1 files changed, 57 insertions, 0 deletions
diff --git a/packages/kernel/src/runtime/events.ts b/packages/kernel/src/runtime/events.ts
new file mode 100644
index 0000000..62218be
--- /dev/null
+++ b/packages/kernel/src/runtime/events.ts
@@ -0,0 +1,57 @@
+import type { AgentEvent } from "../contracts/events.js";
+import type { Usage } from "../contracts/provider.js";
+
+export function textDeltaEvent(tabId: string, turnId: string, delta: string): AgentEvent {
+	return { type: "text-delta", tabId, turnId, delta };
+}
+
+export function reasoningDeltaEvent(tabId: string, turnId: string, delta: string): AgentEvent {
+	return { type: "reasoning-delta", tabId, turnId, delta };
+}
+
+export function toolCallEvent(
+	tabId: string,
+	turnId: string,
+	toolCallId: string,
+	toolName: string,
+	input: unknown,
+): AgentEvent {
+	return { type: "tool-call", tabId, turnId, toolCallId, toolName, input };
+}
+
+export function toolResultEvent(
+	tabId: string,
+	turnId: string,
+	toolCallId: string,
+	toolName: string,
+	content: string,
+	isError: boolean,
+): AgentEvent {
+	return { type: "tool-result", tabId, turnId, toolCallId, toolName, content, isError };
+}
+
+export function toolOutputEvent(
+	tabId: string,
+	turnId: string,
+	toolCallId: string,
+	data: string,
+	stream: "stdout" | "stderr",
+): AgentEvent {
+	return { type: "tool-output", tabId, turnId, toolCallId, data, stream };
+}
+
+export function usageEvent(tabId: string, turnId: string, usage: Usage): AgentEvent {
+	return { type: "usage", tabId, turnId, usage };
+}
+
+export function errorEvent(
+	tabId: string,
+	turnId: string,
+	message: string,
+	code?: string,
+): AgentEvent {
+	if (code !== undefined) {
+		return { type: "error", tabId, turnId, message, code };
+	}
+	return { type: "error", tabId, turnId, message };
+}