Don't create CLAUDE_API_KEY coder_env if not set (#686)

## Description

At the moment, the `CLAUDE_API_KEY` coder_env will always be created,
even if the variable itself is not. This can lead to the environment
variable being unset if it has been set outside of Terraform.

With this PR, we make the `claude_api_key` coder_env conditional, so it
will only be created if an API key has been set.

## Type of Change

- [ ] New module
- [ ] New template
- [x] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder/modules/claude-code/main.tf`  
**New version:** `v4.7.4`  
**Breaking change:** [ ] Yes [x] No

## Testing & Validation

- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun fmt`)
- [x] Changes tested locally

## Related Issues

None

---------

Co-authored-by: 35C4n0r <70096901+35C4n0r@users.noreply.github.com>

Author: AndreasSko

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        = "4.7.3"
+  version        = "4.7.4"
   agent_id       = coder_agent.main.id
   workdir        = "/home/coder/project"
   claude_api_key = "xxxx-xxxxx-xxxx"
@@ -47,7 +47,7 @@ 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         = "4.7.3"
+  version         = "4.7.4"
   agent_id        = coder_agent.main.id
   workdir         = "/home/coder/project"
   enable_boundary = true
@@ -68,7 +68,7 @@ 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         = "4.7.3"
+  version         = "4.7.4"
   agent_id        = coder_agent.main.id
   workdir         = "/home/coder/project"
   enable_aibridge = true
@@ -97,7 +97,7 @@ data "coder_task" "me" {}
 
 module "claude-code" {
   source    = "registry.coder.com/coder/claude-code/coder"
-  version   = "4.7.3"
+  version   = "4.7.4"
   agent_id  = coder_agent.main.id
   workdir   = "/home/coder/project"
   ai_prompt = data.coder_task.me.prompt
@@ -120,7 +120,7 @@ This example shows additional configuration options for version pinning, custom
 ```tf
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.7.3"
+  version  = "4.7.4"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
 
@@ -176,7 +176,7 @@ 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             = "4.7.3"
+  version             = "4.7.4"
   agent_id            = coder_agent.main.id
   workdir             = "/home/coder/project"
   install_claude_code = true
@@ -198,7 +198,7 @@ variable "claude_code_oauth_token" {
 
 module "claude-code" {
   source                  = "registry.coder.com/coder/claude-code/coder"
-  version                 = "4.7.3"
+  version                 = "4.7.4"
   agent_id                = coder_agent.main.id
   workdir                 = "/home/coder/project"
   claude_code_oauth_token = var.claude_code_oauth_token
@@ -271,7 +271,7 @@ resource "coder_env" "bedrock_api_key" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.7.3"
+  version  = "4.7.4"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
   model    = "global.anthropic.claude-sonnet-4-5-20250929-v1:0"
@@ -328,7 +328,7 @@ resource "coder_env" "google_application_credentials" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.7.3"
+  version  = "4.7.4"
   agent_id = coder_agent.main.id
   workdir  = "/home/coder/project"
   model    = "claude-sonnet-4@20250514"

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

@@ -276,9 +276,11 @@ resource "coder_env" "claude_code_oauth_token" {
 }
 
 resource "coder_env" "claude_api_key" {
+  count = local.claude_api_key != "" ? 1 : 0
+
   agent_id = var.agent_id
   name     = "CLAUDE_API_KEY"
-  value    = var.enable_aibridge ? data.coder_workspace_owner.me.session_token : var.claude_api_key
+  value    = local.claude_api_key
 }
 
 resource "coder_env" "disable_autoupdater" {
@@ -324,7 +326,8 @@ locals {
   start_script    = file("${path.module}/scripts/start.sh")
   module_dir_name = ".claude-module"
   # Extract hostname from access_url for boundary --allow flag
-  coder_host = replace(replace(data.coder_workspace.me.access_url, "https://", ""), "http://", "")
+  coder_host     = replace(replace(data.coder_workspace.me.access_url, "https://", ""), "http://", "")
+  claude_api_key = var.enable_aibridge ? data.coder_workspace_owner.me.session_token : var.claude_api_key
 
   # Required prompts for the module to properly report task status to Coder
   report_tasks_system_prompt = <<-EOT

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

@@ -42,7 +42,7 @@ run "test_claude_code_with_api_key" {
   }
 
   assert {
-    condition     = coder_env.claude_api_key.value == "test-api-key-123"
+    condition     = coder_env.claude_api_key[0].value == "test-api-key-123"
     error_message = "Claude API key value should match the input"
   }
 }
@@ -298,6 +298,13 @@ run "test_aibridge_enabled" {
     enable_aibridge = true
   }
 
+  override_data {
+    target = data.coder_workspace_owner.me
+    values = {
+      session_token = "mock-session-token"
+    }
+  }
+
   assert {
     condition     = var.enable_aibridge == true
     error_message = "AI Bridge should be enabled"
@@ -314,12 +321,12 @@ run "test_aibridge_enabled" {
   }
 
   assert {
-    condition     = coder_env.claude_api_key.name == "CLAUDE_API_KEY"
+    condition     = coder_env.claude_api_key[0].name == "CLAUDE_API_KEY"
     error_message = "CLAUDE_API_KEY environment variable should be set"
   }
 
   assert {
-    condition     = coder_env.claude_api_key.value == data.coder_workspace_owner.me.session_token
+    condition     = coder_env.claude_api_key[0].value == data.coder_workspace_owner.me.session_token
     error_message = "CLAUDE_API_KEY should use workspace owner's session token when aibridge is enabled"
   }
 }
@@ -370,7 +377,7 @@ run "test_aibridge_disabled_with_api_key" {
   }
 
   assert {
-    condition     = coder_env.claude_api_key.value == "test-api-key-xyz"
+    condition     = coder_env.claude_api_key[0].value == "test-api-key-xyz"
     error_message = "CLAUDE_API_KEY should use the provided API key when aibridge is disabled"
   }
 
@@ -379,3 +386,18 @@ run "test_aibridge_disabled_with_api_key" {
     error_message = "ANTHROPIC_BASE_URL should not be set when aibridge is disabled"
   }
 }
+
+run "test_no_api_key_no_env" {
+  command = plan
+
+  variables {
+    agent_id        = "test-agent-no-key"
+    workdir         = "/home/coder/test"
+    enable_aibridge = false
+  }
+
+  assert {
+    condition     = length(coder_env.claude_api_key) == 0
+    error_message = "CLAUDE_API_KEY should not be created when no API key is provided and aibridge is disabled"
+  }
+}