Build PAA / Patterns

Five reference flows

These five patterns cover common task shapes. Match your task to the shape, then adapt the boundary, evaluator, promotion rule, and fallback to your domain.

Stacked semantic review

PR review agent

Best for: merge safety
Worker: LLM + tools
Evaluator: Deterministic tests and lint run first, then an LLM judge handles the semantic call the deterministic layer cannot make.
Target: output
Risk: medium / technically reversible, operationally costly
Trajectory: HITL → HOTL

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Selective autonomy classifier

Refund approval agent

Best for: selective autonomy
Worker: Rules, classifier, or LLM depending on the implementation.
Evaluator: Learned escalation classifier trained on accumulated human decisions and tuned for escalation recall.
Target: output
Risk: medium / partly reversible
Trajectory: HITL → AUTONOMOUS

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Non-generative classification pipeline

Document routing

Best for: low-risk classifier autonomy
Worker: A routing classifier with no generative model in the loop.
Evaluator: Schema validation, out-of-distribution detection, and low-confidence escalation in flight, with downstream reroute monitoring behind the scenes.
Target: input and output
Risk: low / reversible
Trajectory: HITL → AUTONOMOUS

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Irreversible action gate

Transaction / trade execution gate

Best for: irreversible action control
Worker: Upstream automation proposes the transaction or trade.
Evaluator: Position limits, price bounds, whitelists, and kill-switch conditions gate the action. Model signals remain advisory only.
Target: output and outcome
Risk: catastrophic / irreversible
Trajectory: HITL

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Evaluator maturity pipeline

Support response agent

Best for: evaluator maturity
Worker: The LLM that drafts the response.
Evaluator: LLM judge first, then a classifier distilled from the judge's labels once enough examples accumulate.
Target: output
Risk: low-medium / reversible
Trajectory: HITL → HOTL

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Together they cover generative and non-generative workers, reversible and irreversible actions, selective autonomy, permanent gates, and evaluator maturation.