Merge branch 'id-migrate-fix-code-prompt' into 'master'

Migrate FixCode tool

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167399



Merged-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Reviewed-by: Igor Drozdov <idrozdov@gitlab.com>
Reviewed-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Co-authored-by: Igor Drozdov <idrozdov@gitlab.com>

config/feature_flags/experiment/prompt_migration_fix_code.yml

+---
+name: prompt_migration_fix_code
+feature_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/475047
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167399
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/496750
+milestone: '17.5'
+group: group::custom models
+type: experiment
+default_enabled: false

ee/lib/gitlab/llm/chain/tools/fix_code/executor.rb

@@ -7,6 +7,7 @@ module Tools
         module FixCode
           class Executor < SlashCommandTool
             extend ::Gitlab::Utils::Override
+            prepend Concerns::UseAiGatewayAgentPrompt
 
             NAME = 'FixCode'
             HUMAN_NAME = 'Fix Code'

ee/spec/lib/gitlab/llm/chain/tools/fix_code/executor_spec.rb

@@ -133,6 +133,11 @@
           expect(answer.error_code).to eq("M4000")
         end
       end
+
+      it_behaves_like 'uses ai gateway agent prompt' do
+        let(:prompt_class) { Gitlab::Llm::Chain::Tools::FixCode::Prompts::Anthropic }
+        let(:unit_primitive) { 'fix_code' }
+      end
     end
 
     context 'when context is not authorized' do