test(openrouter): re-add streaming payload test for parameterless tools (prism-php#1004)

Replaces the unrunnable test dropped in 5c08d92: this one ships a real
two-response SSE fixture and consumes the stream before asserting the
request payload omits the parameters key for a parameterless tool.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: wishborn

tests/Fixtures/openrouter/stream-text-with-parameterless-tool-1.sse

@@ -0,0 +1,18 @@
+data: {"id":"gen-1760518100-Kp3RtWnYxQBA2SAbiPRM","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518100,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+: OPENROUTER PROCESSING
+
+: OPENROUTER PROCESSING
+
+data: {"id":"gen-1760518100-Kp3RtWnYxQBA2SAbiPRM","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518100,"choices":[{"index":0,"delta":{"role":"assistant","content":null,"tool_calls":[{"id":"call_ZQpWJRxU5EIprhJ4cpxTMkNr","index":0,"type":"function","function":{"name":"time","arguments":""}}]},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518100-Kp3RtWnYxQBA2SAbiPRM","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518100,"choices":[{"index":0,"delta":{"role":"assistant","content":null,"tool_calls":[{"index":0,"type":"function","function":{"arguments":"{}"}}]},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+: OPENROUTER PROCESSING
+
+data: {"id":"gen-1760518100-Kp3RtWnYxQBA2SAbiPRM","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518100,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":"tool_calls","native_finish_reason":"completed","logprobs":null}]}
+
+data: {"id":"gen-1760518100-Kp3RtWnYxQBA2SAbiPRM","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518100,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null,"native_finish_reason":null,"logprobs":null}],"usage":{"prompt_tokens":58,"completion_tokens":21,"total_tokens":79,"cost":0.0003825,"is_byok":false,"prompt_tokens_details":{"cached_tokens":0,"audio_tokens":0},"cost_details":{"upstream_inference_cost":null,"upstream_inference_prompt_cost":0.0000725,"upstream_inference_completions_cost":0.00031},"completion_tokens_details":{"reasoning_tokens":0,"image_tokens":0}}}
+
+data: [DONE]
+

tests/Fixtures/openrouter/stream-text-with-parameterless-tool-2.sse

@@ -0,0 +1,34 @@
+: OPENROUTER PROCESSING
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":"The"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":" current"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":" time"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":" is"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":" "},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":"08"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":":"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":"00"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":":"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":"00"},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":"."},"finish_reason":null,"native_finish_reason":null,"logprobs":null}]}
+
+: OPENROUTER PROCESSING
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":"stop","native_finish_reason":"completed","logprobs":null}]}
+
+data: {"id":"gen-1760518110-Vw82mQtRc4L9nYhuiWx1","provider":"OpenAI","model":"openai/gpt-5","object":"chat.completion.chunk","created":1760518110,"choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null,"native_finish_reason":null,"logprobs":null}],"usage":{"prompt_tokens":86,"completion_tokens":13,"total_tokens":99,"cost":0.0002375,"is_byok":false,"prompt_tokens_details":{"cached_tokens":0,"audio_tokens":0},"cost_details":{"upstream_inference_cost":null,"upstream_inference_prompt_cost":0.0001075,"upstream_inference_completions_cost":0.00013},"completion_tokens_details":{"reasoning_tokens":0,"image_tokens":0}}}
+
+data: [DONE]
+

tests/Providers/OpenRouter/StreamTest.php

@@ -248,6 +248,63 @@
     expect($streamEndEvents)->not->toBeEmpty();
 });
 
+it('sends correct tool payload when streaming with a parameterless tool', function (): void {
+    FixtureResponse::fakeStreamResponses('v1/chat/completions', 'openrouter/stream-text-with-parameterless-tool');
+
+    $currentTime = '08:00:00';
+
+    $timeTool = Tool::as('time')
+        ->for('Get the current time')
+        ->using(fn (): string => $currentTime);
+
+    $searchTool = Tool::as('search')
+        ->for('Search the web')
+        ->withStringParameter('query', 'the search query')
+        ->using(fn (string $query): string => 'results');
+
+    $response = Prism::text()
+        ->using(Provider::OpenRouter, 'openai/gpt-5')
+        ->withTools([$timeTool, $searchTool])
+        ->withMaxSteps(3)
+        ->withPrompt('What time is it?')
+        ->asStream();
+
+    $text = '';
+    $toolCallEvents = [];
+
+    foreach ($response as $event) {
+        if ($event instanceof TextDeltaEvent) {
+            $text .= $event->delta;
+        }
+
+        if ($event instanceof ToolCallEvent) {
+            $toolCallEvents[] = $event;
+        }
+    }
+
+    expect($toolCallEvents)->toHaveCount(1);
+    expect($toolCallEvents[0]->toolCall->name)->toBe('time');
+    expect($toolCallEvents[0]->toolCall->arguments())->toBe([]);
+    expect($text)->toContain('The current time is '.$currentTime);
+
+    Http::assertSent(function (Request $request): bool {
+        $tools = $request->data()['tools'];
+
+        // Tool without parameters: no 'parameters' key in function
+        $timeFunction = $tools[0]['function'];
+        expect($timeFunction['name'])->toBe('time');
+        expect($timeFunction)->not->toHaveKey('parameters');
+
+        // Tool with parameters keeps its 'parameters' key
+        $searchFunction = $tools[1]['function'];
+        expect($searchFunction['name'])->toBe('search');
+        expect($searchFunction)->toHaveKey('parameters');
+        expect($searchFunction['parameters']['properties'])->toHaveKey('query');
+
+        return true;
+    });
+});
+
 it('can handle reasoning/thinking tokens in streaming', function (): void {
     FixtureResponse::fakeStreamResponses('v1/chat/completions', 'openrouter/stream-text-with-reasoning');