
MCP on Code Mode (Interview)
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This week I’m talking with Matt Carey about Code Mode and how most of us have been thinking about MCP all wrong. Matt works on the Agents SDK and MCP at Cloudflare — we discuss how server-side Code Mode lets one MCP server expose all ~2,500 Cloudflare API endpoints in about 1,000 tokens of context, the dynamic Worker loader that runs model-written code safely in a V8 isolate, Matt’s own workflow with Claude, where memory fits into the future of agents, and his Zaggy git wrapper that keeps agents from force-pushing his repos.
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Sponsors:
- Coder.com – Secure environments where devs and agents work in parallel. Open by design. Secure by default.
- Tailscale – Adam loves Tailscale! Easy, secure, identity-based access to anything. Tailscale deploys quickly and enables Zero Trust access to any resource on your network. From CI/CD runners across multi-cloud environments, to SaaS tools and infrastructure, Tailscale connects it all, seamlessly.
- RWX – CI/CD platform for high velocity teams. When agents help developers write code in minutes, validation becomes your bottleneck. RWX gives agents programmatic control, sub-second cached builds, and semantic outputs they can act on. No commit required. Just iterate until CI passes, then push.
- Fly.io – The home of Changelog.com — Deploy your apps close to your users — global Anycast load-balancing, zero-configuration private networking, hardware isolation, and instant WireGuard VPN connections. Push-button deployments that scale to thousands of instances. Check out the speedrun to get started in minutes.
Featuring:
Show Notes:
Featured
- Matt Carey on the Cloudflare blog
- You’ve Been a Bad Agent
- Cloudflare
- Code Mode: give agents an entire API in 1,000 tokens
- Code Mode: the better way to use MCP
- Cloudflare MCP Server
- Cloudflare Agents SDK
- Cloudflare Agents SDK on GitHub
Cloudflare platform
MCP and code-mode references
- Model Context Protocol
- Introducing the Model Context Protocol
- Code execution with MCP
- CodeAct paper
- GitHub MCP Server
- Datadog MCP Server
- Pydantic Monty
Coding agents and tools
Agent memory and personal AI
Homelab and infrastructure
Something missing or broken? PRs welcome!
Join the discussion
changelog.zulipchat.comChangelog++
changelog.comCoder.com
coder.comTailscale
tailscale.comRWX
rwx.comFly.io
fly.ioCheck out the speedrun
fly.ioWebsite
mattzcarey.comGitHub
github.comLinkedIn
linkedin.comX
x.comWebsite
adamstacoviak.comGitHub
github.comLinkedIn
linkedin.comMastodon
changelog.socialX
x.comMatt Carey on the Cloudflare blog
blog.cloudflare.comYou’ve Been a Bad Agent
bad-agent.transistor.fmCloudflare
cloudflare.comCode Mode: give agents an entire API in 1,000 tokens
blog.cloudflare.comCode Mode: the better way to use MCP
blog.cloudflare.comCloudflare MCP Server
github.comCloudflare Agents SDK
developers.cloudflare.comCloudflare Agents SDK on GitHub
github.comDynamic Workers
developers.cloudflare.comCloudflare Workers
developers.cloudflare.comDurable Objects
developers.cloudflare.comAI Gateway
developers.cloudflare.comVectorize
developers.cloudflare.comModel Context Protocol
modelcontextprotocol.ioIntroducing the Model Context Protocol
anthropic.comCode execution with MCP
anthropic.comCodeAct paper
huggingface.coGitHub MCP Server
github.comDatadog MCP Server
docs.datadoghq.comPydantic Monty
pydantic.devClaude Code
docs.anthropic.comClaude Code voice dictation
code.claude.comOpenCode
opencode.aiCursor
cursor.comOpenAI Codex CLI
developers.openai.comChangesets
github.comHandy
github.comGranola
granola.aiLetta
letta.comMastra
mastra.aiSupermemory
supermemory.aiPoke
poke.comPi coding agent
pi.devSwamp Club
swamp.clubProxmox VE
proxmox.comTailscale
tailscale.com1Password
1password.comK3s
docs.k3s.ioPi-hole
pi-hole.netDuckDB
duckdb.orgApache Parquet
parquet.apache.orgClickHouse
clickhouse.comPRs welcome!
github.com
- 0:00Welcome to The Changelog
- 0:49Sponsor: Coder.com
- 3:56It's Matt Carey from Cloudflare!
- 5:15Are we holding MCP wrong?
- 8:51MCP (Model Context Protocol) explained
- 11:34The breakthrough with typescript vs tool calling
- 15:15The idea behind Code Mode
- 19:58Mapping MCP to a large API via Code Mode
- 24:35Implementing the search-and-execute pattern in MCP
- 27:45Matt's workflow with Claude
- 36:06Balancing innovation with security
- 37:41Sponsor: Tailscale
- 40:16Working alone vs working with a team
- 43:58How do you choose which projects to prioritize?
- 48:55How are you managing work/life balance?
- 50:30Life before and after agents
- 57:15Adam's flow with agents
- 1:02:23Prompting via voice
- 1:05:44Devs who are not using AI...
- 1:12:02Granola is changing note taking
- 1:16:15Sponsor: RWX
- 1:18:56Let's talk about memory for agents
- 1:28:43Taking inspiration from Homelabs
- 1:30:19Unleashing my agents on my own cloud (Proxmox and Swamp Club)
- 1:36:03Running local models
- 1:38:56Teasing DNShole (more)
- 1:42:17Key indicators of nefarious traffic
- 1:44:52Getting started with code mode
- 1:49:03Try this: --agent
- 1:53:38Closing thoughts and stuff