rosary

The orchestrator, in movements: the methodology, then the architecture it cost to learn.

4 parts

Every design decision that survived contact with unreliable agents was a constraint. Every one that got reverted was an opinion — and eight independent orchestrators shipped in one quarter all converged on the same structure without referencing each other.
The textbook runtime for those invariants worked and still got deleted. A supervision tree supervised by a shell script supervised by a cloud platform, so one local process could be supervised properly — every layer reasonable, the stack absurd. The invariants moved; the runtime did not survive.
A subscription token and an API key are two wallets, not two doors to one room. Driving a harness and becoming the runtime are different acts, and only an HTTP 400 made that visible.
Five production incidents turned out to be one bug: a bead had no identity independent of its location, so storage mechanics were doing a job that belongs to an identity model.

AI;DR

Constraint-Driven Development: Why the 60% of Agent Projects That Survive All Look the Same
Constraints compose. Opinions don't. That's the whole difference between the systems that ship and the ones that don't.
Mar 24, 2026 · 11 min read
The Part of Elixir I Kept
I built the textbook answer to agent orchestration — OTP supervision trees — and it worked. Then I deleted it, and kept what mattered.
Jul 17, 2026 · 4 min read
The Harness Is the License
A Max subscription token authenticates fine against Anthropic's API and still gets rejected — because the subscription licenses the harness's use of a model on your behalf, not your own direct use of the token.
Jul 20, 2026 · 5 min read
Everything Else Is a Cache
Five real production incidents — lost state, phantom stores, stranded beads — turned out to be one bug wearing different costumes: a bead's address was a filesystem path, not its own identity.
Jul 21, 2026 · 4 min read