Notes

Long-form writing on the parts that survive real usage. Published here first, syndicated after.

• July 28, 20262 min read

  I built the approval gate, then put a price on it

  In ledgerloop, a clean invoice under $1,000 posts with no human involved. I built the approval gate, then put a price on it.

  • fintech
  • ap-automation
  • agents
  • controls

• July 27, 20262 min read

  One pass of my eval bills $9.14 on the API and $0 through the CLI

  One pass of my board eval bills $9.14 on the Anthropic API. Through Claude Code it bills $0. Same model, claude-opus-4-8.

  • ai
  • evals
  • claude
  • tooling

• July 16, 20263 min read

  Enterprise fintech deals die in onboarding, and the config already exists

  Enterprise fintech deals don't die in the demo. They die in week six of onboarding, while someone re-types the customer's approval rules into a canvas.

  • fintech
  • onboarding
  • procure-to-pay
  • ai

• July 12, 20266 min read

  A rulebook of how money code breaks, and an agent that refutes its own findings

  Money bugs are rare per repository and expensive when they happen. They also pass review, because the code compiles and the tests pass, and the tests pass precisely because they use round numbers and one currency.

  • fintech
  • code-review
  • agents
  • typescript

• July 10, 20262 min read

  "It's just an approval workflow" is the most expensive sentence in procurement software

  In the demo, it's three boxes: request, manager, CFO. Everyone nods. Then production shows up with questions the canvas never asked.

  • procure-to-pay
  • workflow-engine
  • fintech
  • product

• July 6, 20265 min read

  The hard part of an AI feature is knowing where NOT to use AI

  A payment decision has to be exact and repeatable. So in the product I built, the money logic is deterministic code, and the agent only touches the parts where judgement is genuinely open-ended.

  • ai
  • fintech
  • agents
  • procure-to-pay

• July 6, 20265 min read

  React Flow auto layout with dagre for custom, variable-size nodes

  Variable-size nodes break dagre's centering, first paint flickers, and straight chains render with kinked edges. Here is the why and the fix for each.

  • react-flow
  • dagre
  • layout
  • typescript