diff --git a/content/Get-Started/app-configuration.mdx b/content/Get-Started/app-configuration.mdx
index cbd16229..cf91840e 100644
--- a/content/Get-Started/app-configuration.mdx
+++ b/content/Get-Started/app-configuration.mdx
@@ -159,6 +159,30 @@ If you don't set provider API keys, LLM requests are routed through the Agentuit
 Environment variables prefixed with `AGENTUITY_PUBLIC_`, `VITE_`, or `PUBLIC_` are exposed to the frontend bundle and visible in the browser. Never put secrets or API keys in these variables.
 </Callout>
 
+### Platform-Injected Environment Variables
+
+When your project is deployed to Agentuity Cloud, the platform automatically injects the following environment variables into your runtime. You do not need to set these yourself.
+
+| Variable | Description |
+|----------|-------------|
+| `AGENTUITY_CLOUD_BASE_URL` | The base URL of your deployment (e.g., `https://dep-abc123.agentuity.cloud`). Used internally for authentication callbacks and as the canonical URL for the running deployment. |
+| `AGENTUITY_CLOUD_DOMAINS` | Comma-separated list of all domains associated with the deployment, including the deployment URL, project URL, any custom domains (CNAMEs), and PR preview URLs. |
+| `AGENTUITY_CLOUD_ORG_ID` | Your organization ID. |
+| `AGENTUITY_CLOUD_PROJECT_ID` | Your project ID. |
+| `AGENTUITY_CLOUD_DEPLOYMENT_ID` | The current deployment ID. |
+
+```typescript
+// Access the deployed URL
+const baseUrl = process.env.AGENTUITY_CLOUD_BASE_URL;
+
+// Access all associated domains
+const domains = process.env.AGENTUITY_CLOUD_DOMAINS?.split(',');
+```
+
+<Callout type="info" title="Automatic CORS & Auth">
+`AGENTUITY_CLOUD_BASE_URL` and `AGENTUITY_CLOUD_DOMAINS` are automatically used by the runtime for CORS origin validation and by `@agentuity/auth` for trusted origins. You typically don't need to reference them directly unless you have custom domain logic.
+</Callout>
+
 ## Infrastructure as Code
 
 Unlike traditional platforms, Agentuity defines infrastructure in your route files:
diff --git a/content/Reference/CLI/deployment.mdx b/content/Reference/CLI/deployment.mdx
index b71f2f61..52fd5754 100644
--- a/content/Reference/CLI/deployment.mdx
+++ b/content/Reference/CLI/deployment.mdx
@@ -78,6 +78,30 @@ agentuity deploy
 
 Both URLs are automatically provisioned with HTTPS. The project URL always routes to the active deployment.
 
+### Deployment Environment Variables
+
+When deployed, the platform automatically injects environment variables so your agents can discover their own URLs at runtime:
+
+| Variable | Description |
+|----------|-------------|
+| `AGENTUITY_CLOUD_BASE_URL` | The base URL of the current deployment (e.g., `https://dep-abc123.agentuity.cloud`). |
+| `AGENTUITY_CLOUD_DOMAINS` | Comma-separated list of all domains for the deployment — deployment URL, project URL, custom domains (CNAMEs), and PR preview URLs. |
+| `AGENTUITY_CLOUD_DEPLOYMENT_ID` | The current deployment ID. |
+| `AGENTUITY_CLOUD_PROJECT_ID` | The project ID. |
+| `AGENTUITY_CLOUD_ORG_ID` | The organization ID. |
+
+```typescript
+// Get the canonical URL for this deployment
+const myUrl = process.env.AGENTUITY_CLOUD_BASE_URL;
+
+// Get all domains (including custom domains / CNAMEs)
+const domains = process.env.AGENTUITY_CLOUD_DOMAINS?.split(',');
+```
+
+<Callout type="info" title="Automatic CORS & Auth">
+These variables are automatically used by the runtime for CORS origin validation and by `@agentuity/auth` for trusted origins. You only need to reference them directly if you have custom domain logic.
+</Callout>
+
 ## Viewing Deployments
 
 List recent deployments:
diff --git a/content/Reference/sdk-reference.mdx b/content/Reference/sdk-reference.mdx
index c8abb730..260227d8 100644
--- a/content/Reference/sdk-reference.mdx
+++ b/content/Reference/sdk-reference.mdx
@@ -126,6 +126,20 @@ Agentuity applications access configuration and secrets through standard Node.js
 - `AGENTUITY_SDK_KEY` - SDK-level API key (used in development to access Agentuity Cloud)
 - `AGENTUITY_PROJECT_KEY` - Project-level API key (used when deployed)
 
+**Platform-Injected Environment Variables (Cloud Deployments):**
+
+These are automatically set by the Agentuity platform when your project is deployed. You do not need to configure them.
+
+| Variable | Description |
+|----------|-------------|
+| `AGENTUITY_CLOUD_BASE_URL` | The base URL of your deployment (e.g., `https://dep-abc123.agentuity.cloud`). Used for authentication callbacks and as the canonical deployment URL. |
+| `AGENTUITY_CLOUD_DOMAINS` | Comma-separated list of all domains for the deployment — includes the deployment URL, project URL, custom domains (CNAMEs), and PR preview URLs. |
+| `AGENTUITY_CLOUD_ORG_ID` | Your organization ID. |
+| `AGENTUITY_CLOUD_PROJECT_ID` | Your project ID. |
+| `AGENTUITY_CLOUD_DEPLOYMENT_ID` | The current deployment ID. |
+
+`AGENTUITY_CLOUD_BASE_URL` and `AGENTUITY_CLOUD_DOMAINS` are used automatically by the runtime for CORS origin validation and by `@agentuity/auth` for trusted origins.
+
 **Example**
 
 ```typescript
@@ -143,9 +157,13 @@ const { server, logger } = await createApp();
 const apiEndpoint = process.env.API_ENDPOINT || 'https://api.example.com';
 const openaiKey = process.env.OPENAI_API_KEY;
 // Optional: you can use the AI Gateway to access OpenAI, Anthropic, etc without needing to set various API keys.
+
+// Access platform-injected variables (available in cloud deployments)
+const deployedUrl = process.env.AGENTUITY_CLOUD_BASE_URL;
+const allDomains = process.env.AGENTUITY_CLOUD_DOMAINS?.split(',');
 ```
 
-**Note**: Environment variables are typically loaded from a `.env` file in development and configured in your deployment environment.
+**Note**: Environment variables are typically loaded from a `.env` file in development and configured in your deployment environment. Platform-injected variables like `AGENTUITY_CLOUD_BASE_URL` and `AGENTUITY_CLOUD_DOMAINS` are only available when deployed to Agentuity Cloud.
 
 ---