I Built an MCP Server So Claude Cowork Projects Can Read Each Other’s Sessions

Every Claude Cowork project lives in an isolated sandbox. That isolation is a feature: it keeps projects clean, focused, and free from cross-contamination. But it also means one project cannot see another’s session history.I hit this wall while juggling multiple related projects. I wanted to reference what I had worked through in a different Cowork session – design decisions, architectural dead ends, things that took an hour to figure out. Gone. I kept rebuilding context from scratch.Thanks for reading! Subscribe for free to receive new posts and support my work.So I decided to fix it: a Claude Cowork plugin – an MCP server paired with a companion skill – that backs up Claude Cowork project sessions to the cloud, makes them searchable, and lets any project read history from any other project. The MCP handles cloud storage and retrieval. The skill teaches Claude Cowork how to drive it with plain English. The whole thing runs on Cloudflare’s serverless platform.What I did not plan was…