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Note

Trust boundaries are easier to review than policy language.

The shape of the boundary is easier to reason about than the policy layered on top of it.

Context

When a system is hard to review, it usually means the boundary is buried under a policy layer that mixes trust, transport, and product logic together.

I prefer to surface the boundary first: who can influence the input, where the decision is made, and which claims can actually be verified later.

Once that is clear, the policy becomes much easier to read because the failure states have somewhere to live.

Takeaways

01

Make the decision surface explicit.

02

Keep policy separate from the trust boundary itself.

03

Review the failure state before the happy path.

Entry

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