# Agent UI

> Agent UI is a portable, runtime-first standard for agent interaction surfaces. It defines how clients project runtime facts into composer, message parts, status, tool UI, task capsules, human-in-the-loop controls, artifact workspaces, timeline evidence, and session surfaces without becoming the execution authority.

Use this file as the concise navigation index for LLMs. Use `llms-full.txt` when a single prompt needs the current core documentation in one markdown file.

## Full context

- [llms-full.txt](https://limecloud.github.io/agentui/llms-full.txt): Concatenated current English documentation with source URLs.

## Primary docs

- [What is Agent UI?](https://limecloud.github.io/agentui/en/what-is-agent-ui): Conceptual entry point and scope.
- [Specification](https://limecloud.github.io/agentui/en/specification): Latest portable Agent UI specification.
- [Quickstart](https://limecloud.github.io/agentui/en/authoring/quickstart): Implementation quickstart.
- [Acceptance scenarios](https://limecloud.github.io/agentui/en/authoring/acceptance-scenarios): Behavior-level validation scenarios.

## Surfaces

- [Composer](https://limecloud.github.io/agentui/en/surfaces/composer): Input composer, attachments, steering, and submission.
- [Message parts](https://limecloud.github.io/agentui/en/surfaces/message-parts): Renderable message part model.
- [Runtime status](https://limecloud.github.io/agentui/en/surfaces/runtime-status): Execution status projection.
- [Tool UI](https://limecloud.github.io/agentui/en/surfaces/tool-ui): Tool call visibility and controls.
- [Task capsule](https://limecloud.github.io/agentui/en/surfaces/task-capsule): Task progress and lifecycle surface.
- [Human-in-the-loop](https://limecloud.github.io/agentui/en/surfaces/human-in-the-loop): Permission and structured input interactions.
- [Artifact Workspace](https://limecloud.github.io/agentui/en/surfaces/artifact-canvas): Artifact reading, preview, edit, and export surface.
- [Timeline and evidence](https://limecloud.github.io/agentui/en/surfaces/timeline-evidence): Timeline, evidence, replay, and review projection.
- [Session and tabs](https://limecloud.github.io/agentui/en/surfaces/session-tabs): Session containers and tab surfaces.

## Contracts

- [Runtime event projection](https://limecloud.github.io/agentui/en/contracts/runtime-event-projection): Mapping runtime facts into UI projections.
- [Backend coordination](https://limecloud.github.io/agentui/en/contracts/backend-coordination): Backend and frontend coordination rules.
- [Performance metrics](https://limecloud.github.io/agentui/en/contracts/performance-metrics): Latency, rendering, and responsiveness metrics.

## Client implementation

- [Runtime standard](https://limecloud.github.io/agentui/en/client-implementation/runtime-standard): How Agent UI consumes runtime standards.
- [Progressive rendering](https://limecloud.github.io/agentui/en/client-implementation/progressive-rendering): Streaming and progressive rendering guidance.
- [Session hydration](https://limecloud.github.io/agentui/en/client-implementation/session-hydration): Recovering sessions from snapshots and history.
- [Queue and steer](https://limecloud.github.io/agentui/en/client-implementation/queue-and-steer): Queue, steering, interruption, and control.

## Reference

- [Glossary](https://limecloud.github.io/agentui/en/reference/glossary): Terms used by the standard.
- [Ecosystem boundaries](https://limecloud.github.io/agentui/en/reference/ecosystem-boundaries): Boundaries with adjacent systems.
- [Research sources](https://limecloud.github.io/agentui/en/reference/research-sources): External sources used to shape the standard.

## Ecosystem

- [Agent standards ecosystem](https://limecloud.github.io/agentui/en/reference/agent-ecosystem): Mutual links across Agent Knowledge, Agent UI, Agent Runtime, Agent Evidence, Agent Policy, Agent Artifact, Agent Tool, and Agent Context.
- [Agent Policy](https://limecloud.github.io/agentpolicy/): Policy decisions, approvals, permissions, risk, retention, waivers, and traces.
- [Agent Artifact](https://limecloud.github.io/agentartifact/): Durable deliverables, versions, parts, previews, exports, and handoff packages.
- [Agent Tool](https://limecloud.github.io/agenttool/): Tool declarations, surfaces, invocations, progress, results, permissions, and audit refs.
- [Agent Context](https://limecloud.github.io/agentcontext/): Context surfaces, items, source refs, selection, budgets, assembly, injection, compaction, and missing-context facts.

## Examples and versions

- [v0.4.8 overview](https://limecloud.github.io/agentui/en/versions/v0.4.8/overview): Latest released version overview.
- [v0.4.8 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.8/specification): Latest released specification snapshot.
- [v0.4.7 overview](https://limecloud.github.io/agentui/en/versions/v0.4.7/overview): Latest released version overview.
- [v0.4.7 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.7/specification): Latest released specification snapshot.
- [v0.4.6 overview](https://limecloud.github.io/agentui/en/versions/v0.4.6/overview): Previous released version overview.
- [v0.4.6 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.6/specification): Previous released specification snapshot.
- [v0.4.5 overview](https://limecloud.github.io/agentui/en/versions/v0.4.5/overview): Previous released version overview.
- [v0.4.5 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.5/specification): Previous released specification snapshot.
- [Basic agent workbench](https://limecloud.github.io/agentui/en/examples/basic-agent-workbench): Reference workbench example.
- [v0.4.4 overview](https://limecloud.github.io/agentui/en/versions/v0.4.4/overview): Previous released version overview.
- [v0.4.4 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.4/specification): Previous released specification snapshot.
- [v0.4.3 overview](https://limecloud.github.io/agentui/en/versions/v0.4.3/overview): Previous released version overview.
- [v0.4.3 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.3/specification): Previous released specification snapshot.
- [v0.4.2 overview](https://limecloud.github.io/agentui/en/versions/v0.4.2/overview): Previous released version overview.
- [v0.4.2 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.2/specification): Previous released specification snapshot.
- [v0.4.1 overview](https://limecloud.github.io/agentui/en/versions/v0.4.1/overview): Previous released version overview.
- [v0.4.1 specification snapshot](https://limecloud.github.io/agentui/en/versions/v0.4.1/specification): Previous released specification snapshot.

## Schemas

- [Agent UI event schema](https://limecloud.github.io/agentui/schemas/agentui-event.schema.json): Public event schema.

## Language mirrors

- Chinese documentation is available under `/zh/` with matching page structure where translated pages exist.