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Author

Alex Mercier

Building the contracts and tooling behind every DeesseJS template. Former platform engineer, now writes about what actually ships.

4 posts

  • 2026-07-14engineering
    From CLI to MCP: extending the registry without forking it
    Plugins, hooks, and the surface area we expose to MCP servers. Why we picked this over a marketplace.
    Alex Mercier
    5 min read
  • 2026-06-16engineering
    Stripe webhooks are not a contract: how we made them one
    Subscriptions, usage metering, and dunning each have a dozen edge cases. We encoded them as a single typed interface.
    Alex Mercier
    4 min read
  • 2026-06-09engineering
    Better Auth vs Roll-your-own: the boring option won
    We considered Clerk, Lucia, and writing our own. We picked Better Auth because it's the only one an agent can debug at 2am.
    Alex Mercier
    4 min read
  • 2026-05-19engineering
    How an AI agent reads a DeesseJS template
    An agent doesn't grep for files. It reads the contracts, the manifest, and the AGENTS.md. Here's what that looks like in practice.
    Alex Mercier
    4 min read