[Firebase AI] URL Context tool intermittently throws 500 errors on Google AI

[andrewheard]

Description

Using the URL Context tool with the Gemini Developer API (Google AI) frequently results in HTTP 500 errors from the backend.

Reproducing the issue

The integration test intermittently fails:

firebase-ios-sdk/FirebaseAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

Lines 427 to 452 in 541ac34

	@Test(
	"generateContent with URL Context",
	arguments: InstanceConfig.allConfigs
	)
	func generateContent_withURLContext_succeeds(_ config: InstanceConfig) async throws {
	let model = FirebaseAI.componentInstance(config).generativeModel(
	modelName: ModelNames.gemini2_5_Flash,
	tools: [.urlContext()]
	)
	let prompt = """
	Write a one paragraph summary of this blog post: \
	https://developers.googleblog.com/en/introducing-gemma-3-270m/
	"""
	let response = try await model.generateContent(prompt)
	let candidate = try #require(response.candidates.first)
	let urlContextMetadata = try #require(candidate.urlContextMetadata)
	#expect(urlContextMetadata.urlMetadata.count == 1)
	let urlMetadata = try #require(urlContextMetadata.urlMetadata.first)
	let retrievedURL = try #require(urlMetadata.retrievedURL)
	#expect(
	retrievedURL == URL(string: "https://developers.googleblog.com/en/introducing-gemma-3-270m/")
	)
	#expect(urlMetadata.retrievalStatus == .success)
	}

Firebase SDK Version

12.4.0

Xcode Version

26.0

Installation Method

Swift Package Manager

Firebase Product(s)

AI Logic

Targeted Platforms

All

Relevant Log Output

If using Swift Package Manager, the project's Package.resolved

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If using CocoaPods, the project's Podfile.lock

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