Add platform info for sandbox sdk (#25860)

Author: ghostwriternr

src/content/docs/sandbox/index.mdx

@@ -207,9 +207,13 @@ Stateful coordination layer that enables Sandbox to maintain persistent environm
 	Learn about the Sandbox Beta, current status, and upcoming features.
 </LinkTitleCard>
 
+<LinkTitleCard title="Pricing" href="/sandbox/platform/pricing/" icon="document">
+	Understand Sandbox pricing based on the underlying Containers platform.
+</LinkTitleCard>
+
 <LinkTitleCard title="Limits" href="/sandbox/platform/limits/" icon="document">
-	Understand Sandbox resource limits, quotas, and best practices for working
-	within them.
+	Learn about resource limits, quotas, and best practices for working within
+	them.
 </LinkTitleCard>
 
 <LinkTitleCard

src/content/docs/sandbox/platform/beta-info.mdx

@@ -0,0 +1,38 @@
+---
+title: Beta Information
+pcx_content_type: reference
+sidebar:
+  order: 3
+---
+
+Sandbox SDK is currently in open beta. This means the product is publicly available and ready to use, but we're actively gathering feedback and may make changes based on what we learn.
+
+## What to Expect
+
+During the beta period:
+
+- **API stability** - The core API is stable, but we may introduce new features or adjust existing ones based on feedback
+- **Production use** - You can use Sandbox SDK in production, but be aware of potential changes
+- **Active development** - We're continuously improving performance, adding features, and fixing bugs
+- **Documentation updates** - Guides and examples will be refined as we learn from real-world usage
+
+## Known Limitations
+
+See [Containers Beta Information](/containers/beta-info/) for current limitations and known issues, as Sandbox SDK inherits the same constraints.
+
+## Feedback Wanted
+
+We'd love to hear about your experience with Sandbox SDK:
+
+- What are you building?
+- What features would be most valuable?
+- What challenges have you encountered?
+- What instance sizes do you need?
+
+Share your feedback:
+
+- [GitHub Issues](https://github.com/cloudflare/sandbox-sdk/issues) - Report bugs or request features
+- [Developer Discord](https://discord.cloudflare.com) - Chat with the team and community
+- [Community Forum](https://community.cloudflare.com) - Discuss use cases and best practices
+
+Check the [GitHub repository](https://github.com/cloudflare/sandbox-sdk) for the latest updates and upcoming features.

src/content/docs/sandbox/platform/index.mdx

@@ -0,0 +1,16 @@
+---
+title: Platform
+pcx_content_type: navigation
+sidebar:
+  order: 10
+---
+
+Information about the Sandbox SDK platform, including pricing, limits, and beta status.
+
+## Available resources
+
+- [Pricing](/sandbox/platform/pricing/) - Understand costs based on the Containers platform
+- [Limits](/sandbox/platform/limits/) - Resource limits and best practices
+- [Beta Information](/sandbox/platform/beta-info/) - Current status and roadmap
+
+Since Sandbox SDK is built on [Containers](/containers/), it shares the same underlying platform characteristics. Refer to these pages to understand how pricing and limits work for your sandbox deployments.

src/content/docs/sandbox/platform/limits.mdx

@@ -0,0 +1,24 @@
+---
+title: Limits
+pcx_content_type: reference
+sidebar:
+  order: 2
+---
+
+Since the Sandbox SDK is built on top of the [Containers](/containers/) platform, it shares the same underlying platform characteristics. Refer to these pages to understand how pricing and limits work for your sandbox deployments.
+
+## Container Limits
+
+Refer to [Containers limits](/containers/platform-details/limits/) for complete details on:
+
+- Memory, vCPU, and disk limits for concurrent container instances
+- Instance types and their resource allocations
+- Image size and storage limits
+
+## Best Practices
+
+To work within these limits:
+
+- **Right-size your instances** - Choose the appropriate [instance type](/containers/platform-details/limits/#instance-types) based on your workload requirements
+- **Clean up unused sandboxes** - Terminate sandbox sessions when they're no longer needed to free up resources
+- **Optimize images** - Keep your [custom Dockerfiles](/sandbox/configuration/dockerfile/) lean to reduce image size

src/content/docs/sandbox/platform/pricing.mdx

@@ -0,0 +1,22 @@
+---
+title: Pricing
+pcx_content_type: reference
+sidebar:
+  order: 1
+---
+
+Sandbox SDK pricing is determined by the underlying [Containers](/containers/) platform it's built on.
+
+## Containers Pricing
+
+Refer to [Containers pricing](/containers/pricing/) for complete details on:
+- vCPU, memory, and disk usage rates
+- Network egress pricing
+- Instance types and their costs
+
+## Related Pricing
+
+When using Sandbox, you'll also be billed for:
+- [Workers](/workers/platform/pricing/) - Handles incoming requests to your sandbox
+- [Durable Objects](/durable-objects/platform/pricing/) - Powers each sandbox instance
+- [Workers Logs](/workers/observability/logs/workers-logs/#pricing) - Optional observability (if enabled)