fix: add finish_reason processing to xai.ts provider (#9929)

src/api/providers/__tests__/xai.spec.ts

@@ -495,5 +495,87 @@ describe("XAIHandler", () => {
 				}),
 			)
 		})
+
+		it("should yield tool_call_end events when finish_reason is tool_calls", async () => {
+			// Import NativeToolCallParser to set up state
+			const { NativeToolCallParser } = await import("../../../core/assistant-message/NativeToolCallParser")
+
+			// Clear any previous state
+			NativeToolCallParser.clearRawChunkState()
+
+			const handlerWithTools = new XAIHandler({ apiModelId: "grok-3" })
+
+			mockCreate.mockImplementationOnce(() => {
+				return {
+					[Symbol.asyncIterator]: () => ({
+						next: vi
+							.fn()
+							.mockResolvedValueOnce({
+								done: false,
+								value: {
+									choices: [
+										{
+											delta: {
+												tool_calls: [
+													{
+														index: 0,
+														id: "call_xai_test",
+														function: {
+															name: "test_tool",
+															arguments: '{"arg1":"value"}',
+														},
+													},
+												],
+											},
+										},
+									],
+								},
+							})
+							.mockResolvedValueOnce({
+								done: false,
+								value: {
+									choices: [
+										{
+											delta: {},
+											finish_reason: "tool_calls",
+										},
+									],
+									usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+								},
+							})
+							.mockResolvedValueOnce({ done: true }),
+					}),
+				}
+			})
+
+			const stream = handlerWithTools.createMessage("test prompt", [], {
+				taskId: "test-task-id",
+				tools: testTools,
+				toolProtocol: "native",
+			})
+
+			const chunks = []
+			for await (const chunk of stream) {
+				// Simulate what Task.ts does: when we receive tool_call_partial,
+				// process it through NativeToolCallParser to populate rawChunkTracker
+				if (chunk.type === "tool_call_partial") {
+					NativeToolCallParser.processRawChunk({
+						index: chunk.index,
+						id: chunk.id,
+						name: chunk.name,
+						arguments: chunk.arguments,
+					})
+				}
+				chunks.push(chunk)
+			}
+
+			// Should have tool_call_partial and tool_call_end
+			const partialChunks = chunks.filter((chunk) => chunk.type === "tool_call_partial")
+			const endChunks = chunks.filter((chunk) => chunk.type === "tool_call_end")
+
+			expect(partialChunks).toHaveLength(1)
+			expect(endChunks).toHaveLength(1)
+			expect(endChunks[0].id).toBe("call_xai_test")
+		})
 	})
 })

src/api/providers/xai.ts

@@ -3,6 +3,7 @@ import OpenAI from "openai"
 
 import { type XAIModelId, xaiDefaultModelId, xaiModels } from "@roo-code/types"
 
+import { NativeToolCallParser } from "../../core/assistant-message/NativeToolCallParser"
 import type { ApiHandlerOptions } from "../../shared/api"
 
 import { ApiStream } from "../transform/stream"
@@ -83,6 +84,7 @@ export class XAIHandler extends BaseProvider implements SingleCompletionHandler
 
 		for await (const chunk of stream) {
 			const delta = chunk.choices[0]?.delta
+			const finishReason = chunk.choices[0]?.finish_reason
 
 			if (delta?.content) {
 				yield {
@@ -111,6 +113,15 @@ export class XAIHandler extends BaseProvider implements SingleCompletionHandler
 				}
 			}
 
+			// Process finish_reason to emit tool_call_end events
+			// This ensures tool calls are finalized even if the stream doesn't properly close
+			if (finishReason) {
+				const endEvents = NativeToolCallParser.processFinishReason(finishReason)
+				for (const event of endEvents) {
+					yield event
+				}
+			}
+
 			if (chunk.usage) {
 				// Extract detailed token information if available
 				// First check for prompt_tokens_details structure (real API response)