refactor(registry/coder/modules/claude-code): render install script via templatefile

Render scripts/install.sh.tftpl once at plan time and pass the result
directly to coder-utils, replacing the runtime base64 encode/decode
wrapper and the redundant scripts/install.sh.

Sources coder-utils from a pinned commit on its refactor branch until
the `module_directory`-derived caller name lands in a tagged release.

Author: matifali

registry/coder/modules/claude-code/main.test.ts

@@ -300,7 +300,7 @@ describe("claude-code", async () => {
       },
     });
     await runScripts(id, scripts);
-    // install.sh echoes ARG_WORKDIR and creates the directory if missing.
+    // install.sh.tftpl echoes ARG_WORKDIR and creates the directory if missing.
     const installLog = await readFileContainer(
       id,
       "/home/coder/.coder-modules/coder/claude-code/logs/install.log",

registry/coder/modules/claude-code/main.tf

@@ -73,7 +73,7 @@ variable "model" {
 
 variable "mcp" {
   type        = string
-  description = "MCP JSON to be added to the claude code local scope"
+  description = "JSON-encoded string to configure MCP servers for Claude Code. When set, writes MCP configuration into the Claude Code local scope."
   default     = ""
 }
 
@@ -163,38 +163,30 @@ resource "coder_env" "anthropic_base_url" {
 }
 
 locals {
-  workdir         = trimsuffix(var.workdir, "/")
-  install_script  = file("${path.module}/scripts/install.sh")
+  workdir = trimsuffix(var.workdir, "/")
+  install_script = templatefile("${path.module}/scripts/install.sh.tftpl", {
+    ARG_CLAUDE_CODE_VERSION    = var.claude_code_version
+    ARG_INSTALL_CLAUDE_CODE    = tostring(var.install_claude_code)
+    ARG_CLAUDE_BINARY_PATH     = var.claude_binary_path
+    ARG_WORKDIR                = local.workdir
+    ARG_MCP                    = var.mcp != "" ? base64encode(var.mcp) : ""
+    ARG_MCP_CONFIG_REMOTE_PATH = base64encode(jsonencode(var.mcp_config_remote_path))
+    ARG_ENABLE_AI_GATEWAY      = tostring(var.enable_ai_gateway)
+  })
   module_dir_name = ".coder-modules/coder/claude-code"
 }
 
 module "coder_utils" {
   source  = "registry.coder.com/coder/coder-utils/coder"
-  version = "1.3.0"
+  version = "0.0.1"
 
   agent_id            = var.agent_id
-  agent_name          = "claude-code"
   module_directory    = "$HOME/${local.module_dir_name}"
   display_name_prefix = "Claude Code"
   icon                = var.icon
   pre_install_script  = var.pre_install_script
   post_install_script = var.post_install_script
-  install_script      = <<-EOT
-    #!/bin/bash
-    set -o errexit
-    set -o pipefail
-
-    echo -n '${base64encode(local.install_script)}' | base64 -d > /tmp/install.sh
-    chmod +x /tmp/install.sh
-    ARG_CLAUDE_CODE_VERSION='${var.claude_code_version}' \
-    ARG_INSTALL_CLAUDE_CODE='${var.install_claude_code}' \
-    ARG_CLAUDE_BINARY_PATH='${var.claude_binary_path}' \
-    ARG_WORKDIR='${local.workdir}' \
-    ARG_MCP='${var.mcp != null ? base64encode(replace(var.mcp, "'", "'\\''")) : ""}' \
-    ARG_MCP_CONFIG_REMOTE_PATH='${base64encode(jsonencode(var.mcp_config_remote_path))}' \
-    ARG_ENABLE_AI_GATEWAY='${var.enable_ai_gateway}' \
-    /tmp/install.sh
-  EOT
+  install_script      = local.install_script
 }
 
 # Pass-through of coder-utils script outputs so upstream modules can serialize

registry/coder/modules/claude-code/main.tftest.hcl

@@ -250,7 +250,7 @@ run "test_script_outputs_install_only" {
   }
 
   assert {
-    condition     = length(output.scripts) == 1 && output.scripts[0] == "claude-code-install_script"
+    condition     = length(output.scripts) == 1 && output.scripts[0] == "coder-claude-code-install_script"
     error_message = "scripts output should list only the install script when pre/post are not configured"
   }
 }
@@ -266,7 +266,7 @@ run "test_script_outputs_with_pre_and_post" {
   }
 
   assert {
-    condition     = output.scripts == ["claude-code-pre_install_script", "claude-code-install_script", "claude-code-post_install_script"]
+    condition     = output.scripts == ["coder-claude-code-pre_install_script", "coder-claude-code-install_script", "coder-claude-code-post_install_script"]
     error_message = "scripts output should list pre_install, install, post_install in run order"
   }
 }