerraformInit(import.meta.dir);
+
+  testRequiredVariables(import.meta.dir, {
+    agent_id: "foo",
+  });
+
+  it("installs portabledesktop successfully", async () => {
+    await using fixture = await setupFakeBinaryServer(import.meta.dir);
+    await using container = await setupContainer("alpine/curl");
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+
+    // Check binary exists at CODER_SCRIPT_DATA_DIR.
+    const checkBinary = await execContainer(container.id, [
+      "test",
+      "-x",
+      "/tmp/coder-script-data/portabledesktop",
+    ]);
+    expect(checkBinary.exitCode).toBe(0);
+
+    // Check symlink exists at CODER_SCRIPT_BIN_DIR.
+    const checkSymlink = await execContainer(container.id, [
+      "test",
+      "-L",
+      "/tmp/coder-script-data/bin/portabledesktop",
+    ]);
+    expect(checkSymlink.exitCode).toBe(0);
+  }, 30000);
+
+  it("verifies checksum when sha256 is provided", async () => {
+    const fakeBinary = "#!/bin/sh\necho portabledesktop";
+    const hasher = new Bun.CryptoHasher("sha256");
+    hasher.update(fakeBinary);
+    const sha256 = hasher.digest("hex");
+
+    await using fixture = await setupFakeBinaryServer(import.meta.dir, {
+      sha256,
+    });
+    await using container = await setupContainer("alpine/curl");
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).toContain("Checksum verified successfully");
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+  }, 30000);
+
+  it("fails when sha256 does not match", async () => {
+    const wrongSha256 =
+      "0000000000000000000000000000000000000000000000000000000000000000";
+
+    await using fixture = await setupFakeBinaryServer(import.meta.dir, {
+      sha256: wrongSha256,
+    });
+    await using container = await setupContainer("alpine/curl");
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(1);
+    expect(resp.stdout).toContain("Checksum mismatch");
+  }, 30000);
+
+  it("skips checksum verification when sha256 is not set", async () => {
+    await using fixture = await setupFakeBinaryServer(import.meta.dir);
+    await using container = await setupContainer("alpine/curl");
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).not.toContain("Checksum verified");
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+  }, 30000);
+
+  it("falls back to sudo when install_dir is not writable", async () => {
+    await using fixture = await setupFakeBinaryServer(import.meta.dir, {
+      install_dir: "/usr/local/bin",
+    });
+    await using container = await setupContainer("alpine/curl");
+
+    await execContainer(container.id, [
+      "sh",
+      "-c",
+      "apk add sudo && " +
+        "adduser -D testuser && " +
+        "echo 'testuser ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers && " +
+        "mkdir -p /usr/local/bin",
+    ]);
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(
+      container.id,
+      ["sh", "-c", ENV_PREFIX + script],
+      ["--user", "testuser"],
+    );
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).toContain("via sudo");
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+
+    // Verify the binary was copied to the install_dir.
+    const check = await execContainer(container.id, [
+      "test",
+      "-x",
+      "/usr/local/bin/portabledesktop",
+    ]);
+    expect(check.exitCode).toBe(0);
+  }, 30000);
+
+  it("creates install_dir if it does not exist", async () => {
+    await using fixture = await setupFakeBinaryServer(import.meta.dir, {
+      install_dir: "/opt/custom/bin",
+    });
+    await using container = await setupContainer("alpine/curl");
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+
+    const check = await execContainer(container.id, [
+      "test",
+      "-x",
+      "/opt/custom/bin/portabledesktop",
+    ]);
+    expect(check.exitCode).toBe(0);
+  }, 30000);
+
+  it("falls back to wget when curl is not available", async () => {
+    await using fixture = await setupFakeBinaryServer(import.meta.dir);
+    await using container = await setupContainer("alpine");
+
+    // Install wget but ensure curl is not present.
+    await execContainer(container.id, [
+      "sh",
+      "-c",
+      "apk add wget && ! command -v curl",
+    ]);
+
+    const script = findResourceInstance(fixture.state, "coder_script").script;
+    const resp = await execContainer(container.id, [
+      "sh",
+      "-c",
+      ENV_PREFIX + script,
+    ]);
+
+    expect(resp.exitCode).toBe(0);
+    expect(resp.stdout).toContain("via wget");
+    expect(resp.stdout).toContain("portabledesktop installed successfully");
+  }, 30000);
+});
diff --git a/registry/coder/modules/portabledesktop/main.tf b/registry/coder/modules/portabledesktop/main.tf
new file mode 100644
index 00000000..68303c17
--- /dev/null
+++ b/registry/coder/modules/portabledesktop/main.tf
@@ -0,0 +1,65 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 2.5"
+    }
+  }
+}
+
+variable "agent_id" {
+  type        = string
+  description = "The ID of a Coder agent."
+}
+
+variable "install_dir" {
+  type        = string
+  description = "Optional directory to copy the binary into (e.g. /usr/local/bin). The binary is always stored in the agent's script data directory and available on PATH via CODER_SCRIPT_BIN_DIR."
+  default     = null
+}
+
+variable "url" {
+  type        = string
+  description = "Custom download URL. Overrides the default GitHub latest release URL when set."
+  default     = null
+}
+
+variable "sha256" {
+  type        = string
+  description = "SHA256 checksum. When set, the downloaded binary is verified against it."
+  default     = null
+}
+
+locals {
+  default_amd64_url = "https://github.com/coder/portabledesktop/releases/latest/download/portabledesktop-linux-x64"
+  default_arm64_url = "https://github.com/coder/portabledesktop/releases/latest/download/portabledesktop-linux-arm64"
+
+  using_custom_url = var.url != null
+
+  amd64_url = local.using_custom_url ? var.url : local.default_amd64_url
+  arm64_url = local.using_custom_url ? var.url : local.default_arm64_url
+
+  # Empty string signals "skip verification" to the shell script.
+  sha256      = var.sha256 != null ? var.sha256 : ""
+  install_dir = var.install_dir != null ? var.install_dir : ""
+}
+
+resource "coder_script" "portabledesktop" {
+  agent_id     = var.agent_id
+  display_name = "Portable Desktop"
+  icon         = "/icon/desktop.svg"
+  script       = <<-EOT
+    #!/bin/sh
+    set -eu
+    echo -n '${base64encode(file("${path.module}/run.sh"))}' | base64 -d > /tmp/portabledesktop-install.sh
+    chmod +x /tmp/portabledesktop-install.sh
+    ARG_AMD64_URL="$(echo -n '${base64encode(local.amd64_url)}' | base64 -d)" \
+    ARG_ARM64_URL="$(echo -n '${base64encode(local.arm64_url)}' | base64 -d)" \
+    ARG_SHA256="$(echo -n '${base64encode(local.sha256)}' | base64 -d)" \
+    ARG_INSTALL_DIR="$(echo -n '${base64encode(local.install_dir)}' | base64 -d)" \
+    /tmp/portabledesktop-install.sh
+    EOT
+  run_on_start = true
+}
diff --git a/registry/coder/modules/portabledesktop/portabledesktop.tftest.hcl b/registry/coder/modules/portabledesktop/portabledesktop.tftest.hcl
new file mode 100644
index 00000000..20a23170
--- /dev/null
+++ b/registry/coder/modules/portabledesktop/portabledesktop.tftest.hcl
@@ -0,0 +1,36 @@
+run "plan_with_required_vars" {
+  command = plan
+
+  variables {
+    agent_id = "example-agent-id"
+  }
+}
+
+run "plan_with_custom_install_dir" {
+  command = plan
+
+  variables {
+    agent_id    = "example-agent-id"
+    install_dir = "/opt/bin"
+  }
+
+  assert {
+    condition     = resource.coder_script.portabledesktop.display_name == "Portable Desktop"
+    error_message = "Expected coder_script resource to have correct display name"
+  }
+}
+
+run "plan_with_custom_url" {
+  command = plan
+
+  variables {
+    agent_id = "example-agent-id"
+    url      = "https://example.com/custom-portabledesktop"
+    sha256   = "abc123"
+  }
+
+  assert {
+    condition     = resource.coder_script.portabledesktop.run_on_start == true
+    error_message = "Expected coder_script to run on start"
+  }
+}
diff --git a/registry/coder/modules/portabledesktop/run.sh b/registry/coder/modules/portabledesktop/run.sh
new file mode 100644
index 00000000..f7e62eff
--- /dev/null
+++ b/registry/coder/modules/portabledesktop/run.sh
@@ -0,0 +1,132 @@
+#!/usr/bin/env sh
+# shellcheck disable=SC2292
+# SC2292: We use [ ] instead of [[ ]] for POSIX sh compatibility.
+set -eu
+
+error() {
+  printf "ERROR: %s\n" "$@"
+  exit 1
+}
+
+# Check if portabledesktop is already in PATH.
+if command -v portabledesktop > /dev/null 2>&1; then
+  printf "portabledesktop is already installed and in PATH.\n"
+  exit 0
+fi
+
+# Determine the storage path.
+STORAGE_DIR="${CODER_SCRIPT_DATA_DIR}"
+BINARY_PATH="${STORAGE_DIR}/portabledesktop"
+mkdir -p "${STORAGE_DIR}"
+
+# If the binary already exists and is executable, skip download.
+if [ -x "${BINARY_PATH}" ]; then
+  printf "portabledesktop is already installed at %s, skipping download.\n" "${BINARY_PATH}"
+else
+  # Detect architecture and select the appropriate download URL.
+  ARCH=$(uname -m)
+  case "${ARCH}" in
+    x86_64)
+      URL="${ARG_AMD64_URL}"
+      ;;
+    aarch64)
+      URL="${ARG_ARM64_URL}"
+      ;;
+    *)
+      error "Unsupported architecture: ${ARCH}"
+      ;;
+  esac
+
+  # Select download tool.
+  if command -v curl > /dev/null 2>&1; then
+    DOWNLOAD_CMD="curl"
+  elif command -v wget > /dev/null 2>&1; then
+    DOWNLOAD_CMD="wget"
+  else
+    error "No download tool available (curl or wget required)."
+  fi
+
+  # Download with retry loop (3 attempts, 1s sleep between).
+  TMPFILE=$(mktemp)
+  MAX_ATTEMPTS=3
+  DOWNLOAD_SUCCESS=false
+  ATTEMPT=1
+
+  while [ "${ATTEMPT}" -le "${MAX_ATTEMPTS}" ]; do
+    printf "Downloading portabledesktop (attempt %s/%s) via %s...\n" "${ATTEMPT}" "${MAX_ATTEMPTS}" "${DOWNLOAD_CMD}"
+
+    DOWNLOAD_OK=false
+    if [ "${DOWNLOAD_CMD}" = "curl" ]; then
+      curl -fsSL "${URL}" -o "${TMPFILE}" && DOWNLOAD_OK=true
+    else
+      wget -qO "${TMPFILE}" "${URL}" && DOWNLOAD_OK=true
+    fi
+
+    if [ "${DOWNLOAD_OK}" = "true" ]; then
+      # Verify checksum when ARG_SHA256 is non-empty.
+      if [ -n "${ARG_SHA256}" ]; then
+        CHECKSUM_MATCH=false
+        if command -v sha256sum > /dev/null 2>&1; then
+          echo "${ARG_SHA256}  ${TMPFILE}" | sha256sum -c - > /dev/null 2>&1 && CHECKSUM_MATCH=true
+        elif command -v shasum > /dev/null 2>&1; then
+          echo "${ARG_SHA256}  ${TMPFILE}" | shasum -a 256 -c - > /dev/null 2>&1 && CHECKSUM_MATCH=true
+        else
+          rm -f "${TMPFILE}"
+          error "No SHA256 tool available (sha256sum or shasum required)."
+        fi
+
+        if [ "${CHECKSUM_MATCH}" != "true" ]; then
+          printf "WARNING: Checksum mismatch (attempt %s/%s): expected %s\n" \
+            "${ATTEMPT}" "${MAX_ATTEMPTS}" "${ARG_SHA256}"
+          rm -f "${TMPFILE}"
+          if [ "${ATTEMPT}" -lt "${MAX_ATTEMPTS}" ]; then
+            sleep 1
+          fi
+          ATTEMPT=$((ATTEMPT + 1))
+          continue
+        fi
+        printf "Checksum verified successfully.\n"
+      fi
+
+      DOWNLOAD_SUCCESS=true
+      break
+    else
+      printf "WARNING: Download failed (attempt %s/%s).\n" "${ATTEMPT}" "${MAX_ATTEMPTS}"
+      if [ "${ATTEMPT}" -lt "${MAX_ATTEMPTS}" ]; then
+        sleep 1
+      fi
+    fi
+
+    ATTEMPT=$((ATTEMPT + 1))
+  done
+
+  if [ "${DOWNLOAD_SUCCESS}" != "true" ]; then
+    rm -f "${TMPFILE}"
+    error "Failed to download portabledesktop after ${MAX_ATTEMPTS} attempts."
+  fi
+
+  # Make the binary executable and move to storage path.
+  chmod 755 "${TMPFILE}"
+  mv "${TMPFILE}" "${BINARY_PATH}"
+fi
+
+# Symlink into CODER_SCRIPT_BIN_DIR for PATH access.
+if [ -n "${CODER_SCRIPT_BIN_DIR}" ] && [ ! -e "${CODER_SCRIPT_BIN_DIR}/portabledesktop" ]; then
+  ln -s "${CODER_SCRIPT_DATA_DIR}/portabledesktop" "${CODER_SCRIPT_BIN_DIR}/portabledesktop"
+fi
+
+# If ARG_INSTALL_DIR is set, copy the binary there with sudo fallback.
+if [ -n "${ARG_INSTALL_DIR}" ]; then
+  if [ ! -d "${ARG_INSTALL_DIR}" ]; then
+    mkdir -p "${ARG_INSTALL_DIR}" 2> /dev/null || sudo mkdir -p "${ARG_INSTALL_DIR}" 2> /dev/null || true
+  fi
+  if cp "${CODER_SCRIPT_DATA_DIR}/portabledesktop" "${ARG_INSTALL_DIR}/portabledesktop" 2> /dev/null; then
+    printf "Copied portabledesktop to %s.\n" "${ARG_INSTALL_DIR}/portabledesktop"
+  elif sudo cp "${CODER_SCRIPT_DATA_DIR}/portabledesktop" "${ARG_INSTALL_DIR}/portabledesktop" 2> /dev/null; then
+    printf "Copied portabledesktop to %s (via sudo).\n" "${ARG_INSTALL_DIR}/portabledesktop"
+  else
+    error "Failed to copy portabledesktop to ${ARG_INSTALL_DIR}/portabledesktop."
+  fi
+fi
+
+printf "portabledesktop installed successfully.\n"