Summary
In a July 22, 2026 update, Cloudflare's Agents and Workers products stopped re-converting MCP JSON Schemas to Zod on every model turn by reusing converted input and output schemas while a live MCP connection keeps the same tool catalog. The release also lets non-AI-SDK hosts invoke the durable Code Mode runtime directly and adds an opt-out for Think's automatic MCP tool exposure.
What changed
Cloudflare's Agents SDK now reuses converted MCP input/output schemas for the life of a connection instead of reconverting per turn, exposes the durable Code Mode runtime to non-AI-SDK hosts, and adds an opt-out for Think's automatic MCP tool exposure.
Why it matters
Cutting repeated schema conversion reduces per-turn overhead and latency for MCP-heavy agents running on Workers, and opening Code Mode to arbitrary hosts broadens where Cloudflare's durable execution runtime can be embedded, reinforcing its pitch as the default place to run long-lived agents.
Evidence excerpt
Agents SDK MCP clients now reuse converted input and output schemas while a live connection keeps the same tool catalog, which avoids converting every MCP JSON Schema to Zod again for each model turn ... lets non-AI-SDK hosts invoke the durable Code Mode runtime directly.