feat(rpc): expose token throughput in state

packages/coding-agent/src/modes/rpc/rpc-mode.ts

@@ -32,6 +32,7 @@ import { executeAcpBuiltinSlashCommand } from "../../slash-commands/acp-builtins
 import { buildAvailableSlashCommands } from "../../slash-commands/available-commands";
 import { defaultLoadModeForToolName } from "../../tools/essential-tools";
 import type { EventBus } from "../../utils/event-bus";
+import { calculateTokensPerSecond } from "../../utils/token-rate";
 import { initializeExtensions } from "../runtime-init";
 import { isRpcHostToolResult, isRpcHostToolUpdate, RpcHostToolBridge } from "./host-tools";
 import { isRpcHostUriResult, RpcHostUriBridge } from "./host-uris";
@@ -1087,6 +1088,7 @@ export async function runRpcMode(
 					queuedMessageCount: session.queuedMessageCount,
 					todoPhases: session.getTodoPhases(),
 					fastModeEnabled: session.isFastModeEnabled(),
+					tokensPerSecond: calculateTokensPerSecond(session.messages, session.isStreaming),
 					fastModeActive: session.isFastModeActive(),
 					messageCount: session.messages.length,
 					systemPrompt: session.systemPrompt,

packages/coding-agent/src/modes/rpc/rpc-types.ts

@@ -110,6 +110,7 @@ export interface RpcSessionState {
 	autoCompactionEnabled: boolean;
 	fastModeEnabled: boolean;
 	fastModeActive: boolean;
+	tokensPerSecond: number | null;
 	messageCount: number;
 	queuedMessageCount: number;
 	todoPhases: TodoPhase[];

packages/coding-agent/test/rpc-input-frame.test.ts

@@ -326,6 +326,7 @@ describe("RpcInputDispatcher", () => {
 						autoCompactionEnabled: false,
 						fastModeEnabled: false,
 						fastModeActive: false,
+						tokensPerSecond: null,
 						messageCount: 0,
 						queuedMessageCount: 0,
 						todoPhases: [],

packages/coding-agent/test/rpc.test.ts

@@ -59,6 +59,7 @@ describe.skipIf(!e2eApiKey("ANTHROPIC_API_KEY"))("RPC mode", () => {
 		expect(state.model?.id).toBe("claude-sonnet-4-5");
 		expect(state.isStreaming).toBe(false);
 		expect(state.messageCount).toBe(0);
+		expect(state.tokensPerSecond).toBeNull();
 	}, 30000);
 
 	test("should set fast mode and expose enabled/active state", async () => {