SkillsMay 11, 2026·2 min read

TypeChat — Schema-First Natural Language UIs

Build typed natural language interfaces by turning intent into validated JSON via TypeScript types. Replace prompt engineering with schema engineering.

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Native · 98/100Policy: allow
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Trust: Established
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Direct install command
npx -y tokrepo@latest install 6722eee5-8afd-4e50-9259-3a3ceb67e74f --target codex

Run after dry-run confirms the install plan.

Intro

Build typed natural language interfaces by turning intent into validated JSON via TypeScript types. Replace prompt engineering with schema engineering.

  • Best for: Product teams who need typed actions (APIs, workflows) from an LLM with validation and repair loops
  • Works with: TypeScript/JavaScript, any LLM backend, JSON schema-style validation flows
  • Setup time: 12 minutes

Quantitative Notes

  • Setup time ~12 minutes (npm install + run one example in the repo)
  • GitHub stars + forks (verified): see Source & Thanks
  • Typical loop: generate JSON → validate → repair (1–2 retries)

Practical Notes

If you’re building an agent that triggers actions, define a narrow union type for allowed intents and keep each intent payload minimal. Add deterministic validation (schema + business rules) and log all repairs—repairs are where many hidden bugs appear. Over time, grow the schema set rather than growing prompts.

Safety note: Always validate typed JSON with business rules (not just schema) before executing real actions.

FAQ

Q: Do I still need prompt engineering? A: Much less. You focus on defining types/schemas; prompts become smaller and more stable.

Q: How does it handle invalid JSON? A: It validates and can re-prompt the model to repair non-conforming output.

Q: Is it only for TypeScript apps? A: TypeChat provides TypeScript/JS support, and the repo also references other language variants.

🙏

Source & Thanks

GitHub: https://github.com/microsoft/TypeChat Owner avatar: https://avatars.githubusercontent.com/u/6154722?v=4 License (SPDX): MIT GitHub stars (verified via api.github.com/repos/microsoft/TypeChat): 8,652 GitHub forks (verified via api.github.com/repos/microsoft/TypeChat): 413

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