Events reference

Events are the real-time signal stream for a run. They appear in the run detail view and feed into alerts and reports.

Emit events via run.emit(type, payload, level) or the built-in helpers.

Event levels

Level	When to use
`debug`	Verbose tracing, internal state
`info`	Normal progress (default)
`warn`	Something unexpected but recoverable
`error`	A failure occurred

Built-in event types

These types are understood by AgentOS and rendered with dedicated UI in the run detail view.

LLM events

run.emitLLMRequest("claude-sonnet-4-6", "Summarise this document...");
run.emitLLMResponse("claude-sonnet-4-6", "The document covers...", {
  inputTokens: 512,
  outputTokens: 128,
});

Type	Payload fields
`llm.request`	`model`, `prompt`, any extras
`llm.response`	`model`, `response`, `input_tokens?`, `output_tokens?`

Tool events

run.emitToolCall("search_web", { query: "latest AI news" });
run.emitToolReturn("search_web", { results: [...] });
run.emitToolError("search_web", "Timeout after 5s");

Type	Payload fields
`tool.called`	`tool`, `input`
`tool.returned`	`tool`, `output`
`tool.failed`	`tool`, `error`

Custom event types

Use any dot-separated string as a type. Convention: noun.verb.

run.emit("invoice.validated", { invoiceId: "INV-001", amount: 1250.00 });
run.emit("retry.attempted", { attempt: 2, maxAttempts: 3 }, "warn");
run.emit("external_api.failed", { endpoint: "/payments", status: 503 }, "error");

Good naming examples:

document.parsed
step.started / step.completed
cache.hit / cache.miss
approval.requested

Event batching

Events are buffered client-side and flushed every 500ms or when the batch reaches 50 events. You don't need to manage this — run.complete() and run.fail() always flush before closing the run.

Call run.flush() explicitly if you need to force a flush mid-run (e.g. before a long blocking operation).