diff --git a/app/graphql/mutations/ci/pipeline/create.rb b/app/graphql/mutations/ci/pipeline/create.rb
index 2b5c34f12f5da57197d1ede25d8b8a399abe12f0..ccc64cdbb92174590d372b5367763716cc385251 100644
--- a/app/graphql/mutations/ci/pipeline/create.rb
+++ b/app/graphql/mutations/ci/pipeline/create.rb
@@ -44,10 +44,14 @@ class Create < BaseMutation
 
         def resolve(project_path:, ref:, async: false, variables: {})
           project = authorized_find!(project_path)
-          creation_params = { ref: ref, variables_attributes: variables.map(&:to_h) }
+          inputs = variables.to_h do |var|
+            [var[:key], var[:value]]
+          end
+          creation_params = { ref: ref }
+          execute_params = { inputs: inputs }
           service = ::Ci::CreatePipelineService.new(project, current_user, creation_params)
 
-          response = execute_service(service, source, async)
+          response = execute_service(service, source, execute_params, async)
 
           if response.success?
             if async
@@ -62,11 +66,11 @@ def resolve(project_path:, ref:, async: false, variables: {})
 
         private
 
-        def execute_service(service, source, async)
+        def execute_service(service, source, execute_params, async)
           if async
-            service.execute_async(source, EXECUTE_OPTIONS)
+            service.execute_async(source, EXECUTE_OPTIONS.merge(execute_params))
           else
-            service.execute(source, **EXECUTE_OPTIONS)
+            service.execute(source, **EXECUTE_OPTIONS.merge(execute_params))
           end
         end
 
diff --git a/app/models/ci/bridge.rb b/app/models/ci/bridge.rb
index 5183e149617a896e32dccd921d50981dd9d1c38c..71ebe939113fcd48e73a18e29f0fc3bd6eeecdf4 100644
--- a/app/models/ci/bridge.rb
+++ b/app/models/ci/bridge.rb
@@ -325,7 +325,8 @@ def cross_project_params
         },
         execute_params: {
           ignore_skip_ci: true,
-          bridge: self
+          bridge: self,
+          inputs: options&.dig(:trigger, :inputs)
         }
       }
     end
diff --git a/app/services/ci/create_pipeline_service.rb b/app/services/ci/create_pipeline_service.rb
index 6a7a810bd392d6926716f5dab8735b9980df23ad..f9b1775dc794b4f2b27284627b92985341149803 100644
--- a/app/services/ci/create_pipeline_service.rb
+++ b/app/services/ci/create_pipeline_service.rb
@@ -154,8 +154,8 @@ def validate_options!(_)
     # :nocov:
     # rubocop:enable Gitlab/NoCodeCoverageComment
 
-    def extra_options(content: nil, dry_run: false)
-      { content: content, dry_run: dry_run }
+    def extra_options(content: nil, dry_run: false, inputs: {})
+      { content: content, dry_run: dry_run, inputs: inputs }
     end
 
     def build_logger
diff --git a/app/services/ci/list_config_variables_service.rb b/app/services/ci/list_config_variables_service.rb
index 1e40241f2aecf8c60cd720510216ff4664200beb..72cee2d7b0d2eb7a26ae761ad43dd943be35975f 100644
--- a/app/services/ci/list_config_variables_service.rb
+++ b/app/services/ci/list_config_variables_service.rb
@@ -2,59 +2,36 @@
 
 module Ci
   class ListConfigVariablesService < ::BaseService
-    include ReactiveCaching
-
-    self.reactive_cache_key = ->(service) { [service.class.name, service.id] }
-    self.reactive_cache_work_type = :external_dependency
-    self.reactive_cache_worker_finder = ->(id, *_args) { from_cache(id) }
-
-    def self.from_cache(id)
-      project_id, user_id = id.split('-')
-
-      project = Project.find(project_id)
-      user = User.find(user_id)
-
-      new(project, user)
-    end
-
     def execute(ref)
-      # "ref" is not a enough for a cache key because the name is static but that branch can be changed any time
       sha = project.commit(ref).try(:sha)
-
-      with_reactive_cache(sha, ref) { |result| result }
-    end
-
-    def calculate_reactive_cache(sha, ref)
       config = ::Gitlab::Ci::ProjectConfig.new(project: project, sha: sha)
 
-      return {} unless config.exists?
+      return {} if !config.project_setting? || !config.exists?
 
-      result = execute_yaml_processor(sha, ref, config)
-
-      result.valid? ? result.root_variables_with_prefill_data : {}
-    end
+      result = spec(config, sha)
 
-    # Required for ReactiveCaching, it is also used in `reactive_cache_worker_finder`
-    def id
-      "#{project.id}-#{current_user.id}"
+      result[:inputs].transform_values do |details|
+        { value: details[:default], description: details[:description] }
+      end
     end
 
     private
 
-    def execute_yaml_processor(sha, ref, config)
-      # The `ref` parameter should be branch or tag name. However, the API also accepts a commit SHA and we can't
-      # change it to not introduce breaking changes. Instead, here we're checking if a commit SHA is passed
-      # as `ref`. If so, we should verify the sha whether it belongs to the project in YamlProcessor.
-      sha_passed_as_ref_parameter = !project.repository.branch_or_tag?(ref)
-
-      Gitlab::Ci::YamlProcessor.new(
-        config.content,
-        project: project,
-        user: current_user,
-        sha: sha,
-        ref: ref,
-        verify_project_sha: sha_passed_as_ref_parameter
-      ).execute
+    def spec(config, sha)
+      context = ::Gitlab::Ci::Config::External::Context.new(project: project, user: current_user, sha: sha)
+      yaml_content = ::Gitlab::Ci::Config::Yaml.load!(config.content)
+      locations = yaml_content[:include]
+      files = ::Gitlab::Ci::Config::External::Mapper::Matcher.new(context).process(locations)
+
+      file = files.first
+
+      file.validate_location!
+      file.preload_context if file.valid?
+      file.validate_context! if file.valid?
+      file.preload_content if file.valid?
+      file.validate_content! if file.valid?
+
+      Gitlab::Ci::Config::Yaml::Loader.new(file.content).load_uninterpolated_yaml.spec
     end
   end
 end
diff --git a/lib/gitlab/ci/config/entry/trigger.rb b/lib/gitlab/ci/config/entry/trigger.rb
index a9d509c46cba2b180eecd9de690ad626dde27535..41816edbbd7d043a8d299738ed4bcd276c5080b9 100644
--- a/lib/gitlab/ci/config/entry/trigger.rb
+++ b/lib/gitlab/ci/config/entry/trigger.rb
@@ -35,8 +35,8 @@ class CrossProjectTrigger < ::Gitlab::Config::Entry::Node
               include ::Gitlab::Config::Entry::Attributable
               include ::Gitlab::Config::Entry::Configurable
 
-              ALLOWED_KEYS = %i[project branch strategy forward].freeze
-              attributes :project, :branch, :strategy
+              ALLOWED_KEYS = %i[project branch strategy forward inputs].freeze
+              attributes :project, :branch, :strategy, :inputs
 
               validations do
                 validates :config, presence: true
@@ -53,7 +53,8 @@ def value
                 { project: project,
                   branch: branch,
                   strategy: strategy,
-                  forward: forward_value }.compact
+                  forward: forward_value,
+                  inputs: inputs }.compact
               end
             end
 
diff --git a/lib/gitlab/ci/config/interpolation/inputs/boolean_input.rb b/lib/gitlab/ci/config/interpolation/inputs/boolean_input.rb
index 51845a2fea89c28d22abb507675016a8ba5d6be8..960235ef67bd5fcfa3fe95a5ecbaefe8ae6ce132 100644
--- a/lib/gitlab/ci/config/interpolation/inputs/boolean_input.rb
+++ b/lib/gitlab/ci/config/interpolation/inputs/boolean_input.rb
@@ -14,7 +14,8 @@ def self.type_name
 
             override :validate_type
             def validate_type(value, default)
-              return if [true, false].include?(value)
+              bool_value = Gitlab::Utils.to_boolean(value)
+              return if [true, false].include?(bool_value)
 
               error("#{default ? 'default' : 'provided'} value is not a boolean")
             end
diff --git a/lib/gitlab/ci/pipeline/chain/command.rb b/lib/gitlab/ci/pipeline/chain/command.rb
index 33cc3b190df90690aae6eeb184f58e65c803054b..e5df3c75be748eaf21b25f8e03d8ab241ecc06c1 100644
--- a/lib/gitlab/ci/pipeline/chain/command.rb
+++ b/lib/gitlab/ci/pipeline/chain/command.rb
@@ -13,7 +13,7 @@ module Chain
           :chat_data, :allow_mirror_update, :bridge, :content, :dry_run, :logger, :pipeline_policy_context,
           # These attributes are set by Chains during processing:
           :config_content, :yaml_processor_result, :workflow_rules_result, :pipeline_seed,
-          :pipeline_config, :partition_id,
+          :pipeline_config, :partition_id, :inputs,
           keyword_init: true
         ) do
           include Gitlab::Utils::StrongMemoize
diff --git a/lib/gitlab/ci/pipeline/chain/config/content.rb b/lib/gitlab/ci/pipeline/chain/config/content.rb
index 378ff58d31d9dedc7b1902cb57e14e7052e5fb63..cdd9a0825d35bc0315a0573c109d63c71aed986f 100644
--- a/lib/gitlab/ci/pipeline/chain/config/content.rb
+++ b/lib/gitlab/ci/pipeline/chain/config/content.rb
@@ -34,7 +34,8 @@ def pipeline_config
                   pipeline_source: @command.source, pipeline_source_bridge: @command.bridge,
                   triggered_for_branch: @pipeline.branch?,
                   ref: @pipeline.ref,
-                  pipeline_policy_context: @command.pipeline_policy_context
+                  pipeline_policy_context: @command.pipeline_policy_context,
+                  inputs: @command.inputs
                 )
               end
             end
diff --git a/lib/gitlab/ci/project_config.rb b/lib/gitlab/ci/project_config.rb
index 4d789685666719bfe5a648dfd652650e321b6fb7..3007557a22c23b8fa19120bdcf35d52876ad5c84 100644
--- a/lib/gitlab/ci/project_config.rb
+++ b/lib/gitlab/ci/project_config.rb
@@ -24,9 +24,9 @@ class ProjectConfig
 
       FALLBACK_POLICY_SOURCE = ProjectConfig::SecurityPolicyDefault
 
-      def initialize(
+      def initialize( # rubocop:disable Metrics/ParameterLists -- we need all these parameters
         project:, sha:, custom_content: nil, pipeline_source: nil, pipeline_source_bridge: nil,
-        triggered_for_branch: nil, ref: nil, pipeline_policy_context: nil)
+        triggered_for_branch: nil, ref: nil, pipeline_policy_context: nil, inputs: nil)
 
         unless pipeline_policy_context&.applying_config_override?
           @config = find_source(project: project,
@@ -35,7 +35,8 @@ def initialize(
             pipeline_source: pipeline_source,
             pipeline_source_bridge: pipeline_source_bridge,
             triggered_for_branch: triggered_for_branch,
-            ref: ref
+            ref: ref,
+            inputs: inputs
           )
 
           return if @config
@@ -59,10 +60,15 @@ def exists?
         !!@config&.exists?
       end
 
+      def project_setting?
+        @config.is_a?(ProjectConfig::ProjectSetting)
+      end
+
       private
 
       def find_source(
-        project:, sha:, custom_content:, pipeline_source:, pipeline_source_bridge:, triggered_for_branch:, ref:)
+        project:, sha:, custom_content:, pipeline_source:, pipeline_source_bridge:, triggered_for_branch:, ref:,
+        inputs:)
         STANDARD_SOURCES.each do |source|
           source_config = source.new(project: project,
             sha: sha,
@@ -70,7 +76,8 @@ def find_source(
             pipeline_source: pipeline_source,
             pipeline_source_bridge: pipeline_source_bridge,
             triggered_for_branch: triggered_for_branch,
-            ref: ref
+            ref: ref,
+            inputs: inputs
           )
 
           return source_config if source_config.exists?
diff --git a/lib/gitlab/ci/project_config/project_setting.rb b/lib/gitlab/ci/project_config/project_setting.rb
index 9c1405b6bd27075d24a6147e2aa2c2285aedef8f..d9333e2aaba14dfe3c96b5865e925416cad1ae5c 100644
--- a/lib/gitlab/ci/project_config/project_setting.rb
+++ b/lib/gitlab/ci/project_config/project_setting.rb
@@ -78,7 +78,7 @@ def remote_config_path?
         end
 
         def ci_yaml_include(config)
-          YAML.dump('include' => [config])
+          YAML.dump('include' => [config.merge('inputs' => inputs)])
         end
       end
     end
diff --git a/lib/gitlab/ci/project_config/source.rb b/lib/gitlab/ci/project_config/source.rb
index d376b9f4540dd0aa9649098c63f1bffb8a252971..8431bed5253141188ddc77bfc0a386c07f6056b0 100644
--- a/lib/gitlab/ci/project_config/source.rb
+++ b/lib/gitlab/ci/project_config/source.rb
@@ -8,7 +8,7 @@ class Source
 
         def initialize(
           project:, sha:, custom_content: nil, pipeline_source: nil, pipeline_source_bridge: nil,
-          triggered_for_branch: false, ref: nil)
+          triggered_for_branch: false, ref: nil, inputs: {})
           @project = project
           @sha = sha
           @custom_content = custom_content
@@ -16,6 +16,7 @@ def initialize(
           @pipeline_source_bridge = pipeline_source_bridge
           @triggered_for_branch = triggered_for_branch
           @ref = ref
+          @inputs = inputs
         end
 
         def exists?
@@ -44,7 +45,7 @@ def url
         private
 
         attr_reader :project, :sha, :custom_content, :pipeline_source, :pipeline_source_bridge, :triggered_for_branch,
-          :ref
+          :ref, :inputs
 
         def ci_config_path
           @ci_config_path ||= project.ci_config_path_or_default