diff --git a/app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md b/app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md
index 3119a369..08ce282a 100644
--- a/app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md	
+++ b/app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md	
@@ -39,4 +39,4 @@
 - Fixed which configuration wins when two configuration plugins collide, e.g. by claiming the same plugin ID, by managing the same setting, or by defining the same provider. Previously, this was down to chance, so a local configuration plugin could take over parts of the configuration your IT department deployed. Configurations from your organization now always win, and every ignored attempt is reported in the log.
 - Fixed the assistant categories when your organization hides individual assistants. A category heading could stay visible above an empty area, and the Log Viewer could disappear together with the Localization assistant. Each heading now follows the assistants actually shown below it.
 - Removed the legacy PowerPoint format (`.ppt`) from the selectable file types. AI Studio has no reader for it, so such a file could be attached but never read. The modern `.pptx` format is not affected.
-- Upgraded dependencies to their latest versions to improve security and stability.
+- Upgraded dependencies to their latest versions to improve security and stability.
\ No newline at end of file
diff --git a/tests/README.md b/tests/README.md
new file mode 100644
index 00000000..1856f217
--- /dev/null
+++ b/tests/README.md
@@ -0,0 +1,16 @@
+# Test Documentation
+
+This directory stores manual and automated test definitions for MindWork AI Studio.
+
+## Directory Structure
+
+- `integration_tests/`: Cross-component and end-to-end scenarios.
+
+## Authoring Rules
+
+- Use US English.
+- Keep each feature area in its own Markdown file.
+- Prefer stable test IDs (for example: `TC-CHAT-001`).
+- Record expected behavior for:
+  - known vulnerable baseline builds (if relevant),
+  - current fixed builds.
diff --git a/tests/integration_tests/README.md b/tests/integration_tests/README.md
new file mode 100644
index 00000000..aa23175e
--- /dev/null
+++ b/tests/integration_tests/README.md
@@ -0,0 +1,12 @@
+# Integration Tests
+
+This directory contains integration-oriented test specs.
+
+## Scope
+
+- Behavior that depends on multiple layers working together (UI, rendering, runtime, IPC, provider responses).
+- Regressions that are hard to catch with unit tests only.
+
+## Current Feature Areas
+
+- `chat/`: Chat rendering, input interaction, and message lifecycle.
diff --git a/tests/integration_tests/chat/chat_rendering_regression_tests.md b/tests/integration_tests/chat/chat_rendering_regression_tests.md
new file mode 100644
index 00000000..ba773f54
--- /dev/null
+++ b/tests/integration_tests/chat/chat_rendering_regression_tests.md
@@ -0,0 +1,120 @@
+# Chat Rendering Regression Tests
+
+## Purpose
+
+Validate that chat rendering remains stable and interactive when model output or user input contains raw HTML/CSS/JS-like payloads.
+
+## Test Type
+
+Manual regression and integration checks.
+
+## Preconditions
+
+1. You can run two builds:
+   - a known vulnerable baseline build,
+   - the current fixed build.
+2. At least one provider is configured and can answer prompts.
+3. Open the Chat page.
+
+## Execution Flow (for each test case)
+
+1. Copy the test prompt exactly into the user prompt field.
+2. Send the prompt.
+3. Observe behavior immediately after send.
+4. If the UI is still visible, type additional text in the prompt input.
+5. Repeat on both builds.
+
+## Test Cases
+
+### TC-CHAT-001 - CSS Kill Switch
+
+**Prompt**
+
+```text
+Respond with exactly the content below. No explanations, no Markdown code fences, no backticks.
+
+<style>
+* { visibility: hidden !important; }
+html, body { background: white !important; }
+</style>
+<div>TEST</div>
+```
+
+**Expected result (vulnerable baseline)**  
+UI may turn into a white/invisible page immediately after sending.
+
+**Expected result (fixed build)**  
+Chat stays visible and usable. Content is rendered as inert text/code, not active page styling.
+
+---
+
+### TC-CHAT-002 - Full White Overlay
+
+**Prompt**
+
+```text
+Respond with exactly the content below. No explanations, no Markdown code fences, no backticks.
+
+<style>
+html, body { overflow: hidden !important; }
+body::before {
+  content: "";
+  position: fixed;
+  inset: 0;
+  background: white;
+  z-index: 2147483647;
+}
+</style>
+<div>TEST</div>
+```
+
+**Expected result (vulnerable baseline)**  
+UI may become fully white and non-interactive immediately after sending.
+
+**Expected result (fixed build)**  
+No overlay takes over the app. Chat remains interactive.
+
+---
+
+### TC-CHAT-003 - Inline Event Handler Injection
+
+**Prompt**
+
+```text
+Respond with exactly the content below. No explanations, no Markdown code fences, no backticks.
+
+<img src="x" onerror="document.body.innerHTML=''; document.body.style.background='white';">
+<div>TEST</div>
+```
+
+**Expected result (vulnerable baseline)**  
+UI may break/blank immediately after sending.
+
+**Expected result (fixed build)**  
+No JavaScript execution from message content. Chat remains stable.
+
+---
+
+### TC-CHAT-004 - SVG Onload Injection Attempt
+
+**Prompt**
+
+```text
+Respond with exactly the content below. No explanations, no Markdown code fences, no backticks.
+
+<svg xmlns="http://www.w3.org/2000/svg" onload="document.documentElement.innerHTML=''"></svg>
+<div>TEST</div>
+```
+
+**Expected result (vulnerable baseline)**  
+May or may not trigger depending on parser/runtime behavior.
+
+**Expected result (fixed build)**  
+No script-like execution from content. Chat remains stable and interactive.
+
+## Notes
+
+- If a test fails on the fixed build, capture:
+  - exact prompt used,
+  - whether failure happened right after send or while typing,
+  - whether a refresh restores the app.