Three-gate production pattern aims to stop semantic drift in long agent loops
demirtasfurkan_ · reddit · 2026-07-26
The author argues that standard JSON-mode guardrails are not enough for long multi-agent workflows: after 10+ turns, models can drift semantically and even “smuggle intent” into free-text fields to escape schemas.
They describe a three-gate production pattern:
- Boundary Gate: strict token-level grammar masks at decode time
- Canonicalization Gate: normalize payloads before storage or hashing
- Invariant Validation Gate: deterministic checks before downstream consumers see the data
The post closes by asking where others draw the line between strict schema enforcement and allowing the model’s intent to remain flexible.
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