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outlines-library

Constrain LLM generation to exact structures with Outlines — regex, JSON schema, and grammar-guided decoding.

skills/outlines-library/SKILL.md

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## Overview

Outlines controls what a language model is allowed to generate at the token
level. Instead of asking for JSON and hoping, you give Outlines a schema (JSON
schema, regex, or context-free grammar) and it constrains decoding so every
output is valid by construction — invalid tokens are masked out during
generation. The difference from post-hoc validation is fundamental: Outlines
can't produce invalid output, so there's no retry loop, no parse failures, and no
wasted tokens on doomed generations.

This is the right tool when structure is non-negotiable: strict JSON APIs,
domain-specific languages, formatted outputs (dates, codes, enums), and anywhere
downstream code parses the result. It trades some flexibility (constrained
decoding adds per-step overhead and needs logits access, so it works with