Mission Control · API bay · §4.6
Output Schema Designer
Describe the output you want and Haiku will return a tight JSON Schema (draft 2020-12) with short field names, enums, and additionalProperties: false — ready to paste into your Anthropic SDK call.
Free · bring your own key
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This tool runs on your own Anthropic key (BYOK) — Mission Control never bills you for AI. Sign in and add a key to get started.
Sign inWhy a tight schema matters
Short field names save output tokens. "id" vs "identifier" is 1 vs 4 tokens per field per call. At 100k calls/mo with 8 fields, that's ~2.4M tokens of pure waste.
Enums force compliance. "sentiment" as a free string can be "very positive", "mostly positive", "kinda happy" — all variations of the same idea. Enum forces one of {positive|neutral|negative} — cheaper, parseable, no fuzzy matching needed downstream.
additionalProperties: false prevents bloat. Without it the model can invent extra fields that nobody asked for. With it, you get exactly the shape you defined — no surprises in production.
Descriptions are free hints. JSON Schema description fields are sent as inline guidance to the model. Doesn't cost extra output tokens — improves compliance.