fix(claude-code): change mcp add command to use mcp add-json instead (#564)

## Description

changes the `claude-code mcp add` command to `claude-code mcp add-json`
instead, and updates usage examples with real world mcp server example.

<!-- Briefly describe what this PR does and why -->

## 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`  
**New version:** `v4.2.2`  
**Breaking change:** [ ] Yes [X] No

## Testing & Validation

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

## Related Issues
#562 
<!-- Link related issues or write "None" if not applicable -->

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        = "4.2.1"
+  version        = "4.2.2"
   agent_id       = coder_agent.example.id
   workdir        = "/home/coder/project"
   claude_api_key = "xxxx-xxxxx-xxxx"
@@ -51,7 +51,7 @@ module "claude-code" {
   boundary_log_level               = "WARN"
   boundary_additional_allowed_urls = ["GET *google.com"]
   boundary_proxy_port              = "8087"
-  version                          = "4.2.1"
+  version                          = "4.2.2"
 }
 ```
 
@@ -70,7 +70,7 @@ data "coder_parameter" "ai_prompt" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.2.1"
+  version  = "4.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/project"
 
@@ -89,9 +89,11 @@ module "claude-code" {
   mcp = <<-EOF
   {
     "mcpServers": {
-      "my-custom-tool": {
-        "command": "my-tool-server"
-        "args": ["--port", "8080"]
+      "memory": {
+        "type": "stdio",
+        "command": "npx",
+        "args": ["-y", "@modelcontextprotocol/server-memory"],
+        "env": {}
       }
     }
   }
@@ -106,7 +108,7 @@ 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             = "4.2.1"
+  version             = "4.2.2"
   agent_id            = coder_agent.example.id
   workdir             = "/home/coder"
   install_claude_code = true
@@ -129,7 +131,7 @@ variable "claude_code_oauth_token" {
 
 module "claude-code" {
   source                  = "registry.coder.com/coder/claude-code/coder"
-  version                 = "4.2.1"
+  version                 = "4.2.2"
   agent_id                = coder_agent.example.id
   workdir                 = "/home/coder/project"
   claude_code_oauth_token = var.claude_code_oauth_token
@@ -202,7 +204,7 @@ resource "coder_env" "bedrock_api_key" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.2.1"
+  version  = "4.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/project"
   model    = "global.anthropic.claude-sonnet-4-5-20250929-v1:0"
@@ -259,7 +261,7 @@ resource "coder_env" "google_application_credentials" {
 
 module "claude-code" {
   source   = "registry.coder.com/coder/claude-code/coder"
-  version  = "4.2.1"
+  version  = "4.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/project"
   model    = "claude-sonnet-4@20250514"

registry/coder/modules/claude-code/scripts/install.sh

@@ -68,13 +68,16 @@ function setup_claude_configurations() {
   mkdir -p "$module_path"
 
   if [ "$ARG_MCP" != "" ]; then
-    while IFS= read -r server_name && IFS= read -r server_json; do
-      echo "------------------------"
-      echo "Executing: claude mcp add \"$server_name\" '$server_json'"
-      claude mcp add "$server_name" "$server_json"
-      echo "------------------------"
-      echo ""
-    done < <(echo "$ARG_MCP" | jq -r '.mcpServers | to_entries[] | .key, (.value | @json)')
+    (
+      cd "$ARG_WORKDIR"
+      while IFS= read -r server_name && IFS= read -r server_json; do
+        echo "------------------------"
+        echo "Executing: claude mcp add-json \"$server_name\" '$server_json' (in $ARG_WORKDIR)"
+        claude mcp add-json "$server_name" "$server_json"
+        echo "------------------------"
+        echo ""
+      done < <(echo "$ARG_MCP" | jq -r '.mcpServers | to_entries[] | .key, (.value | @json)')
+    )
   fi
 
   if [ -n "$ARG_ALLOWED_TOOLS" ]; then