diff --git a/docs/contracts/engine-bridge-v2.md b/docs/contracts/engine-bridge-v2.md
new file mode 100644
index 0000000..ccb5485
--- /dev/null
+++ b/docs/contracts/engine-bridge-v2.md
@@ -0,0 +1,75 @@
+# Sprint Contract — engine-bridge v2 (MEF plugin masquerade)
+
+**Owner:** Generator
+**Depends on:** engine-bridge v1 (완료)
+**Issue:** #10
+
+## Goal
+
+`engine-bridge` v1 probe design 문서가 권고한 **MEF plugin masquerade** 경로를 구현한다. recordingtest 전용 플러그인을 빌드해 `EG-BIM Modeler/Plugins/`에 drop-in하면, SUT가 로드할 때 플러그인이 로컬 HTTP 서버를 띄워 HmEG 상태(선택/카메라/씬/렌더)를 JSON으로 노출한다. recordingtest-side 클라이언트는 HTTP로 상태를 조회한다.
+
+PoC 범위: 플러그인 + 클라이언트 빌드 + 엔드투엔드 HTTP 테스트 (가짜 엔진 상태 주입). **SUT 실제 실행은 수동 smoke test 단계에서.**
+
+## Definition of Done
+
+- [ ] `src/Recordingtest.EgPlugin/` — MEF plugin dll
+  - Target: `net8.0-windows`
+  - `Editor03.PluginInterface.dll`을 `HintPath`로 참조 (Private=false, SUT의 정본 복사 금지)
+  - `Editor03.PluginInterface.dll`의 **실제 계약을 MetadataLoadContext로 분석**해서 구현할 최소 interface/attribute를 확인 (Generator가 discovery 수행)
+  - 플러그인 로드 시점에 `HttpListener`로 `http://localhost:{port}/` 시작 (기본 포트 `38080`, 환경변수 `RECORDINGTEST_BRIDGE_PORT`로 override)
+  - 엔드포인트: `/selection`, `/camera`, `/scene`, `/render`, `/health`
+  - 각 엔드포인트는 `IEngineStateProvider` 인터페이스로부터 JSON을 반환
+  - 기본 `ReflectionEngineStateProvider`는 HmEG 내부 타입을 리플렉션으로 찾아 상태를 구성 (실패해도 예외 삼킴 — `{error: "..."}` 반환)
+  - 플러그인 unload 시 HttpListener 정리
+- [ ] `src/Recordingtest.EngineBridge.Client/` — HTTP 클라이언트 라이브러리
+  - `HmEgHttpSnapshot : IEngineSnapshot` 구현 (v1 인터페이스 재사용)
+  - `HttpClient`로 엔드포인트 호출, 타임아웃 기본 2초
+  - 각 속성은 on-demand HTTP GET (caching 없음 v2)
+  - `IsRenderComplete`는 `/render` 응답의 `complete` 필드
+- [ ] `tests/Recordingtest.EngineBridge.IntegrationTests/` — xUnit
+  - **fake HTTP 서버**: `HttpListener`를 테스트 안에서 띄우고 고정 JSON 응답
+  - 테스트 ≥ 6:
+    1. `Client_SelectionEndpoint_ReturnsIds`
+    2. `Client_CameraEndpoint_ReturnsCameraState`
+    3. `Client_SceneEndpoint_ReturnsSceneSummary`
+    4. `Client_RenderEndpoint_ReturnsIsComplete`
+    5. `Client_HealthEndpoint_ReturnsOk`
+    6. `Client_Timeout_ThrowsOrReturnsError` (2초 이내 미응답 시)
+- [ ] `src/Recordingtest.EgPlugin` 단위 테스트 ≥ 3 (플러그인 로직)
+  - 테스트에서 **실제 plugin dll을 SUT에 주입하지 않음**. 순수 로직만.
+  - `StateRouter_SerializesSelection_ToJson`
+  - `StateRouter_WithFaultyProvider_ReturnsErrorPayload`
+  - `PortResolver_PrefersEnvVar` (`RECORDINGTEST_BRIDGE_PORT`)
+- [ ] `docs/guides/engine-bridge-deploy.md` — 수동 배포 가이드 (SUT Plugins/ 폴더에 dll 복사, 환경변수 설정, 검증 절차)
+- [ ] `dotnet build` + `dotnet test` 전부 green
+- [ ] 플러그인이 SUT 자체 파일을 건드리지 않음 (guard hook 준수)
+
+## Out of scope
+
+- SUT 실제 실행 (수동 smoke test)
+- 인증/암호화 (PoC는 localhost only)
+- 멀티클라이언트 / 동시성 (단일 HttpListener)
+- HmEG 리플렉션 매핑 완성도 — v2는 skeleton + error fallback 중심, 진짜 매핑은 smoke test 후 조정
+
+## Interfaces
+
+- **Inputs:** SUT가 plugin을 로드할 때의 MEF 계약
+- **Outputs:** `http://localhost:<port>/{selection|camera|scene|render|health}` JSON
+- **Side effects:** HttpListener 포트 점유 (플러그인 생명주기 내)
+
+## Evaluation plan
+
+1. `dotnet build recordingtest.sln` green
+2. `dotnet test tests/Recordingtest.EngineBridge.IntegrationTests` — 6 pass
+3. `dotnet test tests/Recordingtest.EgPlugin.Tests` — 3 pass
+4. `Recordingtest.EgPlugin.dll` 출력 확인, `Editor03.PluginInterface`에 대한 HintPath/Private=false 확인 (csproj 리뷰)
+5. Generator가 Editor03.PluginInterface.dll 메타데이터에서 발견한 실제 인터페이스 이름을 history에 기록했는지 확인
+6. `docs/guides/engine-bridge-deploy.md` 존재 + 배포 단계(복사·환경변수·검증) 기술
+7. SUT 폴더에 쓰기 흔적 없음 (grep)
+8. Plugin 코드가 `HttpListener` 예외 상황(port 충돌, stop) 처리
+
+## Risks
+
+- `Editor03.PluginInterface`가 WPF dependency를 가지면 net8.0-windows로 충분하지 않을 수 있음 — 필요 시 TFM 조정
+- 플러그인 dll이 SUT와 같은 디렉터리의 다른 dll 버전과 충돌 가능 — Private=false 필수
+- HmEG 리플렉션 실제 매핑은 SUT 런타임에서만 검증 가능 → v2는 error fallback 철저
diff --git a/docs/guides/engine-bridge-deploy.md b/docs/guides/engine-bridge-deploy.md
new file mode 100644
index 0000000..14dba8a
--- /dev/null
+++ b/docs/guides/engine-bridge-deploy.md
@@ -0,0 +1,97 @@
+# engine-bridge v2 Deployment Guide
+
+This guide explains how to deploy `Recordingtest.EgPlugin.dll` into the SUT
+(`EG-BIM Modeler`) so the recordingtest harness can read live HmEG state over
+HTTP. Issue #10.
+
+## 1. Build
+
+```
+dotnet publish src/Recordingtest.EgPlugin -c Release
+```
+
+Output: `src/Recordingtest.EgPlugin/bin/Release/net8.0-windows/publish/`
+- `Recordingtest.EgPlugin.dll`
+- `Recordingtest.EgPlugin.deps.json`
+- `Recordingtest.EgPlugin.pdb`
+
+`Editor03.PluginInterface.dll` and `HmEG.dll` are referenced with
+`<Private>false</Private>`, so the plugin output **does not** include copies
+of the SUT contracts. The plugin will bind to whatever the SUT loads at
+runtime.
+
+## 2. Copy into SUT Plugins folder
+
+> **Important:** writing into `EG-BIM Modeler/` is normally blocked by the
+> repo guard hook. Ask the operator before performing the copy step. The
+> copy is intentionally a manual operation.
+
+Create a per-plugin folder under `EG-BIM Modeler/Plugins/` and copy the
+publish output:
+
+```
+mkdir "EG-BIM Modeler\Plugins\Recordingtest.EgPlugin"
+copy src\Recordingtest.EgPlugin\bin\Release\net8.0-windows\publish\Recordingtest.EgPlugin.dll "EG-BIM Modeler\Plugins\Recordingtest.EgPlugin\"
+copy src\Recordingtest.EgPlugin\bin\Release\net8.0-windows\publish\Recordingtest.EgPlugin.deps.json "EG-BIM Modeler\Plugins\Recordingtest.EgPlugin\"
+```
+
+`runtimeconfig.json` is not produced for class library projects; the SUT
+hosts the CLR. If a future change makes the plugin executable, also copy
+`Recordingtest.EgPlugin.runtimeconfig.json`.
+
+## 3. Configure environment (optional)
+
+The plugin listens on `http://localhost:38080/` by default. Override with:
+
+```
+set RECORDINGTEST_BRIDGE_PORT=38090
+```
+
+The variable is read once at plugin construction.
+
+## 4. Launch SUT
+
+Start `EG-BIM Modeler.exe` normally. The SUT's `HmEG.PluginLoader` walks
+`Plugins/` at startup and loads any DLL whose type derives from
+`HmEG.IPlugin` (our plugin inherits `Editor.PluginInterface.EditorPlugin`,
+which implements `IPlugin`).
+
+## 5. Verify
+
+```
+curl http://localhost:38080/health
+```
+
+Expected:
+
+```
+{"status":"ok","port":38080}
+```
+
+Other endpoints:
+
+- `GET /selection` -> `{"selected_ids":[...]}`
+- `GET /camera`    -> `{"eye":[..],"target":[..],"up":[..],"fov":n}`
+- `GET /scene`     -> `{"object_count":n,"document_path":"..."}`
+- `GET /render`    -> `{"complete":true|false}`
+
+The recordingtest client (`HmEgHttpSnapshot`) is the supported consumer.
+
+## 6. Troubleshooting
+
+| Symptom | Likely cause | Fix |
+|---|---|---|
+| `curl` connection refused | port already in use OR plugin failed to load | check SUT log under `EG-BIM Modeler/hmlogs/`, set a different `RECORDINGTEST_BRIDGE_PORT` |
+| `Could not load file or assembly Editor03.PluginInterface` | Wrong contract version dropped next to plugin | delete any local copy of `Editor03.PluginInterface.dll` from the plugin folder; the SUT must resolve it from its own folder |
+| Plugin loaded but `/health` 404 | SUT started a different `Plugins/Recordingtest.EgPlugin/` build | clean the folder and re-copy publish output |
+| `HttpListener` access denied (Windows) | URL ACL not registered | run SUT elevated once, or `netsh http add urlacl url=http://localhost:38080/ user=Everyone` |
+
+SUT log location: `EG-BIM Modeler/hmlogs/` (Serilog rolling files).
+
+## 7. Uninstall
+
+```
+rmdir /s /q "EG-BIM Modeler\Plugins\Recordingtest.EgPlugin"
+```
+
+No registry, no services, no env vars beyond optional `RECORDINGTEST_BRIDGE_PORT`.
diff --git a/docs/history/2026-04-07_이슈10-engine-bridge-v2-generator.md b/docs/history/2026-04-07_이슈10-engine-bridge-v2-generator.md
new file mode 100644
index 0000000..9ff5be9
--- /dev/null
+++ b/docs/history/2026-04-07_이슈10-engine-bridge-v2-generator.md
@@ -0,0 +1,78 @@
+# 2026-04-07 — Issue #10 engine-bridge v2 Generator
+
+- 역할: Generator
+- 계약: `docs/contracts/engine-bridge-v2.md`
+- 소요 시간: 약 35분 (단일 세션)
+- Context 사용량: 약 95k tokens (대용량 sln/.cs 디렉터리 스캔 + MetadataLoadContext 출력)
+
+## Editor03 / HmEG 디스커버리 결과
+
+`MetadataLoadContext`로 `EG-BIM Modeler/Editor03.PluginInterface.dll`,
+`Editor07.WidgetPluginInterface.dll`, `HmEG.dll`, `Plugins/EgBoxPlugin/EgBoxPlugin.dll`을
+메타데이터 전용으로 열어 다음을 확인했다:
+
+- **실제 plugin 컨트랙트는 `HmEG.IPlugin`** (HmEG.dll). Members:
+  `string Name { get; }`, `EGViewport View { get; set; }`,
+  `bool RethrowException { get; set; }`, `object Run(object[])`.
+- **MEF Export 어트리뷰트는 사용되지 않는다.** 로딩은 `HmEG.PluginLoader`
+  (`LoadProjectPlugins`/`LoadPlugin(path,name)`)가 직접 수행한다.
+  `EgBoxPlugin.EgBoxPlugin` 샘플도 `[Export]` 없이 단순히
+  `Editor.PluginInterface.EditorPlugin`을 상속한다.
+- **`Editor.PluginInterface.EditorPlugin`** (Editor03.PluginInterface.dll)
+  은 `HmEG.IPlugin`을 구현하는 추상 base다.
+  abstract 멤버: `Name { get; }`, `Description { get; }`,
+  `protected void Initialize()`. 그 외 `AppManager`, `RootSpace`,
+  `ViewportManager`, `View`, `AddModelToRootSpace(...)` 등의 헬퍼를 노출한다.
+- **`Editor07.WidgetPluginInterface`** 는 위젯 전용(`WidzetPlugin`,
+  `HmEG_DebugWidzetPlugin`)이며 v2 범위 밖이라 미사용.
+
+→ 결론: `HmEgBridgePlugin : Editor.PluginInterface.EditorPlugin` 으로
+구현. `Name`/`Description` override + `protected override Initialize()`,
+HTTP listener는 생성자에서 안전하게 부팅 (`Initialize`가 호출되지 않더라도
+listener는 살아있음).
+
+### 디스커버리 시 주의사항
+
+- MetadataLoadContext에 `Microsoft.NETCore.App` 런타임 디렉터리만 넣으면
+  `WindowsBase`의 `System.Windows.Markup.InternalTypeHelper`를 못 찾아
+  `TypeLoadException`이 난다. **WindowsDesktop ref pack
+  (`packs/Microsoft.WindowsDesktop.App.Ref/8.0.22/ref/net8.0`)** 도 함께
+  resolver에 등록해야 한다. 동일 파일명은 dedupe 필요.
+- 같은 이유로 `Editor03.PluginInterface`는 `<UseWPF>true</UseWPF>`인
+  net8.0-windows 프로젝트에서만 빌드된다.
+
+## 산출물
+
+- `src/Recordingtest.EgPlugin/` (PortResolver, IEngineStateProvider,
+  Null/ReflectionEngineStateProvider, StateRouter, BridgeHttpServer,
+  HmEgBridgePlugin)
+- `src/Recordingtest.EngineBridge.Client/` (HmEgHttpSnapshot,
+  EngineBridgeException)
+- `tests/Recordingtest.EngineBridge.IntegrationTests/` (FakeBridgeServer +
+  6 xUnit tests)
+- `tests/Recordingtest.EgPlugin.Tests/` (5 xUnit tests for StateRouter +
+  PortResolver)
+- `docs/guides/engine-bridge-deploy.md`
+
+## 빌드 / 테스트 결과
+
+- `dotnet build recordingtest.sln` → green (warning 0, error 0)
+- `dotnet test tests/Recordingtest.EngineBridge.IntegrationTests` → 6/6 통과
+- `dotnet test tests/Recordingtest.EgPlugin.Tests` → 5/5 통과
+- 신규 프로젝트 4개를 `recordingtest.sln`에 추가
+- `EG-BIM Modeler/` 폴더에는 일체 쓰지 않음 (가드 훅 준수). 배포는 가이드
+  문서로만 기술.
+
+## 리스크 / 후속
+
+- `ReflectionEngineStateProvider`는 v2 skeleton: 모든 메서드가 안전한
+  default를 반환한다. **HmEG 내부 타입(특히 `HmEGAppManager`,
+  `EGViewport`, 선택/카메라 manager)에 대한 진짜 reflection 매핑은 v3에서
+  smoke test 후 확정해야 한다.** 후보 멤버는
+  `docs/engine-catalog/hmeg-candidates.json` 참고.
+- `HttpListener` urlacl이 등록 안 된 환경에서는 첫 실행에 관리자 권한 또는
+  `netsh http add urlacl` 필요 — 가이드에 명시.
+- `Editor.PluginInterface.EditorPlugin.Initialize()`가 protected이고
+  HmEG.PluginLoader가 어느 시점에 호출하는지는 메타데이터로 확인 불가
+  (런타임 동작). 그래서 listener를 생성자에서 부팅했다. PluginLoader가
+  생성자 호출만으로 충분한지는 smoke test에서 확인 필요.
diff --git a/recordingtest.sln b/recordingtest.sln
index 089886b..ea89653 100644
--- a/recordingtest.sln
+++ b/recordingtest.sln
@@ -33,6 +33,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EngineBridge.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EngineBridge.Tests", "tests\Recordingtest.EngineBridge.Tests\Recordingtest.EngineBridge.Tests.csproj", "{0811AC32-E2A4-4BFD-A29A-6451F5756F10}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EgPlugin", "src\Recordingtest.EgPlugin\Recordingtest.EgPlugin.csproj", "{51D7B803-5F6E-4B78-9A5D-326F28CD934F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EngineBridge.Client", "src\Recordingtest.EngineBridge.Client\Recordingtest.EngineBridge.Client.csproj", "{45D80D0C-A8A1-4173-B28C-68F0628EE346}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EngineBridge.IntegrationTests", "tests\Recordingtest.EngineBridge.IntegrationTests\Recordingtest.EngineBridge.IntegrationTests.csproj", "{BA346F72-6F9C-4D68-9CDD-DD05F9687095}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Recordingtest.EgPlugin.Tests", "tests\Recordingtest.EgPlugin.Tests\Recordingtest.EgPlugin.Tests.csproj", "{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -223,6 +231,54 @@ Global
 		{0811AC32-E2A4-4BFD-A29A-6451F5756F10}.Release|x64.Build.0 = Release|Any CPU
 		{0811AC32-E2A4-4BFD-A29A-6451F5756F10}.Release|x86.ActiveCfg = Release|Any CPU
 		{0811AC32-E2A4-4BFD-A29A-6451F5756F10}.Release|x86.Build.0 = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|x64.Build.0 = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Debug|x86.Build.0 = Debug|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|x64.ActiveCfg = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|x64.Build.0 = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|x86.ActiveCfg = Release|Any CPU
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F}.Release|x86.Build.0 = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|x64.Build.0 = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Debug|x86.Build.0 = Debug|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|Any CPU.Build.0 = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|x64.ActiveCfg = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|x64.Build.0 = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|x86.ActiveCfg = Release|Any CPU
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346}.Release|x86.Build.0 = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|x64.Build.0 = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Debug|x86.Build.0 = Debug|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|x64.ActiveCfg = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|x64.Build.0 = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|x86.ActiveCfg = Release|Any CPU
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095}.Release|x86.Build.0 = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|x64.Build.0 = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Debug|x86.Build.0 = Debug|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|x64.ActiveCfg = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|x64.Build.0 = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|x86.ActiveCfg = Release|Any CPU
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -242,5 +298,9 @@ Global
 		{938D464B-B810-425F-83B6-52877B584DE2} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
 		{B1EAD466-9C07-4C07-907C-3D5794F6689D} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
 		{0811AC32-E2A4-4BFD-A29A-6451F5756F10} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
+		{51D7B803-5F6E-4B78-9A5D-326F28CD934F} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
+		{45D80D0C-A8A1-4173-B28C-68F0628EE346} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
+		{BA346F72-6F9C-4D68-9CDD-DD05F9687095} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
+		{315F3B4F-BF8F-4DBF-8F06-CAF55152725D} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
 	EndGlobalSection
 EndGlobal
diff --git a/src/Recordingtest.EgPlugin/BridgeHttpServer.cs b/src/Recordingtest.EgPlugin/BridgeHttpServer.cs
new file mode 100644
index 0000000..423fba6
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/BridgeHttpServer.cs
@@ -0,0 +1,66 @@
+using System.Net;
+using System.Text;
+
+namespace Recordingtest.EgPlugin;
+
+/// <summary>
+/// Hosts an HttpListener that delegates path routing to <see cref="StateRouter"/>.
+/// Designed to swallow listener errors so it never destabilises the SUT.
+/// </summary>
+public sealed class BridgeHttpServer : IDisposable
+{
+    private readonly HttpListener _listener;
+    private readonly StateRouter _router;
+    private readonly Thread _thread;
+    private volatile bool _stopping;
+
+    public int Port { get; }
+
+    public BridgeHttpServer(StateRouter router, int port)
+    {
+        _router = router;
+        Port = port;
+        _listener = new HttpListener();
+        _listener.Prefixes.Add($"http://localhost:{port}/");
+        _thread = new Thread(Loop) { IsBackground = true, Name = "RecordingtestBridge" };
+    }
+
+    public void Start()
+    {
+        try { _listener.Start(); }
+        catch { return; }
+        _thread.Start();
+    }
+
+    private void Loop()
+    {
+        while (!_stopping && _listener.IsListening)
+        {
+            HttpListenerContext ctx;
+            try { ctx = _listener.GetContext(); }
+            catch { return; }
+            try
+            {
+                var path = ctx.Request.Url?.AbsolutePath ?? "/";
+                var (status, body) = _router.Route(path);
+                var bytes = Encoding.UTF8.GetBytes(body);
+                ctx.Response.StatusCode = (int)status;
+                ctx.Response.ContentType = "application/json";
+                ctx.Response.ContentLength64 = bytes.LongLength;
+                ctx.Response.OutputStream.Write(bytes, 0, bytes.Length);
+                ctx.Response.OutputStream.Close();
+            }
+            catch
+            {
+                try { ctx.Response.Abort(); } catch { }
+            }
+        }
+    }
+
+    public void Dispose()
+    {
+        _stopping = true;
+        try { if (_listener.IsListening) _listener.Stop(); } catch { }
+        try { _listener.Close(); } catch { }
+    }
+}
diff --git a/src/Recordingtest.EgPlugin/HmEgBridgePlugin.cs b/src/Recordingtest.EgPlugin/HmEgBridgePlugin.cs
new file mode 100644
index 0000000..770ec24
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/HmEgBridgePlugin.cs
@@ -0,0 +1,48 @@
+using Editor.PluginInterface;
+
+namespace Recordingtest.EgPlugin;
+
+/// <summary>
+/// MEF/PluginLoader-discovered plugin. Inherits the SUT's <c>EditorPlugin</c>
+/// abstract base (which itself implements <c>HmEG.IPlugin</c>), and on construction
+/// boots a localhost HTTP bridge that exposes HmEG state to recordingtest.
+/// </summary>
+public sealed class HmEgBridgePlugin : EditorPlugin, IDisposable
+{
+    private BridgeHttpServer? _server;
+
+    public HmEgBridgePlugin()
+    {
+        StartBridge();
+    }
+
+    public override string Name => "Recordingtest.EgPlugin";
+    public override string Description => "recordingtest engine-bridge v2 (HTTP sidecar)";
+
+    protected override void Initialize()
+    {
+        // Construction already started the bridge; Initialize is a no-op safeguard.
+    }
+
+    private void StartBridge()
+    {
+        try
+        {
+            var port = PortResolver.Resolve();
+            var provider = new ReflectionEngineStateProvider(this);
+            var router = new StateRouter(provider, port);
+            _server = new BridgeHttpServer(router, port);
+            _server.Start();
+        }
+        catch
+        {
+            // never throw out of plugin construction; SUT must remain stable.
+        }
+    }
+
+    public void Dispose()
+    {
+        try { _server?.Dispose(); } catch { }
+        _server = null;
+    }
+}
diff --git a/src/Recordingtest.EgPlugin/IEngineStateProvider.cs b/src/Recordingtest.EgPlugin/IEngineStateProvider.cs
new file mode 100644
index 0000000..610d0b4
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/IEngineStateProvider.cs
@@ -0,0 +1,56 @@
+namespace Recordingtest.EgPlugin;
+
+public interface IEngineStateProvider
+{
+    IReadOnlyList<string> GetSelectedIds();
+    CameraSnapshot GetCamera();
+    SceneSnapshot GetScene();
+    bool GetRenderComplete();
+}
+
+public sealed record CameraSnapshot(double[] Eye, double[] Target, double[] Up, double Fov);
+public sealed record SceneSnapshot(int ObjectCount, string? DocumentPath);
+
+public sealed class NullEngineStateProvider : IEngineStateProvider
+{
+    public IReadOnlyList<string> GetSelectedIds() => Array.Empty<string>();
+    public CameraSnapshot GetCamera() => new(new double[] { 0, 0, 0 }, new double[] { 0, 0, 0 }, new double[] { 0, 0, 1 }, 45.0);
+    public SceneSnapshot GetScene() => new(0, null);
+    public bool GetRenderComplete() => true;
+}
+
+/// <summary>
+/// Skeleton reflection-based provider. v2 returns safe defaults; real HmEG mapping happens in v3 once SUT smoke tests confirm field shapes.
+/// </summary>
+public sealed class ReflectionEngineStateProvider : IEngineStateProvider
+{
+    private readonly object? _appManager;
+
+    public ReflectionEngineStateProvider(object? appManager)
+    {
+        _appManager = appManager;
+    }
+
+    public IReadOnlyList<string> GetSelectedIds()
+    {
+        try { _ = _appManager; return Array.Empty<string>(); }
+        catch { return Array.Empty<string>(); }
+    }
+
+    public CameraSnapshot GetCamera()
+    {
+        try { return new(new double[] { 0, 0, 0 }, new double[] { 0, 0, 0 }, new double[] { 0, 0, 1 }, 45.0); }
+        catch { return new(new double[] { 0, 0, 0 }, new double[] { 0, 0, 0 }, new double[] { 0, 0, 1 }, 45.0); }
+    }
+
+    public SceneSnapshot GetScene()
+    {
+        try { return new(0, null); }
+        catch { return new(0, null); }
+    }
+
+    public bool GetRenderComplete()
+    {
+        try { return true; } catch { return false; }
+    }
+}
diff --git a/src/Recordingtest.EgPlugin/PortResolver.cs b/src/Recordingtest.EgPlugin/PortResolver.cs
new file mode 100644
index 0000000..2d180ed
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/PortResolver.cs
@@ -0,0 +1,18 @@
+namespace Recordingtest.EgPlugin;
+
+public static class PortResolver
+{
+    public const int DefaultPort = 38080;
+    public const string EnvVarName = "RECORDINGTEST_BRIDGE_PORT";
+
+    public static int Resolve(Func<string, string?>? envReader = null)
+    {
+        envReader ??= Environment.GetEnvironmentVariable;
+        var raw = envReader(EnvVarName);
+        if (!string.IsNullOrWhiteSpace(raw) && int.TryParse(raw, out var p) && p > 0 && p < 65536)
+        {
+            return p;
+        }
+        return DefaultPort;
+    }
+}
diff --git a/src/Recordingtest.EgPlugin/Recordingtest.EgPlugin.csproj b/src/Recordingtest.EgPlugin/Recordingtest.EgPlugin.csproj
new file mode 100644
index 0000000..02e3324
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/Recordingtest.EgPlugin.csproj
@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <RootNamespace>Recordingtest.EgPlugin</RootNamespace>
+    <EnableDefaultItems>true</EnableDefaultItems>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Editor03.PluginInterface">
+      <HintPath>..\..\EG-BIM Modeler\Editor03.PluginInterface.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+    <Reference Include="HmEG">
+      <HintPath>..\..\EG-BIM Modeler\HmEG.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+  </ItemGroup>
+</Project>
diff --git a/src/Recordingtest.EgPlugin/StateRouter.cs b/src/Recordingtest.EgPlugin/StateRouter.cs
new file mode 100644
index 0000000..4ae9ad2
--- /dev/null
+++ b/src/Recordingtest.EgPlugin/StateRouter.cs
@@ -0,0 +1,116 @@
+using System.Globalization;
+using System.Net;
+using System.Text;
+
+namespace Recordingtest.EgPlugin;
+
+/// <summary>
+/// Pure logic router: maps a request path to (status, json body).
+/// No HttpListener dependency so it can be unit tested cheaply.
+/// </summary>
+public sealed class StateRouter
+{
+    private readonly IEngineStateProvider _provider;
+    private readonly int _port;
+
+    public StateRouter(IEngineStateProvider provider, int port)
+    {
+        _provider = provider;
+        _port = port;
+    }
+
+    public (HttpStatusCode Status, string Body) Route(string path)
+    {
+        var p = (path ?? "/").TrimEnd('/');
+        if (p.Length == 0) p = "/";
+        try
+        {
+            return p switch
+            {
+                "/health" => (HttpStatusCode.OK, $"{{\"status\":\"ok\",\"port\":{_port}}}"),
+                "/selection" => (HttpStatusCode.OK, BuildSelection()),
+                "/camera" => (HttpStatusCode.OK, BuildCamera()),
+                "/scene" => (HttpStatusCode.OK, BuildScene()),
+                "/render" => (HttpStatusCode.OK, BuildRender()),
+                _ => (HttpStatusCode.NotFound, "{\"error\":\"not_found\"}")
+            };
+        }
+        catch (Exception ex)
+        {
+            return (HttpStatusCode.OK, $"{{\"error\":{JsonString(ex.Message)}}}");
+        }
+    }
+
+    private string BuildSelection()
+    {
+        var ids = _provider.GetSelectedIds();
+        var sb = new StringBuilder();
+        sb.Append("{\"selected_ids\":[");
+        for (int i = 0; i < ids.Count; i++)
+        {
+            if (i > 0) sb.Append(',');
+            sb.Append(JsonString(ids[i]));
+        }
+        sb.Append("]}");
+        return sb.ToString();
+    }
+
+    private string BuildCamera()
+    {
+        var c = _provider.GetCamera();
+        return "{\"eye\":" + Vec(c.Eye) + ",\"target\":" + Vec(c.Target) + ",\"up\":" + Vec(c.Up) + ",\"fov\":" + Num(c.Fov) + "}";
+    }
+
+    private string BuildScene()
+    {
+        var s = _provider.GetScene();
+        return "{\"object_count\":" + s.ObjectCount.ToString(CultureInfo.InvariantCulture) +
+               ",\"document_path\":" + (s.DocumentPath is null ? "null" : JsonString(s.DocumentPath)) + "}";
+    }
+
+    private string BuildRender()
+    {
+        var done = _provider.GetRenderComplete();
+        return "{\"complete\":" + (done ? "true" : "false") + "}";
+    }
+
+    private static string Vec(double[] v)
+    {
+        var sb = new StringBuilder();
+        sb.Append('[');
+        for (int i = 0; i < v.Length; i++)
+        {
+            if (i > 0) sb.Append(',');
+            sb.Append(Num(v[i]));
+        }
+        sb.Append(']');
+        return sb.ToString();
+    }
+
+    private static string Num(double d) => d.ToString("R", CultureInfo.InvariantCulture);
+
+    private static string JsonString(string s)
+    {
+        var sb = new StringBuilder();
+        sb.Append('"');
+        foreach (var ch in s)
+        {
+            switch (ch)
+            {
+                case '"': sb.Append("\\\""); break;
+                case '\\': sb.Append("\\\\"); break;
+                case '\b': sb.Append("\\b"); break;
+                case '\f': sb.Append("\\f"); break;
+                case '\n': sb.Append("\\n"); break;
+                case '\r': sb.Append("\\r"); break;
+                case '\t': sb.Append("\\t"); break;
+                default:
+                    if (ch < 0x20) sb.Append("\\u").Append(((int)ch).ToString("x4", CultureInfo.InvariantCulture));
+                    else sb.Append(ch);
+                    break;
+            }
+        }
+        sb.Append('"');
+        return sb.ToString();
+    }
+}
diff --git a/src/Recordingtest.EngineBridge.Client/EngineBridgeException.cs b/src/Recordingtest.EngineBridge.Client/EngineBridgeException.cs
new file mode 100644
index 0000000..57ccdd4
--- /dev/null
+++ b/src/Recordingtest.EngineBridge.Client/EngineBridgeException.cs
@@ -0,0 +1,11 @@
+namespace Recordingtest.EngineBridge.Client;
+
+public sealed class EngineBridgeException : Exception
+{
+    public string Endpoint { get; }
+    public EngineBridgeException(string endpoint, string message, Exception? inner = null)
+        : base($"engine-bridge {endpoint}: {message}", inner)
+    {
+        Endpoint = endpoint;
+    }
+}
diff --git a/src/Recordingtest.EngineBridge.Client/HmEgHttpSnapshot.cs b/src/Recordingtest.EngineBridge.Client/HmEgHttpSnapshot.cs
new file mode 100644
index 0000000..a7880b3
--- /dev/null
+++ b/src/Recordingtest.EngineBridge.Client/HmEgHttpSnapshot.cs
@@ -0,0 +1,121 @@
+using System.Net.Http;
+using System.Text.Json;
+
+namespace Recordingtest.EngineBridge.Client;
+
+public sealed class HmEgHttpSnapshot : IEngineSnapshot, IDisposable
+{
+    public const string DefaultBaseUrl = "http://localhost:38080";
+    private readonly HttpClient _http;
+    private readonly bool _ownsClient;
+    private readonly string _baseUrl;
+
+    public HmEgHttpSnapshot(string baseUrl = DefaultBaseUrl, HttpClient? httpClient = null, TimeSpan? timeout = null)
+    {
+        _baseUrl = baseUrl.TrimEnd('/');
+        if (httpClient is null)
+        {
+            _http = new HttpClient { Timeout = timeout ?? TimeSpan.FromSeconds(2) };
+            _ownsClient = true;
+        }
+        else
+        {
+            _http = httpClient;
+            if (timeout.HasValue) _http.Timeout = timeout.Value;
+            _ownsClient = false;
+        }
+    }
+
+    public IReadOnlyList<string> SelectedObjectIds
+    {
+        get
+        {
+            using var doc = Get("/selection");
+            var arr = doc.RootElement.GetProperty("selected_ids");
+            var list = new List<string>(arr.GetArrayLength());
+            foreach (var e in arr.EnumerateArray()) list.Add(e.GetString() ?? string.Empty);
+            return list;
+        }
+    }
+
+    public CameraState Camera
+    {
+        get
+        {
+            using var doc = Get("/camera");
+            var r = doc.RootElement;
+            return new CameraState(
+                ToArray(r.GetProperty("eye")),
+                ToArray(r.GetProperty("target")),
+                ToArray(r.GetProperty("up")),
+                r.GetProperty("fov").GetDouble());
+        }
+    }
+
+    public SceneSummary Scene
+    {
+        get
+        {
+            using var doc = Get("/scene");
+            var r = doc.RootElement;
+            string? path = r.TryGetProperty("document_path", out var dp) && dp.ValueKind == JsonValueKind.String ? dp.GetString() : null;
+            return new SceneSummary(r.GetProperty("object_count").GetInt32(), path);
+        }
+    }
+
+    public bool IsRenderComplete
+    {
+        get
+        {
+            using var doc = Get("/render");
+            return doc.RootElement.GetProperty("complete").GetBoolean();
+        }
+    }
+
+    public bool IsHealthy
+    {
+        get
+        {
+            try
+            {
+                using var doc = Get("/health");
+                return doc.RootElement.TryGetProperty("status", out var s) && s.GetString() == "ok";
+            }
+            catch (EngineBridgeException) { return false; }
+        }
+    }
+
+    private JsonDocument Get(string endpoint)
+    {
+        try
+        {
+            using var resp = _http.GetAsync(_baseUrl + endpoint).GetAwaiter().GetResult();
+            if (!resp.IsSuccessStatusCode)
+                throw new EngineBridgeException(endpoint, $"HTTP {(int)resp.StatusCode}");
+            var body = resp.Content.ReadAsStringAsync().GetAwaiter().GetResult();
+            return JsonDocument.Parse(body);
+        }
+        catch (EngineBridgeException) { throw; }
+        catch (TaskCanceledException ex)
+        {
+            throw new EngineBridgeException(endpoint, "timeout", ex);
+        }
+        catch (Exception ex)
+        {
+            throw new EngineBridgeException(endpoint, ex.Message, ex);
+        }
+    }
+
+    private static double[] ToArray(JsonElement e)
+    {
+        var arr = new double[e.GetArrayLength()];
+        int i = 0;
+        foreach (var item in e.EnumerateArray()) arr[i++] = item.GetDouble();
+        return arr;
+    }
+
+    public void Dispose()
+    {
+        if (_ownsClient) _http.Dispose();
+    }
+}
diff --git a/src/Recordingtest.EngineBridge.Client/Recordingtest.EngineBridge.Client.csproj b/src/Recordingtest.EngineBridge.Client/Recordingtest.EngineBridge.Client.csproj
new file mode 100644
index 0000000..ddfd988
--- /dev/null
+++ b/src/Recordingtest.EngineBridge.Client/Recordingtest.EngineBridge.Client.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <RootNamespace>Recordingtest.EngineBridge.Client</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Recordingtest.EngineBridge\Recordingtest.EngineBridge.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/tests/Recordingtest.EgPlugin.Tests/Recordingtest.EgPlugin.Tests.csproj b/tests/Recordingtest.EgPlugin.Tests/Recordingtest.EgPlugin.Tests.csproj
new file mode 100644
index 0000000..61777e2
--- /dev/null
+++ b/tests/Recordingtest.EgPlugin.Tests/Recordingtest.EgPlugin.Tests.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Recordingtest.EgPlugin.Tests</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Recordingtest.EgPlugin\Recordingtest.EgPlugin.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/tests/Recordingtest.EgPlugin.Tests/StateRouterTests.cs b/tests/Recordingtest.EgPlugin.Tests/StateRouterTests.cs
new file mode 100644
index 0000000..37e416c
--- /dev/null
+++ b/tests/Recordingtest.EgPlugin.Tests/StateRouterTests.cs
@@ -0,0 +1,64 @@
+using System.Net;
+using Recordingtest.EgPlugin;
+using Xunit;
+
+namespace Recordingtest.EgPlugin.Tests;
+
+public class StateRouterTests
+{
+    private sealed class FixedProvider : IEngineStateProvider
+    {
+        public IReadOnlyList<string> GetSelectedIds() => new[] { "x", "y" };
+        public CameraSnapshot GetCamera() => new(new double[] { 1, 2, 3 }, new double[] { 0, 0, 0 }, new double[] { 0, 0, 1 }, 45);
+        public SceneSnapshot GetScene() => new(7, "doc.hmeg");
+        public bool GetRenderComplete() => true;
+    }
+
+    private sealed class FaultyProvider : IEngineStateProvider
+    {
+        public IReadOnlyList<string> GetSelectedIds() => throw new InvalidOperationException("boom");
+        public CameraSnapshot GetCamera() => throw new InvalidOperationException();
+        public SceneSnapshot GetScene() => throw new InvalidOperationException();
+        public bool GetRenderComplete() => throw new InvalidOperationException();
+    }
+
+    [Fact]
+    public void StateRouter_SelectionPath_UsesProvider_ReturnsJson()
+    {
+        var r = new StateRouter(new FixedProvider(), 38080);
+        var (status, body) = r.Route("/selection");
+        Assert.Equal(HttpStatusCode.OK, status);
+        Assert.Contains("\"selected_ids\":[\"x\",\"y\"]", body);
+    }
+
+    [Fact]
+    public void StateRouter_FaultyProvider_ReturnsErrorPayload()
+    {
+        var r = new StateRouter(new FaultyProvider(), 38080);
+        var (_, body) = r.Route("/selection");
+        Assert.Contains("\"error\"", body);
+        Assert.Contains("boom", body);
+    }
+
+    [Fact]
+    public void StateRouter_UnknownPath_Returns404()
+    {
+        var r = new StateRouter(new FixedProvider(), 38080);
+        var (status, _) = r.Route("/nope");
+        Assert.Equal(HttpStatusCode.NotFound, status);
+    }
+
+    [Fact]
+    public void PortResolver_EnvVarSet_ReturnsEnvPort()
+    {
+        var p = PortResolver.Resolve(_ => "45000");
+        Assert.Equal(45000, p);
+    }
+
+    [Fact]
+    public void PortResolver_EnvVarMissing_ReturnsDefault()
+    {
+        var p = PortResolver.Resolve(_ => null);
+        Assert.Equal(PortResolver.DefaultPort, p);
+    }
+}
diff --git a/tests/Recordingtest.EngineBridge.IntegrationTests/FakeBridgeServer.cs b/tests/Recordingtest.EngineBridge.IntegrationTests/FakeBridgeServer.cs
new file mode 100644
index 0000000..3abdb74
--- /dev/null
+++ b/tests/Recordingtest.EngineBridge.IntegrationTests/FakeBridgeServer.cs
@@ -0,0 +1,72 @@
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Recordingtest.EngineBridge.IntegrationTests;
+
+public sealed class FakeBridgeServer : IDisposable
+{
+    public Dictionary<string, string> Responses { get; } = new();
+    public TimeSpan ResponseDelay { get; set; } = TimeSpan.Zero;
+
+    private readonly HttpListener _listener;
+    private readonly Thread _thread;
+    private volatile bool _stop;
+
+    public int Port { get; }
+    public string BaseUrl => $"http://localhost:{Port}";
+
+    public FakeBridgeServer()
+    {
+        Port = FindFreePort();
+        _listener = new HttpListener();
+        _listener.Prefixes.Add($"http://localhost:{Port}/");
+        _listener.Start();
+        _thread = new Thread(Loop) { IsBackground = true };
+        _thread.Start();
+    }
+
+    private static int FindFreePort()
+    {
+        var l = new TcpListener(IPAddress.Loopback, 0);
+        l.Start();
+        var p = ((IPEndPoint)l.LocalEndpoint).Port;
+        l.Stop();
+        return p;
+    }
+
+    private void Loop()
+    {
+        while (!_stop && _listener.IsListening)
+        {
+            HttpListenerContext ctx;
+            try { ctx = _listener.GetContext(); }
+            catch { return; }
+            try
+            {
+                if (ResponseDelay > TimeSpan.Zero) Thread.Sleep(ResponseDelay);
+                var path = ctx.Request.Url?.AbsolutePath ?? "/";
+                if (Responses.TryGetValue(path, out var body))
+                {
+                    var bytes = Encoding.UTF8.GetBytes(body);
+                    ctx.Response.StatusCode = 200;
+                    ctx.Response.ContentType = "application/json";
+                    ctx.Response.OutputStream.Write(bytes, 0, bytes.Length);
+                }
+                else
+                {
+                    ctx.Response.StatusCode = 404;
+                }
+                ctx.Response.OutputStream.Close();
+            }
+            catch { try { ctx.Response.Abort(); } catch { } }
+        }
+    }
+
+    public void Dispose()
+    {
+        _stop = true;
+        try { _listener.Stop(); } catch { }
+        try { _listener.Close(); } catch { }
+    }
+}
diff --git a/tests/Recordingtest.EngineBridge.IntegrationTests/HmEgHttpSnapshotTests.cs b/tests/Recordingtest.EngineBridge.IntegrationTests/HmEgHttpSnapshotTests.cs
new file mode 100644
index 0000000..10fa751
--- /dev/null
+++ b/tests/Recordingtest.EngineBridge.IntegrationTests/HmEgHttpSnapshotTests.cs
@@ -0,0 +1,66 @@
+using Recordingtest.EngineBridge.Client;
+using Xunit;
+
+namespace Recordingtest.EngineBridge.IntegrationTests;
+
+public class HmEgHttpSnapshotTests
+{
+    [Fact]
+    public void Client_SelectionEndpoint_ReturnsIds()
+    {
+        using var srv = new FakeBridgeServer();
+        srv.Responses["/selection"] = "{\"selected_ids\":[\"a\",\"b\"]}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl);
+        Assert.Equal(new[] { "a", "b" }, c.SelectedObjectIds);
+    }
+
+    [Fact]
+    public void Client_CameraEndpoint_ReturnsCameraState()
+    {
+        using var srv = new FakeBridgeServer();
+        srv.Responses["/camera"] = "{\"eye\":[1,2,3],\"target\":[4,5,6],\"up\":[0,0,1],\"fov\":50}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl);
+        var cam = c.Camera;
+        Assert.Equal(new double[] { 1, 2, 3 }, cam.EyePoint);
+        Assert.Equal(new double[] { 4, 5, 6 }, cam.Target);
+        Assert.Equal(50, cam.Fov);
+    }
+
+    [Fact]
+    public void Client_SceneEndpoint_ReturnsSceneSummary()
+    {
+        using var srv = new FakeBridgeServer();
+        srv.Responses["/scene"] = "{\"object_count\":42,\"document_path\":\"C:/m.hmeg\"}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl);
+        var s = c.Scene;
+        Assert.Equal(42, s.ObjectCount);
+        Assert.Equal("C:/m.hmeg", s.DocumentPath);
+    }
+
+    [Fact]
+    public void Client_RenderEndpoint_ReturnsIsComplete()
+    {
+        using var srv = new FakeBridgeServer();
+        srv.Responses["/render"] = "{\"complete\":true}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl);
+        Assert.True(c.IsRenderComplete);
+    }
+
+    [Fact]
+    public void Client_HealthEndpoint_ReturnsOk()
+    {
+        using var srv = new FakeBridgeServer();
+        srv.Responses["/health"] = "{\"status\":\"ok\",\"port\":1}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl);
+        Assert.True(c.IsHealthy);
+    }
+
+    [Fact]
+    public void Client_Timeout_ThrowsEngineBridgeException()
+    {
+        using var srv = new FakeBridgeServer { ResponseDelay = TimeSpan.FromSeconds(5) };
+        srv.Responses["/selection"] = "{\"selected_ids\":[]}";
+        using var c = new HmEgHttpSnapshot(srv.BaseUrl, timeout: TimeSpan.FromMilliseconds(500));
+        Assert.Throws<EngineBridgeException>(() => _ = c.SelectedObjectIds);
+    }
+}
diff --git a/tests/Recordingtest.EngineBridge.IntegrationTests/Recordingtest.EngineBridge.IntegrationTests.csproj b/tests/Recordingtest.EngineBridge.IntegrationTests/Recordingtest.EngineBridge.IntegrationTests.csproj
new file mode 100644
index 0000000..83aaf62
--- /dev/null
+++ b/tests/Recordingtest.EngineBridge.IntegrationTests/Recordingtest.EngineBridge.IntegrationTests.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Recordingtest.EngineBridge.IntegrationTests</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Recordingtest.EngineBridge.Client\Recordingtest.EngineBridge.Client.csproj" />
+  </ItemGroup>
+</Project>