diff --git a/README.md b/README.md
index 865cea6d..58877a71 100644
--- a/README.md
+++ b/README.md
@@ -128,11 +128,11 @@ Construct an engine and a schema validator once, then validate many templates:
 
 ```rust
 use cloudformation_validate::{
-    EngineConfig, RegoEngine, SchemaValidator, ValidateConfig, validate_bytes_with_path,
+    CompositeEngine, CompositeEngineConfig, SchemaValidator, ValidateConfig, validate_bytes_with_path,
 };
 
 let schema_validator = SchemaValidator::default();
-let engine = RegoEngine::new(EngineConfig::default())?;
+let engine = CompositeEngine::new(CompositeEngineConfig::default())?;
 
 let bytes = std::fs::read("template.yaml")?;
 let report = validate_bytes_with_path(
@@ -179,9 +179,9 @@ the content in `TemplateContent`, Python accepts `bytes` or a `TemplateContent`,
 ### Node.js [(bindings-wasm)](src/bindings-wasm/README.md)
 
 ```typescript
-import {RegoEngine, TemplateFile} from "@aws/cloudformation-validate";
+import {CompositeEngine, TemplateFile} from "@aws/cloudformation-validate";
 
-const engine = new RegoEngine();
+const engine = new CompositeEngine();
 const report = engine.validateTemplate(new TemplateFile("template.yaml"));
 for (const d of report.diagnostics) {
     console.log(`[${d.severity}] ${d.ruleId}: ${d.message}`);
@@ -192,9 +192,9 @@ engine.free();
 ### Python [(bindings-python)](src/bindings-python/README.md)
 
 ```python
-from cloudformation_validate import RegoEngine
+from cloudformation_validate import CompositeEngine
 
-engine = RegoEngine()
+engine = CompositeEngine()
 report = engine.validate_template("template.yaml")
 for d in report.diagnostics:
     print(f"[{d.severity.name}] {d.rule_id}: {d.message}")
@@ -205,7 +205,7 @@ for d in report.diagnostics:
 ```go
 import cfnvalidate "github.com/aws-cloudformation/cloudformation-validate/src/bindings-go/go"
 
-engine, err := cfnvalidate.NewRegoEngine(nil)
+engine, err := cfnvalidate.NewCompositeEngine(nil)
 if err != nil {
     log.Fatal(err)
 }
@@ -223,7 +223,7 @@ for _, d := range report.Diagnostics {
 import software.amazon.cloudformation.validate.*
 import java.io.File
 
-val engine = RegoEngine()
+val engine = CompositeEngine()
 val report = engine.validateTemplate(File("template.yaml"))
 for (d in report.diagnostics) {
     println("[${d.severity}] ${d.ruleId}: ${d.message}")
diff --git a/src/bindings-go/README.md b/src/bindings-go/README.md
index 1c0181d3..373b9b4f 100644
--- a/src/bindings-go/README.md
+++ b/src/bindings-go/README.md
@@ -35,7 +35,7 @@ MSVC.
 Engines, models, and validators hold off-heap memory - call `Destroy()` when done with each object:
 
 ```go
-engine, err := cfnvalidate.NewRegoEngine(nil)
+engine, err := cfnvalidate.NewCompositeEngine(nil)
 if err != nil {
     log.Fatal(err)
 }
diff --git a/src/bindings-jvm/README.md b/src/bindings-jvm/README.md
index 365bb638..9c7b6cfa 100644
--- a/src/bindings-jvm/README.md
+++ b/src/bindings-jvm/README.md
@@ -47,10 +47,10 @@ library).
 ## Quick start
 
 ```kotlin
-import software.amazon.cloudformation.validate.RegoEngine
+import software.amazon.cloudformation.validate.CompositeEngine
 import java.io.File
 
-val engine = RegoEngine()
+val engine = CompositeEngine()
 val report = engine.validateTemplate(File("template.yaml"))
 for (d in report.diagnostics) {
     println("[${d.severity}] ${d.ruleId}: ${d.message}")
@@ -352,10 +352,10 @@ constraint the API itself does not enforce - is skipped with a reason, never gue
 
 ```kotlin
 import software.amazon.cloudformation.validate.AwsCliCommand
-import software.amazon.cloudformation.validate.RegoEngine
+import software.amazon.cloudformation.validate.CompositeEngine
 import software.amazon.cloudformation.validate.engine.AwsCliCommandValidationStatus
 
-val engine = RegoEngine()
+val engine = CompositeEngine()
 val request = AwsCliCommand("s3", "CreateBucket", mapOf("Bucket" to "example-bucket"))
 val validation = engine.validateAwsCliCommand(request)
 if (validation.status == AwsCliCommandValidationStatus.VALIDATED) {
diff --git a/src/bindings-python/README.md b/src/bindings-python/README.md
index d225a9a2..1cc81607 100644
--- a/src/bindings-python/README.md
+++ b/src/bindings-python/README.md
@@ -26,9 +26,9 @@ only the artifact compatible with the installing host.
 ## Quick start
 
 ```python
-from cloudformation_validate import RegoEngine
+from cloudformation_validate import CompositeEngine
 
-engine = RegoEngine()
+engine = CompositeEngine()
 report = engine.validate_template("template.yaml")
 for d in report.diagnostics:
     print(f"[{d.severity.name}] {d.rule_id}: {d.message}")
@@ -329,9 +329,9 @@ exactly - an unregistered operation, a parameter without a lossless property map
 CloudFormation constraint the API itself does not enforce - is skipped with a reason, never guessed.
 
 ```python
-from cloudformation_validate import AwsCliCommand, AwsCliCommandValidationStatus, RegoEngine
+from cloudformation_validate import AwsCliCommand, AwsCliCommandValidationStatus, CompositeEngine
 
-engine = RegoEngine()
+engine = CompositeEngine()
 request = AwsCliCommand("s3", "CreateBucket", {"Bucket": "example-bucket"})
 validation = engine.validate_aws_cli_command(request)
 if validation.status == AwsCliCommandValidationStatus.VALIDATED:
diff --git a/src/bindings-rust/README.md b/src/bindings-rust/README.md
index eae0d077..a65fcc18 100644
--- a/src/bindings-rust/README.md
+++ b/src/bindings-rust/README.md
@@ -31,10 +31,12 @@ Requires Rust 1.96 or later (the repository pins that toolchain in [`rust-toolch
 ## Quick start
 
 ```rust
-use cloudformation_validate::{EngineConfig, RegoEngine, SchemaValidator, ValidateConfig, validate_bytes_with_path};
+use cloudformation_validate::{
+    CompositeEngine, CompositeEngineConfig, SchemaValidator, ValidateConfig, validate_bytes_with_path,
+};
 
 let schema_validator = SchemaValidator::default();
-let engine = RegoEngine::new(EngineConfig::default())?;
+let engine = CompositeEngine::new(CompositeEngineConfig::default())?;
 
 let template = std::fs::read("template.yaml").unwrap_or_else(|_| b"Resources: {}\n".to_vec());
 let report = validate_bytes_with_path(
@@ -231,11 +233,11 @@ defaults - `ValidateConfig::default()` uses them.
 
 ```rust,no_run
 use cloudformation_validate::{
-    EngineConfig, FilterConfig, RegoEngine, RuleFilterConfig, SchemaValidator, Severity, ValidateConfig,
+    CompositeEngine, CompositeEngineConfig, FilterConfig, RuleFilterConfig, SchemaValidator, Severity, ValidateConfig,
     validate_bytes_with_path,
 };
 
-let engine = RegoEngine::new(EngineConfig::default())?;
+let engine = CompositeEngine::new(CompositeEngineConfig::default())?;
 let schema_validator = SchemaValidator::default();
 let template = std::fs::read("template.yaml")?;
 let report = validate_bytes_with_path(
@@ -391,9 +393,9 @@ result types live in the `validation_engine` module.
 use cloudformation_validate::validation_engine::{
     AwsCliCommand, AwsCliCommandValidationStatus, AwsCliValue, validate_aws_cli_command,
 };
-use cloudformation_validate::{EngineConfig, RegoEngine, SchemaValidator};
+use cloudformation_validate::{CompositeEngine, CompositeEngineConfig, SchemaValidator};
 
-let engine = RegoEngine::new(EngineConfig::default())?;
+let engine = CompositeEngine::new(CompositeEngineConfig::default())?;
 let schema_validator = SchemaValidator::default();
 let request = AwsCliCommand::new(
     "s3",
diff --git a/src/bindings-wasm/README.md b/src/bindings-wasm/README.md
index bd2acfbc..245d5e2a 100644
--- a/src/bindings-wasm/README.md
+++ b/src/bindings-wasm/README.md
@@ -26,9 +26,9 @@ Requires Node.js 20 or later. The package has no runtime dependencies.
 Engines, models, and validators hold off-heap memory - call `.free()` when done with each object:
 
 ```typescript
-import { RegoEngine, TemplateFile } from "@aws/cloudformation-validate";
+import { CompositeEngine, TemplateFile } from "@aws/cloudformation-validate";
 
-const engine = new RegoEngine();
+const engine = new CompositeEngine();
 try {
     const report = engine.validateTemplate(new TemplateFile("template.yaml"));
     for (const d of report.diagnostics) {
@@ -346,9 +346,9 @@ an unregistered operation, a parameter without a lossless property mapping, or a
 constraint the API itself does not enforce - is skipped with a reason, never guessed.
 
 ```typescript
-import { AwsCliCommand, RegoEngine } from "@aws/cloudformation-validate";
+import { AwsCliCommand, CompositeEngine } from "@aws/cloudformation-validate";
 
-const engine = new RegoEngine();
+const engine = new CompositeEngine();
 try {
     const request = new AwsCliCommand("s3", "CreateBucket", { Bucket: "example-bucket" });
     const validation = engine.validateAwsCliCommand(request);