> But I need to have everything in a mono repo for agents to properly work on in.

Why was this a problem with Deno? Up until recently you had to use package.json and npm/pnpm for it to work, but even then it was better than Bun or Node since you could use import map to avoid compiling packages for testing etc (Node and Bun's type stripping doesn't work across local monorepo dependencies, and tsx produces mangled source maps making debugging a hassle). Now Deno has built-in workspace/monorepo support in deno.json.