---
title: Code Mode for MCP server portals
description: MCP server portals support Code Mode, which reduces context window usage by collapsing tools into a single code execution tool.
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Code Mode for MCP server portals

Mar 26, 2026 

[ Access ](https://developers.cloudflare.com/cloudflare-one/access-controls/policies/) 

[MCP server portals](https://developers.cloudflare.com/cloudflare-one/access-controls/ai-controls/mcp-portals/) support [Code Mode MCP server patterns](https://developers.cloudflare.com/agents/model-context-protocol/codemode/), a technique that reduces context window usage by replacing individual tool definitions with a single code execution tool. Code Mode is turned on by default on all portals.

To turn it off, edit the portal in **Access controls** \> **AI controls** and turn off **Code Mode** under **Basic information**.

When Code Mode is active, the portal exposes a single `code` tool instead of listing every tool from every upstream MCP server. The connected AI agent writes JavaScript that calls typed `codemode.*` methods for each upstream tool. The generated code runs in an isolated [Dynamic Worker](https://developers.cloudflare.com/workers/runtime-apis/bindings/worker-loader/) environment, keeping authentication credentials and environment variables out of the model context.

To use Code Mode, append `?codemode=search_and_execute` to your portal URL when connecting from an MCP client:

```
https://<subdomain>.<domain>/mcp?codemode=search_and_execute
```

For more information, refer to [Code Mode](https://developers.cloudflare.com/cloudflare-one/access-controls/ai-controls/mcp-portals/#code-mode).

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