diff --git a/src/tests/inheritance_matching.rs b/src/tests/inheritance_matching.rs
new file mode 100644
index 0000000..1abb9f4
--- /dev/null
+++ b/src/tests/inheritance_matching.rs
@@ -0,0 +1,177 @@
+use crate::*;
+use serde_json::json;
+
+fn setup_dynamic_pointer_db() {
+  let db_json = json!({
+    "puncs": [],
+    "enums": [],
+    "relations": [],
+    "types": [
+      {
+        "name": "bid.evaluation_context",
+        "variations": ["bid.evaluation_context"],
+        "hierarchy": ["bid.evaluation_context", "entity"],
+        "schemas": {
+          "bid.evaluation_context": {
+            "type": "object",
+            "properties": {
+              "amount": { "type": "number" }
+            },
+            "required": ["amount"]
+          }
+        }
+      },
+      {
+        "name": "work_order.evaluation_context",
+        "variations": ["work_order.evaluation_context"],
+        "hierarchy": ["work_order.evaluation_context", "entity"],
+        "schemas": {
+          "work_order.evaluation_context": {
+            "type": "object",
+            "properties": {
+              "vendor_id": { "type": "string" }
+            },
+            "required": ["vendor_id"]
+          }
+        }
+      },
+      {
+        "name": "evaluation_rule",
+        "variations": ["evaluation_rule"],
+        "hierarchy": ["evaluation_rule", "entity"],
+        "schemas": {
+          "evaluation_rule": {
+            "type": "object",
+            "properties": {
+              "entity_type": { "type": "string" },
+              "evaluation_context": { "type": "$entity_type.evaluation_context" }
+            },
+            "required": ["entity_type", "evaluation_context"]
+          }
+        }
+      }
+    ]
+  });
+
+  let setup_res = jspg_setup(Json(db_json));
+  assert_eq!(
+    setup_res.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+}
+
+fn test_structural_inheritance_dynamic_pointer() {
+  setup_dynamic_pointer_db();
+
+  // 1. Happy path: entity_type = bid, evaluation_context matches bid.evaluation_context
+  let happy_bid = json!({
+    "entity_type": "bid",
+    "evaluation_context": {
+      "amount": 5000
+    }
+  });
+  let res_happy_bid = jspg_validate("evaluation_rule", JsonB(happy_bid));
+  assert_eq!(
+    res_happy_bid.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+
+  // 2. Happy path: entity_type = work_order, evaluation_context matches work_order.evaluation_context
+  let happy_wo = json!({
+    "entity_type": "work_order",
+    "evaluation_context": {
+      "vendor_id": "vendor-123"
+    }
+  });
+  let res_happy_wo = jspg_validate("evaluation_rule", JsonB(happy_wo));
+  assert_eq!(
+    res_happy_wo.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+
+  // 3. Unhappy path: entity_type = bid but evaluation_context has invalid schema (missing required field 'amount')
+  let unhappy_bid = json!({
+    "entity_type": "bid",
+    "evaluation_context": {
+      "vendor_id": "vendor-123"
+    }
+  });
+  let res_unhappy_bid = jspg_validate("evaluation_rule", JsonB(unhappy_bid));
+  assert_eq!(
+    res_unhappy_bid.0,
+    json!({
+      "type": "drop",
+      "errors": [
+        {
+          "code": "REQUIRED_FIELD_MISSING",
+          "message": "Missing amount",
+          "details": { "path": "evaluation_context/amount" }
+        },
+        {
+          "code": "STRICT_PROPERTY_VIOLATION",
+          "message": "Unexpected property 'vendor_id'",
+          "details": { "path": "evaluation_context/vendor_id" }
+        }
+      ]
+    })
+  );
+
+  // 4. Missing discriminator: dynamic pointer cannot resolve property 'entity_type'
+  let missing_disc = json!({
+    "evaluation_context": {}
+  });
+  let res_missing_disc = jspg_validate("evaluation_rule", JsonB(missing_disc));
+  assert_eq!(
+    res_missing_disc.0,
+    json!({
+      "type": "drop",
+      "errors": [
+        {
+          "code": "REQUIRED_FIELD_MISSING",
+          "message": "Missing entity_type",
+          "details": { "path": "entity_type" }
+        },
+        {
+          "code": "DYNAMIC_TYPE_RESOLUTION_FAILED",
+          "message": "Dynamic type pointer '$entity_type.evaluation_context' could not resolve discriminator property 'entity_type' on parent instance",
+          "details": { "path": "evaluation_context" }
+        }
+      ]
+    })
+  );
+
+  // 5. Unregistered discriminator: target not found in registry
+  let unknown_disc = json!({
+    "entity_type": "unknown",
+    "evaluation_context": {}
+  });
+  let res_unknown_disc = jspg_validate("evaluation_rule", JsonB(unknown_disc));
+  assert_eq!(
+    res_unknown_disc.0,
+    json!({
+      "type": "drop",
+      "errors": [
+        {
+          "code": "DYNAMIC_TYPE_RESOLUTION_FAILED",
+          "message": "Resolved dynamic type pointer 'unknown.evaluation_context' was not found in schema registry",
+          "details": { "path": "evaluation_context" }
+        }
+      ]
+    })
+  );
+
+  let _ = jspg_teardown();
+}
+
+pub fn run_all() {
+  test_structural_inheritance_dynamic_pointer();
+}
diff --git a/src/tests/inline_validator.rs b/src/tests/inline_validator.rs
new file mode 100644
index 0000000..2e3c55c
--- /dev/null
+++ b/src/tests/inline_validator.rs
@@ -0,0 +1,124 @@
+use crate::*;
+use serde_json::json;
+
+fn setup_simple_db() {
+  let db_json = json!({
+    "puncs": [],
+    "enums": [],
+    "relations": [],
+    "types": [
+      {
+        "name": "person",
+        "variations": ["person"],
+        "hierarchy": ["person", "entity"],
+        "schemas": {
+          "person": {
+            "type": "object",
+            "properties": {
+              "type": { "type": "string" },
+              "name": { "type": "string" }
+            },
+            "required": ["name"]
+          }
+        }
+      }
+    ]
+  });
+  let setup_res = jspg_setup(Json(db_json));
+  assert_eq!(
+    setup_res.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+}
+
+fn test_inline_schema_happy_path() {
+  // 1. Valid instance matching the inline schema
+  let inline_schema = r#"{"type": "object", "properties": {"age": {"type": "number"}}, "required": ["age"]}"#;
+  let happy_res = jspg_validate(inline_schema, JsonB(json!({"age": 42})));
+  assert_eq!(
+    happy_res.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+
+  // 2. Invalid instance failing the inline schema (missing required field)
+  let unhappy_res = jspg_validate(inline_schema, JsonB(json!({"name": "Neo"})));
+  assert_eq!(
+    unhappy_res.0,
+    json!({
+      "type": "drop",
+      "errors": [
+        {
+          "code": "REQUIRED_FIELD_MISSING",
+          "message": "Missing age",
+          "details": { "path": "age" }
+        },
+        {
+          "code": "STRICT_PROPERTY_VIOLATION",
+          "message": "Unexpected property 'name'",
+          "details": { "path": "name" }
+        }
+      ]
+    })
+  );
+
+  // 3. Inline schema referencing registered custom type "person"
+  let inline_with_ref = r#"{"type": "object", "properties": {"who": {"type": "person"}}, "required": ["who"]}"#;
+  let happy_ref_res = jspg_validate(inline_with_ref, JsonB(json!({"who": {"type": "person", "name": "Morpheus"}})));
+  assert_eq!(
+    happy_ref_res.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+
+  let unhappy_ref_res = jspg_validate(inline_with_ref, JsonB(json!({"who": {"type": "person"}})));
+  assert_eq!(
+    unhappy_ref_res.0,
+    json!({
+      "type": "drop",
+      "errors": [
+        {
+          "code": "REQUIRED_FIELD_MISSING",
+          "message": "Missing name",
+          "details": { "path": "who/name" }
+        }
+      ]
+    })
+  );
+}
+
+fn test_inline_schema_syntax_errors() {
+  let malformed_schema = r#"{"type": "object", "properties": {"name": {"type": "#;
+  let res = jspg_validate(malformed_schema, JsonB(json!({})));
+  
+  let errors = res.0.get("errors").expect("Expected errors block");
+  let err = errors.get(0).expect("Expected at least one error");
+  assert_eq!(err.get("code").unwrap().as_str().unwrap(), "SCHEMA_PARSE_FAILED");
+  assert!(err.get("message").unwrap().as_str().unwrap().contains("Failed to parse inline schema"));
+}
+
+fn test_inline_schema_ref_compilation_errors() {
+  // Try to use a custom type that is not defined in the compiled database context.
+  let invalid_ref_schema = r#"{"type": "object", "properties": {"item": {"type": "non_existent_type"}}}"#;
+  let res = jspg_validate(invalid_ref_schema, JsonB(json!({"item": {}})));
+
+  let errors = res.0.get("errors").expect("Expected errors block");
+  let err = errors.get(0).expect("Expected compilation error");
+  assert_eq!(err.get("code").unwrap().as_str().unwrap(), "PROXY_TYPE_RESOLUTION_FAILED");
+  assert!(err.get("message").unwrap().as_str().unwrap().contains("non_existent_type"));
+}
+
+pub fn run_all() {
+  setup_simple_db();
+  test_inline_schema_happy_path();
+  test_inline_schema_syntax_errors();
+  test_inline_schema_ref_compilation_errors();
+  let _ = jspg_teardown();
+}
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
index a02c0a3..f6e7737 100644
--- a/src/tests/mod.rs
+++ b/src/tests/mod.rs
@@ -2,12 +2,28 @@ use crate::*;
 pub mod formatter;
 pub mod runner;
 pub mod types;
+pub mod inline_validator;
+pub mod swap_concurrency;
+pub mod inheritance_matching;
 use serde_json::json;
 
+lazy_static::lazy_static! {
+  pub static ref TEST_MUTEX: std::sync::Mutex<()> = std::sync::Mutex::new(());
+}
+
 // Database module tests moved to src/database/executors/mock.rs
 
+#[test]
+fn test_jspg_custom_audit_suite() {
+  let _guard = TEST_MUTEX.lock().unwrap();
+  inline_validator::run_all();
+  inheritance_matching::run_all();
+  swap_concurrency::run_all();
+}
+
 #[test]
 fn test_library_api() {
+  let _guard = TEST_MUTEX.lock().unwrap();
   // 1. Initially, schemas are not cached.
 
   // Expected uninitialized drop format: errors + null response
diff --git a/src/tests/swap_concurrency.rs b/src/tests/swap_concurrency.rs
new file mode 100644
index 0000000..79d675c
--- /dev/null
+++ b/src/tests/swap_concurrency.rs
@@ -0,0 +1,91 @@
+use crate::*;
+use serde_json::json;
+use std::thread;
+use std::sync::Arc;
+
+fn get_concurrency_db() -> serde_json::Value {
+  json!({
+    "puncs": [],
+    "enums": [],
+    "relations": [],
+    "types": [
+      {
+        "name": "person",
+        "variations": ["person"],
+        "hierarchy": ["person", "entity"],
+        "schemas": {
+          "person": {
+            "type": "object",
+            "properties": {
+              "type": { "type": "string" },
+              "name": { "type": "string" }
+            },
+            "required": ["name"]
+          }
+        }
+      }
+    ]
+  })
+}
+
+fn test_concurrent_atomic_swap_isolation() {
+  // 1. Initialize first
+  let db_json = get_concurrency_db();
+  let setup_res = jspg_setup(Json(db_json.clone()));
+  assert_eq!(
+    setup_res.0,
+    json!({
+      "type": "drop",
+      "response": "success"
+    })
+  );
+
+  // 2. Spawn 8 parallel reader threads validating schemas
+  let num_readers = 8;
+  let mut handles = Vec::new();
+
+  for i in 0..num_readers {
+    handles.push(thread::spawn(move || {
+      let payload = json!({"type": "person", "name": format!("Neo-{}", i)});
+      for _ in 0..100 {
+        let res = jspg_validate("person", JsonB(payload.clone()));
+        // The validation either succeeds or returns ENGINE_NOT_INITIALIZED (if teardown just swapped it)
+        // BUT it must NEVER panic, deadlock, or return corrupt memory!
+        let val = res.0;
+        let is_success = val.get("response").and_then(|r| r.as_str()) == Some("success");
+        let is_uninit = val.get("errors")
+          .and_then(|e| e.as_array())
+          .and_then(|arr| arr.get(0))
+          .and_then(|err| err.get("code"))
+          .and_then(|c| c.as_str()) == Some("ENGINE_NOT_INITIALIZED");
+
+        assert!(is_success || is_uninit, "Unexpected validation response: {:?}", val);
+        thread::yield_now();
+      }
+    }));
+  }
+
+  // 3. Spawn a concurrent writer thread constantly calling setup and teardown
+  let db_json_shared = Arc::new(db_json);
+  let writer_handle = thread::spawn(move || {
+    for _ in 0..50 {
+      let _ = jspg_teardown();
+      thread::yield_now();
+      let _ = jspg_setup(Json((*db_json_shared).clone()));
+      thread::yield_now();
+    }
+  });
+
+  // 4. Join everyone and verify no thread panicked
+  for handle in handles {
+    handle.join().expect("Reader thread panicked or deadlocked!");
+  }
+  writer_handle.join().expect("Writer thread panicked or deadlocked!");
+
+  // Clean up
+  let _ = jspg_teardown();
+}
+
+pub fn run_all() {
+  test_concurrent_atomic_swap_isolation();
+}