Add AGUIMock — AG-UI protocol mock#100
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All 33 AG-UI event types, 11 convenience builders, fluent registration API, SSE streaming with disconnect handling, and record/replay with tee streaming and proxy-only mode.
32 unit tests (core, builders, edge cases, record/replay) plus 8 schema drift tests comparing against canonical @ag-ui/core Zod schemas.
New AGUIMock docs page. Remove section bar from all pages (dead code). Update homepage feature grid and competitive matrix with AG-UI. Add AG-UI schema drift CI workflow.
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## Summary
- New `AGUIMock` class implementing the AG-UI (Agent-to-UI) protocol —
the SSE event streaming protocol CopilotKit uses between agents and the
frontend
- All 33 AG-UI event types supported (lifecycle, text, tool calls,
state, activity, reasoning, special, deprecated)
- 11 event builder functions for common patterns (text response, tool
call, state update, reasoning, activity, etc.)
- Fluent registration API: `onMessage()`, `onRun()`, `onToolCall()`,
`onStateKey()`, `onReasoning()`, `onPredicate()`
- Record & replay with tee streaming — proxy to real AG-UI agents,
record event streams as fixtures, replay on subsequent requests
- Proxy-only mode (`--agui-proxy-only`) — forward without saving or
caching
- Standalone and mountable modes (mount at `/agui` on LLMock)
- Config file, suite, and CLI support (`--agui-record`,
`--agui-upstream`, `--agui-proxy-only`)
## Use case
Frontend developers can test CopilotKit UI components without a running
agent backend. Point the frontend at aimock's `/agui` endpoint and get
deterministic AG-UI event streams from fixtures. For demos, use
proxy-only mode with canned fixtures for repeatable scenarios while
proxying unknown traffic to the real agent.
```ts
const agui = new AGUIMock();
agui.onMessage("hello", "Hi! How can I help?");
agui.onToolCall(/search/, "web_search", '{"q":"test"}', { result: "[]" });
agui.enableRecording({ upstream: "http://localhost:8000/agent", proxyOnly: true });
const llm = new LLMock();
llm.mount("/agui", agui);
await llm.start();
```
## New files
- `src/agui-types.ts` — 33 event type definitions, fixture/match types
- `src/agui-handler.ts` — matching, 11 builders, SSE writer
- `src/agui-mock.ts` — AGUIMock class (Mountable)
- `src/agui-recorder.ts` — record/replay with tee streaming, proxy-only
mode
- `src/agui-stub.ts` — barrel exports
- `src/__tests__/agui-mock.test.ts` — 32 tests
## Modified files
- `src/config-loader.ts` — AGUIConfig support
- `src/suite.ts` — agui option in MockSuite
- `src/index.ts` — AG-UI exports
- `src/cli.ts` — AG-UI recording flags
## Test plan
- [x] 32 new tests (core 14, builders 5, edge cases 7, record/replay 6)
- [x] All 2246 tests pass
- [x] Build passes
- [x] 3-round CR loop converged at 0 findings
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Summary
AGUIMockclass implementing the AG-UI (Agent-to-UI) protocol — the SSE event streaming protocol CopilotKit uses between agents and the frontendonMessage(),onRun(),onToolCall(),onStateKey(),onReasoning(),onPredicate()--agui-proxy-only) — forward without saving or caching/aguion LLMock)--agui-record,--agui-upstream,--agui-proxy-only)Use case
Frontend developers can test CopilotKit UI components without a running agent backend. Point the frontend at aimock's
/aguiendpoint and get deterministic AG-UI event streams from fixtures. For demos, use proxy-only mode with canned fixtures for repeatable scenarios while proxying unknown traffic to the real agent.New files
src/agui-types.ts— 33 event type definitions, fixture/match typessrc/agui-handler.ts— matching, 11 builders, SSE writersrc/agui-mock.ts— AGUIMock class (Mountable)src/agui-recorder.ts— record/replay with tee streaming, proxy-only modesrc/agui-stub.ts— barrel exportssrc/__tests__/agui-mock.test.ts— 32 testsModified files
src/config-loader.ts— AGUIConfig supportsrc/suite.ts— agui option in MockSuitesrc/index.ts— AG-UI exportssrc/cli.ts— AG-UI recording flagsTest plan
🤖 Generated with Claude Code