feat: captain custom tools v1 (#13890)

# Pull Request Template

## Description

Adds custom tool support to v1

## Type of change
- [x] New feature (non-breaking change which adds functionality)


## How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration.

<img width="1816" height="958" alt="CleanShot 2026-03-24 at 11 37 33@2x"
src="https://github.com/user-attachments/assets/2777a953-8b65-4a2d-88ec-39f395b3fb47"
/>

<img width="378" height="488" alt="CleanShot 2026-03-24 at 11 38 18@2x"
src="https://github.com/user-attachments/assets/f6973c99-efd0-40e4-90fe-4472a2f63cea"
/>

<img width="1884" height="1452" alt="CleanShot 2026-03-24 at 11 38
32@2x"
src="https://github.com/user-attachments/assets/9fba4fc4-0c33-46da-888a-52ec6bad6130"
/>



## Checklist:

- [x] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

enterprise/app/controllers/api/v1/accounts/captain/custom_tools_controller.rb

@@ -1,16 +1,19 @@
 class Api::V1::Accounts::Captain::CustomToolsController < Api::V1::Accounts::BaseController
   before_action :current_account
+  before_action :ensure_custom_tools_enabled
   before_action -> { check_authorization(Captain::CustomTool) }
   before_action :set_custom_tool, only: [:show, :update, :destroy]
 
   def index
-    @custom_tools = account_custom_tools.enabled
+    @custom_tools = account_custom_tools
   end
 
   def show; end
 
   def create
     @custom_tool = account_custom_tools.create!(custom_tool_params)
+  rescue Captain::CustomTool::LimitExceededError => e
+    render_could_not_create_error(e.message)
   end
 
   def update
@@ -22,8 +25,22 @@ class Api::V1::Accounts::Captain::CustomToolsController < Api::V1::Accounts::Bas
     head :no_content
   end
 
+  def test
+    tool = account_custom_tools.new(custom_tool_params)
+    result = execute_test_request(tool)
+    render json: { status: result.code.to_i, body: result.body.to_s.truncate(500) }
+  rescue StandardError => e
+    render json: { error: e.message }, status: :unprocessable_content
+  end
+
   private
 
+  def ensure_custom_tools_enabled
+    return if Current.account.feature_enabled?('custom_tools') || Current.account.feature_enabled?('captain_integration_v2')
+
+    render json: { error: 'Custom tools are not enabled for this account' }, status: :forbidden
+  end
+
   def set_custom_tool
     @custom_tool = account_custom_tools.find(params[:id])
   end
@@ -32,6 +49,11 @@ class Api::V1::Accounts::Captain::CustomToolsController < Api::V1::Accounts::Bas
     @account_custom_tools ||= Current.account.captain_custom_tools
   end
 
+  def execute_test_request(tool)
+    http_tool = Captain::Tools::HttpTool.new(nil, tool)
+    http_tool.send(:execute_http_request, tool.endpoint_url, nil, nil)
+  end
+
   def custom_tool_params
     params.require(:custom_tool).permit(
       :title,