diff --git a/src/include/gridfire/engine/types/engine_types.h b/src/include/gridfire/engine/types/engine_types.h
index 407b5965..80e50aa0 100644
--- a/src/include/gridfire/engine/types/engine_types.h
+++ b/src/include/gridfire/engine/types/engine_types.h
@@ -1,4 +1,33 @@
 #pragma once
 
 #include "gridfire/engine/types/building.h"
-#include "gridfire/engine/types/reporting.h"
\ No newline at end of file
+#include "gridfire/engine/types/reporting.h"
+
+namespace gridfire {
+    enum class EngineTypes {
+        GRAPH_ENGINE,
+        ADAPTIVE_ENGINE_VIEW,
+        MULTISCALE_PARTITIONING_ENGINE_VIEW,
+        PRIMING_ENGINE_VIEW,
+        DEFINED_ENGINE_VIEW,
+        FILE_DEFINED_ENGINE_VIEW
+    };
+
+    inline std::string engine_type_to_string(const EngineTypes type) {
+        switch (type) {
+            case EngineTypes::GRAPH_ENGINE:
+                return "GraphEngine";
+            case EngineTypes::ADAPTIVE_ENGINE_VIEW:
+                return "AdaptiveEngineView";
+            case EngineTypes::MULTISCALE_PARTITIONING_ENGINE_VIEW:
+                return "MultiscalePartitioningEngineView";
+            case EngineTypes::PRIMING_ENGINE_VIEW:
+                return "PrimingEngineView";
+            case EngineTypes::DEFINED_ENGINE_VIEW:
+                return "DefinedEngineView";
+            case EngineTypes::FILE_DEFINED_ENGINE_VIEW:
+                return "FileDefinedEngineView";
+        }
+        return "UnknownEngineType";
+    }
+}
\ No newline at end of file
diff --git a/src/include/gridfire/policy/policy_abstract.h b/src/include/gridfire/policy/policy_abstract.h
index bcea9ec7..cb1189be 100644
--- a/src/include/gridfire/policy/policy_abstract.h
+++ b/src/include/gridfire/policy/policy_abstract.h
@@ -24,10 +24,13 @@
 #include "fourdst/atomic/atomicSpecies.h"
 #include "gridfire/reaction/reaction.h"
 #include "gridfire/engine/engine_abstract.h"
+#include "gridfire/partition/partition.h"
 
 #include <string>
 #include <set>
 
+#include "gridfire/engine/types/engine_types.h"
+
 
 namespace gridfire::policy {
     /**
@@ -157,6 +160,12 @@ namespace gridfire::policy {
          * @endcode
          */
         [[nodiscard]] virtual NetworkPolicyStatus getStatus() const = 0;
+
+        [[nodiscard]] virtual const std::vector<std::unique_ptr<DynamicEngine>> &get_engine_stack() const = 0;
+
+        [[nodiscard]] virtual std::vector<EngineTypes> get_engine_types_stack() const = 0;
+
+        [[nodiscard]] virtual const std::unique_ptr<partition::PartitionFunction>& get_partition_function() const = 0;
     };
 
     /**
diff --git a/src/include/gridfire/policy/stellar_policy.h b/src/include/gridfire/policy/stellar_policy.h
index 4905828c..884f1d1f 100644
--- a/src/include/gridfire/policy/stellar_policy.h
+++ b/src/include/gridfire/policy/stellar_policy.h
@@ -142,6 +142,12 @@ namespace gridfire::policy {
          * @return NetworkPolicyStatus The construction and verification status.
          */
         [[nodiscard]] NetworkPolicyStatus getStatus() const override;
+
+        [[nodiscard]] const std::vector<std::unique_ptr<DynamicEngine>> &get_engine_stack() const override;
+
+        [[nodiscard]] std::vector<EngineTypes> get_engine_types_stack() const override;
+        [[nodiscard]] const std::unique_ptr<partition::PartitionFunction>& get_partition_function() const override;
+
     private:
         std::set<fourdst::atomic::Species> m_seed_species;
 
@@ -155,6 +161,8 @@ namespace gridfire::policy {
         static std::unique_ptr<partition::PartitionFunction> build_partition_function();
         [[nodiscard]] NetworkPolicyStatus check_status() const;
 
+    public:
+
     };
 
 
diff --git a/src/lib/policy/stellar_policy.cpp b/src/lib/policy/stellar_policy.cpp
index 7de7f959..f1bbd7e2 100644
--- a/src/lib/policy/stellar_policy.cpp
+++ b/src/lib/policy/stellar_policy.cpp
@@ -55,7 +55,6 @@ namespace gridfire::policy {
         );
 
         auto& graphRepr = dynamic_cast<GraphEngine&>(*m_network_stack.back().get());
-        // graphRepr.setPrecomputation(false);
         graphRepr.setUseReverseReactions(false);
 
 
@@ -97,6 +96,25 @@ namespace gridfire::policy {
         return m_status;
     }
 
+    const std::vector<std::unique_ptr<DynamicEngine>> &MainSequencePolicy::get_engine_stack() const {
+        if (m_status != NetworkPolicyStatus::INITIALIZED_VERIFIED) {
+            throw exceptions::PolicyError("Cannot get engine stack from MainSequencePolicy: Policy is not initialized and verified. Call construct() first.");
+        }
+        return m_network_stack;
+    }
+
+    std::vector<EngineTypes> MainSequencePolicy::get_engine_types_stack() const {
+        return {
+            EngineTypes::GRAPH_ENGINE,
+            EngineTypes::MULTISCALE_PARTITIONING_ENGINE_VIEW,
+            EngineTypes::ADAPTIVE_ENGINE_VIEW
+        };
+    }
+
+    const std::unique_ptr<partition::PartitionFunction>& MainSequencePolicy::get_partition_function() const {
+        return m_partition_function;
+    }
+
     inline NetworkPolicyStatus MainSequencePolicy::check_status() const {
         for (const auto& species : m_seed_species) {
             if (!m_initializing_composition.contains(species)) {
diff --git a/src/meson.build b/src/meson.build
index 176b78ba..1502bc97 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -9,6 +9,7 @@ gridfire_sources = files(
     'lib/engine/procedures/priming.cpp',
     'lib/engine/procedures/construction.cpp',
     'lib/engine/diagnostics/dynamic_engine_diagnostics.cpp',
+    'lib/engine/types/jacobian.cpp',
     'lib/reaction/reaction.cpp',
     'lib/reaction/reaclib.cpp',
     'lib/reaction/weak/weak.cpp',