TalksAWS re:Invent 2025 - Browser Power: Building MCP Tools That Do Real Work (AIM224)

AWS re:Invent 2025 - Browser Power: Building MCP Tools That Do Real Work (AIM224)

AWS re:Invent 2025 - Browser Power: Building MCP Tools That Do Real Work (AIM224)

Overview of MCP (Model Context Protocol)

  • MCP (Model Context Protocol) was defined by Anthropic late last year as a way to enable interoperability between siloed data across different applications.
  • MCP servers act as an interface that allows LLM-based agents to interact with this otherwise siloed data.
  • MCP servers can surface existing APIs, but also provide more complex custom logic and flexibility by leveraging LLMs to execute more sophisticated tasks.

Cloudflare's MCP Offering

  • Cloudflare has developed a compelling offering to help organizations launch MCP servers quickly while minimizing operational overhead.
  • Cloudflare's remote MCP offerings currently include around 13 different servers, covering a range of use cases like observability, coding agents, documentation, and even availability services like Radar.
  • Cloudflare believes that giving customers the ability to make granular choices about the features and functionality they want to incorporate into their MCP servers will be a winning strategy.

Rapid MCP Server Development

  • Cloudflare has worked with companies like PayPal, Stripe, Webflow, Block, and Atlassian to help them launch their first MCP servers.
  • In one case, PayPal was able to go from concept to a production-ready MCP server for their invoicing scenarios within 3 days.

Technical Details of Cloudflare's MCP Platform

  • MCP servers on Cloudflare's platform are built on top of their primitives, such as Durable Objects.
  • Durable Objects provide serverless compute tied with stateful storage, allowing for scale-to-zero compute for individual calls while maintaining a stateful backend for short-term and long-term memory.
  • The distributed architecture of Cloudflare's platform provides a single global data plane, with localized compute and storage for each user, without the need for managing separate control clusters or availability zones.

Leveraging Browser Rendering for Flexible Interactions

  • Agents may not always have clearly defined APIs to interact with, so Cloudflare's platform provides browser rendering capabilities, which give agents a headless browser to scrape content and perform Puppeteer-style interactions.
  • This allows agents to plan and execute interactions with web pages without needing direct API access to the systems they're interacting with.

Benefits of Durable Objects for MCP Servers

  • Durable Objects provide remarkable horizontal scalability, with each conversation session getting its own sharded compute and storage resources.
  • The memory tied to each Durable Object instance allows for flexibility in interaction patterns, such as tying conversations to individual users or allowing multiple users to interact with a single agent conversation.

Additional Cloudflare Offerings for Agent Workloads

  • Cloudflare also provides Dynamic Worker Loaders, which allow for the dynamic execution of JavaScript or TypeScript code generated by agents, with near-zero millisecond cold start times and millisecond-level compute billing.
  • This is ideal for sandboxing use cases and the execution of untrusted, agent-generated code.

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