Human-in-the-loop AI,
measured properly.

HITL Kit is a design system and component library for teams building agentic products, paired with an open perspective paper on why 95% of enterprise AI fails.

Read the paper Browse components githubakaieuan / HITL-KIT

Most AI systems are evaluated on whether they can complete tasks autonomously. But in deployment, they need to assist humans, not replace them. That mismatch is why 95% of enterprise AI pilots fail.

Assist-Not-Complete is a paradigm for building AI systems that collaborate with humans instead of displacing them.

A paper, and the components that prove it.

IThe paper

An AI Measurement Problem

A perspective piece synthesizing benchmark science, cognitive neuroscience, uncertainty quantification, and enterprise deployment data into the Assist-Not-Complete thesis.

~ 30 min read · 2026

Open

IIThe components

A shadcn-compatible HITL primitive library

Eleven primitives for agentic UIs. Interrupt cards, approve and reject flows, batch queues, subagent states, trace viewers, the AI generation scale. Each one is the physical embodiment of a claim from the paper.

11 primitives · copy-paste · MIT

Open

Eleven canonical HITL interactions.

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Interrupt Card

In-thread approval boundary for agent actions.

Subagent Status

Six discrete execution states for a running agent.

MiniTrace

Collapsible thought, action, result viewer.

AI Generation Scale

Five-segment ordinal of AI vs. human contribution.

Context Chips

Removable pills showing attached notes, files, URLs.

QA Flow

Multi-question approval card for agent-to-human handoff.

Writing Agent

Compound widget for draft-in-progress with status and evidence.

Research Agent

Three modes. Create, follow-up, read URL.

Batch Queue

Sequential resolution of mixed agent items.

Search Result Card

Ranked result with relevance bar and metadata.

Shared Primitives

Accent swatches, approval badges, approve and reject rows.

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Component library

Drops into your existing shadcn/ui setup.

No fork. No vendor lock-in. Same tokens, same Radix primitives, same Tailwind conventions. Every primitive ships as a shadcn registry item. Copy, paste, own.

See all 15 install commands

Install the Interrupt Card

$ npx shadcn@latest add https://www.hitlkit.dev/r/hitl-card.json