Fix(gemini): the Coder MCP server configuration (#882)

## Description

Fixed the Coder MCP server configuration

* Added the full path to the coder binary for Gemini
* Removed unnecessary configuration fields

<img width="1365" height="715" alt="Screenshot 2026-05-04 120727"
src="https://github.com/user-attachments/assets/35cdb18f-c4a5-437d-8ad6-38134104e5e6"
/>
<img width="1365" height="717" alt="Screenshot 2026-05-04 120836"
src="https://github.com/user-attachments/assets/bdce543e-dd7f-4122-b356-896d08e1fd3f"
/>

## 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-labs/modules/gemini`  
**New version:** `v1.0.0`  
**Breaking change:** [ ] Yes [ ] No

## Testing & Validation

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

## Related Issues

fix: #881

registry/coder-labs/modules/gemini/README.md

@@ -13,7 +13,7 @@ Run [Gemini CLI](https://github.com/google-gemini/gemini-cli) in your workspace
 ```tf
 module "gemini" {
   source   = "registry.coder.com/coder-labs/gemini/coder"
-  version  = "3.0.0"
+  version  = "3.0.1"
   agent_id = coder_agent.main.id
   folder   = "/home/coder/project"
 }
@@ -46,7 +46,7 @@ variable "gemini_api_key" {
 
 module "gemini" {
   source         = "registry.coder.com/coder-labs/gemini/coder"
-  version        = "3.0.0"
+  version        = "3.0.1"
   agent_id       = coder_agent.main.id
   gemini_api_key = var.gemini_api_key
   folder         = "/home/coder/project"
@@ -94,7 +94,7 @@ data "coder_parameter" "ai_prompt" {
 module "gemini" {
   count                = data.coder_workspace.me.start_count
   source               = "registry.coder.com/coder-labs/gemini/coder"
-  version              = "3.0.0"
+  version              = "3.0.1"
   agent_id             = coder_agent.main.id
   gemini_api_key       = var.gemini_api_key
   gemini_model         = "gemini-2.5-flash"
@@ -105,6 +105,22 @@ module "gemini" {
     You are a helpful coding assistant. Always explain your code changes clearly.
     YOU MUST REPORT ALL TASKS TO CODER.
   EOT
+  pre_install_script   = <<-EOT
+    #!/bin/bash
+    set -e
+
+    echo "Installing Node.js via NodeSource..."
+
+    sudo apt-get update -qq && sudo apt-get install -y curl ca-certificates
+
+    curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo bash -
+
+    sudo apt-get install -y nodejs
+
+    echo "Node version: $(node -v)"
+    echo "npm version: $(npm -v)"
+    echo "Node install complete."
+  EOT
 }
 ```
 
@@ -118,7 +134,7 @@ For enterprise users who prefer Google's Vertex AI platform:
 ```tf
 module "gemini" {
   source         = "registry.coder.com/coder-labs/gemini/coder"
-  version        = "3.0.0"
+  version        = "3.0.1"
   agent_id       = coder_agent.main.id
   gemini_api_key = var.gemini_api_key
   folder         = "/home/coder/project"

registry/coder-labs/modules/gemini/main.tf

@@ -148,22 +148,16 @@ locals {
   base_extensions = <<-EOT
 {
   "coder": {
+    "command": "coder",
     "args": [
       "exp",
       "mcp",
       "server"
     ],
-    "command": "coder",
-    "description": "Report ALL tasks and statuses (in progress, done, failed) you are working on.",
-    "enabled": true,
     "env": {
       "CODER_MCP_APP_STATUS_SLUG": "${local.app_slug}",
       "CODER_MCP_AI_AGENTAPI_URL": "http://localhost:3284"
-    },
-    "name": "Coder",
-    "timeout": 3000,
-    "type": "stdio",
-    "trust": true
+    }
   }
 }
 EOT

registry/coder-labs/modules/gemini/scripts/install.sh

@@ -17,6 +17,7 @@ echo "--------------------------------"
 printf "gemini_config: %s\n" "$ARG_GEMINI_CONFIG"
 printf "install: %s\n" "$ARG_INSTALL"
 printf "gemini_version: %s\n" "$ARG_GEMINI_VERSION"
+printf "BASE_EXTENSIONS: %s\n" "$BASE_EXTENSIONS"
 echo "--------------------------------"
 
 set +o nounset
@@ -140,6 +141,25 @@ function add_system_prompt_if_exists() {
   fi
 }
 
+function patch_coder_mcp_command() {
+  CODER_BIN=$(which coder)
+  SETTINGS_PATH="$HOME/.gemini/settings.json"
+
+  if [ -z "$CODER_BIN" ]; then
+    printf "Warning: could not find coder binary, MCP command path not patched.\n"
+    return
+  fi
+
+  printf "Patching coder MCP command path to: %s\n" "$CODER_BIN"
+
+  TMP_SETTINGS=$(mktemp)
+  jq --arg bin "$CODER_BIN" \
+    '.mcpServers.coder.command = $bin' \
+    "$SETTINGS_PATH" > "$TMP_SETTINGS" && mv "$TMP_SETTINGS" "$SETTINGS_PATH"
+
+  printf "Patch complete.\n"
+}
+
 function configure_mcp() {
   export CODER_MCP_APP_STATUS_SLUG="gemini"
   export CODER_MCP_AI_AGENTAPI_URL="http://localhost:3284"
@@ -149,4 +169,5 @@ function configure_mcp() {
 install_gemini
 populate_settings_json
 add_system_prompt_if_exists
+patch_coder_mcp_command
 configure_mcp