Frontend development often hits a practical wall early: the backend API does not exist yet, is unreachable in local environments, or is shared between multiple teams and cannot be safely modified during development. The typical workarounds - hardcoded response stubs, in-memory interceptors, or hand-rolled Express servers - all impose overhead that does not belong in the development workflow.
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GitHub Copilot custom agents allow teams to define specialized AI assistants, each with its own role, tool access and behavioral boundaries. Instead of relying on one general-purpose assistant for everything, a team can create multiple agents that mirror the actual roles in the engineering organization. After working with custom agents for a while, the biggest insight was simple: the quality of AI-assisted engineering improves dramatically once the AI knows what role it is supposed to play.
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Single Page Applications like React expect the server to always return index.html and let the client-side router take over. On Cloudflare Workers you can do that without custom code as long as wrangler.toml is set up correctly. This post shows the minimal configuration and why two options are essential for SPAs.