diff --git a/CMakeLists.txt b/CMakeLists.txt
index 08f4ba0..86b8342 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -284,6 +284,17 @@ set(JSON_CONFIG_SOURCES
     src/services/impl/json_config_migration_service.cpp
 )
 
+set(WORKFLOW_SOURCES
+    src/services/impl/workflow_step_io_resolver.cpp
+    src/services/impl/workflow_step_registry.cpp
+    src/services/impl/workflow_executor.cpp
+    src/services/impl/workflow_definition_parser.cpp
+    src/services/impl/workflow_config_load_step.cpp
+    src/services/impl/workflow_config_version_step.cpp
+    src/services/impl/workflow_config_schema_step.cpp
+    src/services/impl/workflow_default_step_registrar.cpp
+)
+
 if(BUILD_SDL3_APP)
     add_executable(sdl3_app
             src/main.cpp
@@ -291,6 +302,7 @@ if(BUILD_SDL3_APP)
             src/di/service_registry.cpp
             src/events/event_bus.cpp
             ${JSON_CONFIG_SOURCES}
+            ${WORKFLOW_SOURCES}
             src/services/impl/config_compiler_service.cpp
             src/services/impl/command_line_service.cpp
             src/services/impl/json_config_writer_service.cpp
diff --git a/ROADMAP.md b/ROADMAP.md
index a21e269..23ae9d5 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -226,6 +226,22 @@ Option B: per-shader only
 }
 ```
 
+## Workflow Engine (n8n-Style Micro Steps)
+### Goals
+- Describe boot + frame pipelines as a declarative JSON workflow graph.
+- Keep each step tiny (<100 LOC), with explicit inputs/outputs and DI-backed plugin lookup.
+- Package common pipelines as templates so users don't start from scratch.
+
+### Status
+- [~] Workflow core: step registry + executor + JSON definition parser.
+- [~] Default step package: `config.load`, `config.version.validate`, `config.schema.validate`.
+- [x] Workflow schema: `config/schema/workflow_v1.schema.json`.
+- [x] Template package: `config/workflows/templates/boot_default.json`.
+
+### Next Steps
+- Wire boot pipeline to use workflow executor (config load/validate/migrate).
+- Add frame workflow template (BeginFrame → RenderGraph → Capture → Validate).
+
 ## Feature Matrix (What You Get, When You Get It)
 
 | Feature | Status | Starter | Pro | Ultra | Enterprise |
@@ -267,6 +283,7 @@ Option B: per-shader only
 - [~] Budget enforcement tests (GUI cache pruning + texture tracker covered; transient pool pending)
 - [~] Config-driven validation tour (checkpoint captures + image/ratio/luma/sample-point checks)
 - [ ] Smoke test: cube demo boots with config-first scene definition
+- [ ] Workflow parser tests (template loading + invalid step diagnostics)
 
 ## Test Strategy (Solid Coverage Plan)
 ### Goals
diff --git a/config/schema/workflow_v1.schema.json b/config/schema/workflow_v1.schema.json
new file mode 100644
index 0000000..9fa2eb7
--- /dev/null
+++ b/config/schema/workflow_v1.schema.json
@@ -0,0 +1,45 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "SDL3CPP Workflow v1",
+  "type": "object",
+  "properties": {
+    "template": {
+      "type": "string"
+    },
+    "steps": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": [
+          "id",
+          "plugin"
+        ],
+        "properties": {
+          "id": {
+            "type": "string"
+          },
+          "plugin": {
+            "type": "string"
+          },
+          "inputs": {
+            "type": "object",
+            "additionalProperties": {
+              "type": "string"
+            }
+          },
+          "outputs": {
+            "type": "object",
+            "additionalProperties": {
+              "type": "string"
+            }
+          }
+        },
+        "additionalProperties": false
+      }
+    }
+  },
+  "required": [
+    "steps"
+  ],
+  "additionalProperties": false
+}
diff --git a/config/workflows/templates/boot_default.json b/config/workflows/templates/boot_default.json
new file mode 100644
index 0000000..19e684f
--- /dev/null
+++ b/config/workflows/templates/boot_default.json
@@ -0,0 +1,34 @@
+{
+  "template": "boot.default",
+  "steps": [
+    {
+      "id": "load_config",
+      "plugin": "config.load",
+      "inputs": {
+        "path": "config.path"
+      },
+      "outputs": {
+        "document": "config.document"
+      }
+    },
+    {
+      "id": "validate_version",
+      "plugin": "config.version.validate",
+      "inputs": {
+        "document": "config.document",
+        "path": "config.path"
+      },
+      "outputs": {
+        "version": "config.version"
+      }
+    },
+    {
+      "id": "validate_schema",
+      "plugin": "config.schema.validate",
+      "inputs": {
+        "document": "config.document",
+        "path": "config.path"
+      }
+    }
+  ]
+}
diff --git a/src/app/service_based_app.cpp b/src/app/service_based_app.cpp
index 20940e3..8cbd62d 100644
--- a/src/app/service_based_app.cpp
+++ b/src/app/service_based_app.cpp
@@ -37,11 +37,16 @@
 #include "services/impl/logger_service.hpp"
 #include "services/impl/pipeline_compiler_service.hpp"
 #include "services/impl/validation_tour_service.hpp"
+#include "services/impl/workflow_default_step_registrar.hpp"
+#include "services/impl/workflow_executor.hpp"
+#include "services/impl/workflow_step_registry.hpp"
 #include "services/interfaces/i_platform_service.hpp"
 #include "services/interfaces/i_probe_service.hpp"
 #include "services/interfaces/i_render_graph_service.hpp"
 #include "services/interfaces/i_shader_system_registry.hpp"
 #include "services/interfaces/i_validation_tour_service.hpp"
+#include "services/interfaces/i_workflow_executor.hpp"
+#include "services/interfaces/i_workflow_step_registry.hpp"
 #include "services/interfaces/i_config_compiler_service.hpp"
 #include <iostream>
 #include <stdexcept>
@@ -223,6 +228,16 @@ void ServiceBasedApp::RegisterServices() {
     registry_.RegisterService<services::IProbeService, services::impl::ProbeService>(
         registry_.GetService<services::ILogger>());
 
+    // Workflow step registry + executor (declarative boot/frame pipelines)
+    registry_.RegisterService<services::IWorkflowStepRegistry, services::impl::WorkflowStepRegistry>();
+    registry_.RegisterService<services::IWorkflowExecutor, services::impl::WorkflowExecutor>(
+        registry_.GetService<services::IWorkflowStepRegistry>(),
+        registry_.GetService<services::ILogger>());
+    services::impl::WorkflowDefaultStepRegistrar workflowRegistrar(
+        registry_.GetService<services::ILogger>(),
+        registry_.GetService<services::IProbeService>());
+    workflowRegistrar.RegisterDefaults(registry_.GetService<services::IWorkflowStepRegistry>());
+
     // Configuration service
     registry_.RegisterService<services::IConfigService, services::impl::JsonConfigService>(
         registry_.GetService<services::ILogger>(),
diff --git a/src/services/impl/workflow_config_load_step.cpp b/src/services/impl/workflow_config_load_step.cpp
new file mode 100644
index 0000000..50874f9
--- /dev/null
+++ b/src/services/impl/workflow_config_load_step.cpp
@@ -0,0 +1,40 @@
+#include "workflow_config_load_step.hpp"
+#include "json_config_document_loader.hpp"
+#include "workflow_step_io_resolver.hpp"
+
+#include <rapidjson/document.h>
+
+#include <filesystem>
+#include <memory>
+#include <stdexcept>
+#include <string>
+
+namespace sdl3cpp::services::impl {
+
+WorkflowConfigLoadStep::WorkflowConfigLoadStep(std::shared_ptr<ILogger> logger)
+    : logger_(std::move(logger)) {}
+
+std::string WorkflowConfigLoadStep::GetPluginId() const {
+    return "config.load";
+}
+
+void WorkflowConfigLoadStep::Execute(const WorkflowStepDefinition& step, WorkflowContext& context) {
+    WorkflowStepIoResolver resolver;
+    const std::string pathKey = resolver.GetRequiredInputKey(step, "path");
+    std::filesystem::path pathValue;
+    if (const auto* path = context.TryGet<std::filesystem::path>(pathKey)) {
+        pathValue = *path;
+    } else if (const auto* pathString = context.TryGet<std::string>(pathKey)) {
+        pathValue = *pathString;
+    } else {
+        throw std::runtime_error("Workflow config.load missing path input '" + pathKey + "'");
+    }
+
+    json_config::JsonConfigDocumentLoader loader(logger_);
+    auto document = std::make_shared<rapidjson::Document>(loader.Load(pathValue));
+
+    const std::string outputKey = resolver.GetRequiredOutputKey(step, "document");
+    context.Set(outputKey, std::move(document));
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_config_load_step.hpp b/src/services/impl/workflow_config_load_step.hpp
new file mode 100644
index 0000000..22cbdda
--- /dev/null
+++ b/src/services/impl/workflow_config_load_step.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "../interfaces/i_workflow_step.hpp"
+#include "../interfaces/i_logger.hpp"
+
+#include <memory>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowConfigLoadStep : public IWorkflowStep {
+public:
+    explicit WorkflowConfigLoadStep(std::shared_ptr<ILogger> logger);
+
+    std::string GetPluginId() const override;
+    void Execute(const WorkflowStepDefinition& step, WorkflowContext& context) override;
+
+private:
+    std::shared_ptr<ILogger> logger_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_config_schema_step.cpp b/src/services/impl/workflow_config_schema_step.cpp
new file mode 100644
index 0000000..1810c1e
--- /dev/null
+++ b/src/services/impl/workflow_config_schema_step.cpp
@@ -0,0 +1,45 @@
+#include "workflow_config_schema_step.hpp"
+#include "json_config_schema_validator.hpp"
+#include "workflow_step_io_resolver.hpp"
+
+#include <rapidjson/document.h>
+
+#include <filesystem>
+#include <memory>
+#include <stdexcept>
+#include <string>
+
+namespace sdl3cpp::services::impl {
+
+WorkflowConfigSchemaStep::WorkflowConfigSchemaStep(std::shared_ptr<ILogger> logger,
+                                                   std::shared_ptr<IProbeService> probeService)
+    : logger_(std::move(logger)),
+      probeService_(std::move(probeService)) {}
+
+std::string WorkflowConfigSchemaStep::GetPluginId() const {
+    return "config.schema.validate";
+}
+
+void WorkflowConfigSchemaStep::Execute(const WorkflowStepDefinition& step, WorkflowContext& context) {
+    WorkflowStepIoResolver resolver;
+    const std::string documentKey = resolver.GetRequiredInputKey(step, "document");
+    const std::string pathKey = resolver.GetRequiredInputKey(step, "path");
+    const auto* document = context.TryGet<std::shared_ptr<rapidjson::Document>>(documentKey);
+    if (!document || !(*document)) {
+        throw std::runtime_error("Workflow config.schema.validate missing document input '" + documentKey + "'");
+    }
+
+    std::filesystem::path pathValue;
+    if (const auto* path = context.TryGet<std::filesystem::path>(pathKey)) {
+        pathValue = *path;
+    } else if (const auto* pathString = context.TryGet<std::string>(pathKey)) {
+        pathValue = *pathString;
+    } else {
+        throw std::runtime_error("Workflow config.schema.validate missing path input '" + pathKey + "'");
+    }
+
+    json_config::JsonConfigSchemaValidator validator(logger_, probeService_);
+    validator.ValidateOrThrow(**document, pathValue);
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_config_schema_step.hpp b/src/services/impl/workflow_config_schema_step.hpp
new file mode 100644
index 0000000..ee8492d
--- /dev/null
+++ b/src/services/impl/workflow_config_schema_step.hpp
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "../interfaces/i_workflow_step.hpp"
+#include "../interfaces/i_logger.hpp"
+#include "../interfaces/i_probe_service.hpp"
+
+#include <memory>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowConfigSchemaStep : public IWorkflowStep {
+public:
+    WorkflowConfigSchemaStep(std::shared_ptr<ILogger> logger,
+                             std::shared_ptr<IProbeService> probeService);
+
+    std::string GetPluginId() const override;
+    void Execute(const WorkflowStepDefinition& step, WorkflowContext& context) override;
+
+private:
+    std::shared_ptr<ILogger> logger_;
+    std::shared_ptr<IProbeService> probeService_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_config_version_step.cpp b/src/services/impl/workflow_config_version_step.cpp
new file mode 100644
index 0000000..4ee4d31
--- /dev/null
+++ b/src/services/impl/workflow_config_version_step.cpp
@@ -0,0 +1,46 @@
+#include "workflow_config_version_step.hpp"
+#include "json_config_version_validator.hpp"
+#include "workflow_step_io_resolver.hpp"
+
+#include <rapidjson/document.h>
+
+#include <filesystem>
+#include <memory>
+#include <stdexcept>
+#include <string>
+
+namespace sdl3cpp::services::impl {
+
+WorkflowConfigVersionStep::WorkflowConfigVersionStep(std::shared_ptr<ILogger> logger)
+    : logger_(std::move(logger)) {}
+
+std::string WorkflowConfigVersionStep::GetPluginId() const {
+    return "config.version.validate";
+}
+
+void WorkflowConfigVersionStep::Execute(const WorkflowStepDefinition& step, WorkflowContext& context) {
+    WorkflowStepIoResolver resolver;
+    const std::string documentKey = resolver.GetRequiredInputKey(step, "document");
+    const std::string pathKey = resolver.GetRequiredInputKey(step, "path");
+    const auto* document = context.TryGet<std::shared_ptr<rapidjson::Document>>(documentKey);
+    if (!document || !(*document)) {
+        throw std::runtime_error("Workflow config.version.validate missing document input '" + documentKey + "'");
+    }
+
+    std::filesystem::path pathValue;
+    if (const auto* path = context.TryGet<std::filesystem::path>(pathKey)) {
+        pathValue = *path;
+    } else if (const auto* pathString = context.TryGet<std::string>(pathKey)) {
+        pathValue = *pathString;
+    } else {
+        throw std::runtime_error("Workflow config.version.validate missing path input '" + pathKey + "'");
+    }
+
+    json_config::JsonConfigVersionValidator validator(logger_);
+    const auto version = validator.Validate(**document, pathValue);
+
+    const std::string outputKey = resolver.GetRequiredOutputKey(step, "version");
+    context.Set(outputKey, version);
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_config_version_step.hpp b/src/services/impl/workflow_config_version_step.hpp
new file mode 100644
index 0000000..9d782a5
--- /dev/null
+++ b/src/services/impl/workflow_config_version_step.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "../interfaces/i_workflow_step.hpp"
+#include "../interfaces/i_logger.hpp"
+
+#include <memory>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowConfigVersionStep : public IWorkflowStep {
+public:
+    explicit WorkflowConfigVersionStep(std::shared_ptr<ILogger> logger);
+
+    std::string GetPluginId() const override;
+    void Execute(const WorkflowStepDefinition& step, WorkflowContext& context) override;
+
+private:
+    std::shared_ptr<ILogger> logger_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_default_step_registrar.cpp b/src/services/impl/workflow_default_step_registrar.cpp
new file mode 100644
index 0000000..f1380ba
--- /dev/null
+++ b/src/services/impl/workflow_default_step_registrar.cpp
@@ -0,0 +1,24 @@
+#include "workflow_default_step_registrar.hpp"
+#include "workflow_config_load_step.hpp"
+#include "workflow_config_schema_step.hpp"
+#include "workflow_config_version_step.hpp"
+
+#include <stdexcept>
+
+namespace sdl3cpp::services::impl {
+
+WorkflowDefaultStepRegistrar::WorkflowDefaultStepRegistrar(std::shared_ptr<ILogger> logger,
+                                                           std::shared_ptr<IProbeService> probeService)
+    : logger_(std::move(logger)),
+      probeService_(std::move(probeService)) {}
+
+void WorkflowDefaultStepRegistrar::RegisterDefaults(const std::shared_ptr<IWorkflowStepRegistry>& registry) const {
+    if (!registry) {
+        throw std::runtime_error("WorkflowDefaultStepRegistrar: registry is null");
+    }
+    registry->RegisterStep(std::make_shared<WorkflowConfigLoadStep>(logger_));
+    registry->RegisterStep(std::make_shared<WorkflowConfigVersionStep>(logger_));
+    registry->RegisterStep(std::make_shared<WorkflowConfigSchemaStep>(logger_, probeService_));
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_default_step_registrar.hpp b/src/services/impl/workflow_default_step_registrar.hpp
new file mode 100644
index 0000000..ec8b60f
--- /dev/null
+++ b/src/services/impl/workflow_default_step_registrar.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "../interfaces/i_logger.hpp"
+#include "../interfaces/i_probe_service.hpp"
+#include "../interfaces/i_workflow_step_registry.hpp"
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowDefaultStepRegistrar {
+public:
+    WorkflowDefaultStepRegistrar(std::shared_ptr<ILogger> logger,
+                                 std::shared_ptr<IProbeService> probeService);
+
+    void RegisterDefaults(const std::shared_ptr<IWorkflowStepRegistry>& registry) const;
+
+private:
+    std::shared_ptr<ILogger> logger_;
+    std::shared_ptr<IProbeService> probeService_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_definition_parser.cpp b/src/services/impl/workflow_definition_parser.cpp
new file mode 100644
index 0000000..bf04fac
--- /dev/null
+++ b/src/services/impl/workflow_definition_parser.cpp
@@ -0,0 +1,71 @@
+#include "workflow_definition_parser.hpp"
+#include "json_config_document_parser.hpp"
+
+#include <rapidjson/document.h>
+
+#include <stdexcept>
+#include <string>
+#include <unordered_map>
+
+namespace sdl3cpp::services::impl {
+
+namespace {
+std::string ReadRequiredString(const rapidjson::Value& object, const char* name) {
+    if (!object.HasMember(name) || !object[name].IsString()) {
+        throw std::runtime_error("Workflow member '" + std::string(name) + "' must be a string");
+    }
+    return object[name].GetString();
+}
+
+std::unordered_map<std::string, std::string> ReadStringMap(const rapidjson::Value& object,
+                                                           const char* name) {
+    std::unordered_map<std::string, std::string> result;
+    if (!object.HasMember(name)) {
+        return result;
+    }
+    const auto& mapValue = object[name];
+    if (!mapValue.IsObject()) {
+        throw std::runtime_error("Workflow member '" + std::string(name) + "' must be an object");
+    }
+    for (auto it = mapValue.MemberBegin(); it != mapValue.MemberEnd(); ++it) {
+        if (!it->value.IsString()) {
+            throw std::runtime_error("Workflow map '" + std::string(name) + "' must map to strings");
+        }
+        result[it->name.GetString()] = it->value.GetString();
+    }
+    return result;
+}
+}  // namespace
+
+WorkflowDefinition WorkflowDefinitionParser::ParseFile(const std::filesystem::path& path) const {
+    json_config::JsonConfigDocumentParser parser;
+    rapidjson::Document document = parser.Parse(path, "workflow file");
+
+    if (!document.HasMember("steps") || !document["steps"].IsArray()) {
+        throw std::runtime_error("Workflow must contain a 'steps' array");
+    }
+
+    WorkflowDefinition workflow;
+    if (document.HasMember("template")) {
+        if (!document["template"].IsString()) {
+            throw std::runtime_error("Workflow member 'template' must be a string");
+        }
+        workflow.templateName = document["template"].GetString();
+    }
+
+    for (const auto& entry : document["steps"].GetArray()) {
+        if (!entry.IsObject()) {
+            throw std::runtime_error("Workflow steps must be objects");
+        }
+        WorkflowStepDefinition step;
+        step.id = ReadRequiredString(entry, "id");
+        step.plugin = ReadRequiredString(entry, "plugin");
+        step.inputs = ReadStringMap(entry, "inputs");
+        step.outputs = ReadStringMap(entry, "outputs");
+        workflow.steps.push_back(std::move(step));
+    }
+
+    return workflow;
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_definition_parser.hpp b/src/services/impl/workflow_definition_parser.hpp
new file mode 100644
index 0000000..4a77a86
--- /dev/null
+++ b/src/services/impl/workflow_definition_parser.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include "../interfaces/workflow_definition.hpp"
+
+#include <filesystem>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowDefinitionParser {
+public:
+    WorkflowDefinition ParseFile(const std::filesystem::path& path) const;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_executor.cpp b/src/services/impl/workflow_executor.cpp
new file mode 100644
index 0000000..9de5bfb
--- /dev/null
+++ b/src/services/impl/workflow_executor.cpp
@@ -0,0 +1,34 @@
+#include "workflow_executor.hpp"
+
+#include <stdexcept>
+
+namespace sdl3cpp::services::impl {
+
+WorkflowExecutor::WorkflowExecutor(std::shared_ptr<IWorkflowStepRegistry> registry,
+                                   std::shared_ptr<ILogger> logger)
+    : registry_(std::move(registry)),
+      logger_(std::move(logger)) {
+    if (!registry_) {
+        throw std::runtime_error("WorkflowExecutor requires a step registry");
+    }
+}
+
+void WorkflowExecutor::Execute(const WorkflowDefinition& workflow, WorkflowContext& context) {
+    if (logger_) {
+        logger_->Trace("WorkflowExecutor", "Execute",
+                       "steps=" + std::to_string(workflow.steps.size()),
+                       "Starting workflow execution");
+    }
+    for (const auto& step : workflow.steps) {
+        auto handler = registry_->GetStep(step.plugin);
+        if (!handler) {
+            throw std::runtime_error("WorkflowExecutor: no step registered for plugin '" + step.plugin + "'");
+        }
+        handler->Execute(step, context);
+    }
+    if (logger_) {
+        logger_->Trace("WorkflowExecutor", "Execute", "", "Workflow execution complete");
+    }
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_executor.hpp b/src/services/impl/workflow_executor.hpp
new file mode 100644
index 0000000..a6a8b6e
--- /dev/null
+++ b/src/services/impl/workflow_executor.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "../interfaces/i_workflow_executor.hpp"
+#include "../interfaces/i_workflow_step_registry.hpp"
+#include "../interfaces/i_logger.hpp"
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowExecutor : public IWorkflowExecutor {
+public:
+    WorkflowExecutor(std::shared_ptr<IWorkflowStepRegistry> registry,
+                     std::shared_ptr<ILogger> logger);
+
+    void Execute(const WorkflowDefinition& workflow, WorkflowContext& context) override;
+
+private:
+    std::shared_ptr<IWorkflowStepRegistry> registry_;
+    std::shared_ptr<ILogger> logger_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_step_io_resolver.cpp b/src/services/impl/workflow_step_io_resolver.cpp
new file mode 100644
index 0000000..8015684
--- /dev/null
+++ b/src/services/impl/workflow_step_io_resolver.cpp
@@ -0,0 +1,25 @@
+#include "workflow_step_io_resolver.hpp"
+
+#include <stdexcept>
+
+namespace sdl3cpp::services::impl {
+
+std::string WorkflowStepIoResolver::GetRequiredInputKey(const WorkflowStepDefinition& step,
+                                                        const std::string& name) const {
+    auto it = step.inputs.find(name);
+    if (it == step.inputs.end()) {
+        throw std::runtime_error("Workflow step '" + step.id + "' missing input '" + name + "'");
+    }
+    return it->second;
+}
+
+std::string WorkflowStepIoResolver::GetRequiredOutputKey(const WorkflowStepDefinition& step,
+                                                         const std::string& name) const {
+    auto it = step.outputs.find(name);
+    if (it == step.outputs.end()) {
+        throw std::runtime_error("Workflow step '" + step.id + "' missing output '" + name + "'");
+    }
+    return it->second;
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_step_io_resolver.hpp b/src/services/impl/workflow_step_io_resolver.hpp
new file mode 100644
index 0000000..e36f9ed
--- /dev/null
+++ b/src/services/impl/workflow_step_io_resolver.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "../interfaces/workflow_step_definition.hpp"
+
+#include <string>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowStepIoResolver {
+public:
+    std::string GetRequiredInputKey(const WorkflowStepDefinition& step, const std::string& name) const;
+    std::string GetRequiredOutputKey(const WorkflowStepDefinition& step, const std::string& name) const;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_step_registry.cpp b/src/services/impl/workflow_step_registry.cpp
new file mode 100644
index 0000000..4a3284a
--- /dev/null
+++ b/src/services/impl/workflow_step_registry.cpp
@@ -0,0 +1,26 @@
+#include "workflow_step_registry.hpp"
+
+#include <stdexcept>
+
+namespace sdl3cpp::services::impl {
+
+void WorkflowStepRegistry::RegisterStep(std::shared_ptr<IWorkflowStep> step) {
+    if (!step) {
+        throw std::runtime_error("WorkflowStepRegistry::RegisterStep: step is null");
+    }
+    const std::string pluginId = step->GetPluginId();
+    auto [it, inserted] = steps_.emplace(pluginId, std::move(step));
+    if (!inserted) {
+        throw std::runtime_error("WorkflowStepRegistry::RegisterStep: duplicate plugin '" + pluginId + "'");
+    }
+}
+
+std::shared_ptr<IWorkflowStep> WorkflowStepRegistry::GetStep(const std::string& pluginId) const {
+    auto it = steps_.find(pluginId);
+    if (it == steps_.end()) {
+        return nullptr;
+    }
+    return it->second;
+}
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/impl/workflow_step_registry.hpp b/src/services/impl/workflow_step_registry.hpp
new file mode 100644
index 0000000..05ab74f
--- /dev/null
+++ b/src/services/impl/workflow_step_registry.hpp
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "../interfaces/i_workflow_step_registry.hpp"
+
+#include <unordered_map>
+
+namespace sdl3cpp::services::impl {
+
+class WorkflowStepRegistry : public IWorkflowStepRegistry {
+public:
+    void RegisterStep(std::shared_ptr<IWorkflowStep> step) override;
+    std::shared_ptr<IWorkflowStep> GetStep(const std::string& pluginId) const override;
+
+private:
+    std::unordered_map<std::string, std::shared_ptr<IWorkflowStep>> steps_;
+};
+
+}  // namespace sdl3cpp::services::impl
diff --git a/src/services/interfaces/i_workflow_executor.hpp b/src/services/interfaces/i_workflow_executor.hpp
new file mode 100644
index 0000000..84013a3
--- /dev/null
+++ b/src/services/interfaces/i_workflow_executor.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "workflow_context.hpp"
+#include "workflow_definition.hpp"
+
+namespace sdl3cpp::services {
+
+class IWorkflowExecutor {
+public:
+    virtual ~IWorkflowExecutor() = default;
+
+    virtual void Execute(const WorkflowDefinition& workflow, WorkflowContext& context) = 0;
+};
+
+}  // namespace sdl3cpp::services
diff --git a/src/services/interfaces/i_workflow_step.hpp b/src/services/interfaces/i_workflow_step.hpp
new file mode 100644
index 0000000..b3c6618
--- /dev/null
+++ b/src/services/interfaces/i_workflow_step.hpp
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "workflow_context.hpp"
+#include "workflow_step_definition.hpp"
+
+#include <string>
+
+namespace sdl3cpp::services {
+
+class IWorkflowStep {
+public:
+    virtual ~IWorkflowStep() = default;
+
+    virtual std::string GetPluginId() const = 0;
+    virtual void Execute(const WorkflowStepDefinition& step, WorkflowContext& context) = 0;
+};
+
+}  // namespace sdl3cpp::services
diff --git a/src/services/interfaces/i_workflow_step_registry.hpp b/src/services/interfaces/i_workflow_step_registry.hpp
new file mode 100644
index 0000000..e2f27d9
--- /dev/null
+++ b/src/services/interfaces/i_workflow_step_registry.hpp
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "i_workflow_step.hpp"
+
+#include <memory>
+#include <string>
+
+namespace sdl3cpp::services {
+
+class IWorkflowStepRegistry {
+public:
+    virtual ~IWorkflowStepRegistry() = default;
+
+    virtual void RegisterStep(std::shared_ptr<IWorkflowStep> step) = 0;
+    virtual std::shared_ptr<IWorkflowStep> GetStep(const std::string& pluginId) const = 0;
+};
+
+}  // namespace sdl3cpp::services
diff --git a/src/services/interfaces/workflow_context.hpp b/src/services/interfaces/workflow_context.hpp
new file mode 100644
index 0000000..37441a2
--- /dev/null
+++ b/src/services/interfaces/workflow_context.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <any>
+#include <string>
+#include <unordered_map>
+
+namespace sdl3cpp::services {
+
+class WorkflowContext {
+public:
+    template <typename T>
+    void Set(const std::string& key, T value) {
+        values_[key] = std::move(value);
+    }
+
+    bool Contains(const std::string& key) const {
+        return values_.find(key) != values_.end();
+    }
+
+    template <typename T>
+    const T* TryGet(const std::string& key) const {
+        auto it = values_.find(key);
+        if (it == values_.end()) {
+            return nullptr;
+        }
+        return std::any_cast<T>(&it->second);
+    }
+
+private:
+    std::unordered_map<std::string, std::any> values_;
+};
+
+}  // namespace sdl3cpp::services
diff --git a/src/services/interfaces/workflow_definition.hpp b/src/services/interfaces/workflow_definition.hpp
new file mode 100644
index 0000000..fe03ed4
--- /dev/null
+++ b/src/services/interfaces/workflow_definition.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "workflow_step_definition.hpp"
+
+#include <string>
+#include <vector>
+
+namespace sdl3cpp::services {
+
+struct WorkflowDefinition {
+    std::string templateName;
+    std::vector<WorkflowStepDefinition> steps;
+};
+
+}  // namespace sdl3cpp::services
diff --git a/src/services/interfaces/workflow_step_definition.hpp b/src/services/interfaces/workflow_step_definition.hpp
new file mode 100644
index 0000000..e9c253a
--- /dev/null
+++ b/src/services/interfaces/workflow_step_definition.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+namespace sdl3cpp::services {
+
+struct WorkflowStepDefinition {
+    std::string id;
+    std::string plugin;
+    std::unordered_map<std::string, std::string> inputs;
+    std::unordered_map<std::string, std::string> outputs;
+};
+
+}  // namespace sdl3cpp::services