fix(ollama): add logging and diagnostics for debugging Ollama connection issues

- Add logging when models are filtered out due to missing tool support
- Add warning when selected model is not in the tool-capable models list
- Update parseOllamaModel to return filteredReason for better diagnostics
- Log request info (model ID, base URL) when starting Ollama requests

This helps diagnose issues like #11049 where Ollama models appear
unresponsive. The logging output will show:
- Which models are being filtered and why
- When a model may not support native tool calling
- Request details for debugging connectivity issues

src/api/providers/fetchers/__tests__/ollama.test.ts

@@ -15,9 +15,9 @@ describe("Ollama Fetcher", () => {
 	describe("parseOllamaModel", () => {
 		it("should correctly parse Ollama model info", () => {
 			const modelData = ollamaModelsData["qwen3-2to16:latest"]
-			const parsedModel = parseOllamaModel(modelData)
+			const { modelInfo } = parseOllamaModel(modelData)
 
-			expect(parsedModel).toEqual({
+			expect(modelInfo).toEqual({
 				maxTokens: 40960,
 				contextWindow: 40960,
 				supportsImages: false,
@@ -39,9 +39,9 @@ describe("Ollama Fetcher", () => {
 				},
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithNullFamilies as any)
+			const { modelInfo } = parseOllamaModel(modelDataWithNullFamilies as any)
 
-			expect(parsedModel).toEqual({
+			expect(modelInfo).toEqual({
 				maxTokens: 40960,
 				contextWindow: 40960,
 				supportsImages: false,
@@ -54,16 +54,18 @@ describe("Ollama Fetcher", () => {
 			})
 		})
 
-		it("should return null when capabilities does not include 'tools'", () => {
+		it("should return null with reason when capabilities does not include 'tools'", () => {
 			const modelDataWithoutTools = {
 				...ollamaModelsData["qwen3-2to16:latest"],
 				capabilities: ["completion"], // No "tools" capability
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithoutTools as any)
+			const { modelInfo, filteredReason } = parseOllamaModel(modelDataWithoutTools as any, "test-model")
 
 			// Models without tools capability are filtered out (return null)
-			expect(parsedModel).toBeNull()
+			expect(modelInfo).toBeNull()
+			expect(filteredReason).toContain("test-model")
+			expect(filteredReason).toContain("do not include 'tools'")
 		})
 
 		it("should return model info when capabilities includes 'tools'", () => {
@@ -72,22 +74,25 @@ describe("Ollama Fetcher", () => {
 				capabilities: ["completion", "tools"], // Has "tools" capability
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithTools as any)
+			const { modelInfo, filteredReason } = parseOllamaModel(modelDataWithTools as any)
 
-			expect(parsedModel).not.toBeNull()
-			expect(parsedModel!.contextWindow).toBeGreaterThan(0)
+			expect(modelInfo).not.toBeNull()
+			expect(modelInfo!.contextWindow).toBeGreaterThan(0)
+			expect(filteredReason).toBeUndefined()
 		})
 
-		it("should return null when capabilities is undefined (no tool support)", () => {
+		it("should return null with reason when capabilities is undefined (no tool support)", () => {
 			const modelDataWithoutCapabilities = {
 				...ollamaModelsData["qwen3-2to16:latest"],
 				capabilities: undefined, // No capabilities array
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithoutCapabilities as any)
+			const { modelInfo, filteredReason } = parseOllamaModel(modelDataWithoutCapabilities as any, "test-model")
 
 			// Models without explicit tools capability are filtered out
-			expect(parsedModel).toBeNull()
+			expect(modelInfo).toBeNull()
+			expect(filteredReason).toContain("test-model")
+			expect(filteredReason).toContain("no capabilities reported")
 		})
 
 		it("should return null when model has vision but no tools capability", () => {
@@ -96,10 +101,10 @@ describe("Ollama Fetcher", () => {
 				capabilities: ["completion", "vision"],
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithVision as any)
+			const { modelInfo } = parseOllamaModel(modelDataWithVision as any)
 
 			// No "tools" capability means filtered out
-			expect(parsedModel).toBeNull()
+			expect(modelInfo).toBeNull()
 		})
 
 		it("should return model with both vision and tools when both capabilities present", () => {
@@ -108,11 +113,11 @@ describe("Ollama Fetcher", () => {
 				capabilities: ["completion", "vision", "tools"],
 			}
 
-			const parsedModel = parseOllamaModel(modelDataWithBoth as any)
+			const { modelInfo } = parseOllamaModel(modelDataWithBoth as any)
 
-			expect(parsedModel).not.toBeNull()
-			expect(parsedModel!.supportsImages).toBe(true)
-			expect(parsedModel!.contextWindow).toBeGreaterThan(0)
+			expect(modelInfo).not.toBeNull()
+			expect(modelInfo!.supportsImages).toBe(true)
+			expect(modelInfo!.contextWindow).toBeGreaterThan(0)
 		})
 	})
 
@@ -177,7 +182,7 @@ describe("Ollama Fetcher", () => {
 			expect(Object.keys(result).length).toBe(1)
 			expect(result[modelName]).toBeDefined()
 
-			const expectedParsedDetails = parseOllamaModel(mockApiShowResponse as any)
+			const { modelInfo: expectedParsedDetails } = parseOllamaModel(mockApiShowResponse as any)
 			expect(result[modelName]).toEqual(expectedParsedDetails)
 		})
 

src/api/providers/fetchers/ollama.ts

@@ -37,7 +37,10 @@ type OllamaModelsResponse = z.infer<typeof OllamaModelsResponseSchema>
 
 type OllamaModelInfoResponse = z.infer<typeof OllamaModelInfoResponseSchema>
 
-export const parseOllamaModel = (rawModel: OllamaModelInfoResponse): ModelInfo | null => {
+export const parseOllamaModel = (
+	rawModel: OllamaModelInfoResponse,
+	modelName?: string,
+): { modelInfo: ModelInfo | null; filteredReason?: string } => {
 	const contextKey = Object.keys(rawModel.model_info).find((k) => k.includes("context_length"))
 	const contextWindow =
 		contextKey && typeof rawModel.model_info[contextKey] === "number" ? rawModel.model_info[contextKey] : undefined
@@ -45,7 +48,10 @@ export const parseOllamaModel = (rawModel: OllamaModelInfoResponse): ModelInfo |
 	// Filter out models that don't support tools. Models without tool capability won't work.
 	const supportsTools = rawModel.capabilities?.includes("tools") ?? false
 	if (!supportsTools) {
-		return null
+		const reason = rawModel.capabilities
+			? `Model '${modelName || "unknown"}' capabilities (${rawModel.capabilities.join(", ")}) do not include 'tools'`
+			: `Model '${modelName || "unknown"}' has no capabilities reported (Ollama may need to be updated)`
+		return { modelInfo: null, filteredReason: reason }
 	}
 
 	const modelInfo: ModelInfo = Object.assign({}, ollamaDefaultModelInfo, {
@@ -56,7 +62,7 @@ export const parseOllamaModel = (rawModel: OllamaModelInfoResponse): ModelInfo |
 		maxTokens: contextWindow || ollamaDefaultModelInfo.contextWindow,
 	})
 
-	return modelInfo
+	return { modelInfo }
 }
 
 export async function getOllamaModels(
@@ -84,6 +90,8 @@ export async function getOllamaModels(
 		let modelInfoPromises = []
 
 		if (parsedResponse.success) {
+			const filteredModels: string[] = []
+
 			for (const ollamaModel of parsedResponse.data.models) {
 				modelInfoPromises.push(
 					axios
@@ -95,16 +103,28 @@ export async function getOllamaModels(
 							{ headers },
 						)
 						.then((ollamaModelInfo) => {
-							const modelInfo = parseOllamaModel(ollamaModelInfo.data)
+							const { modelInfo, filteredReason } = parseOllamaModel(
+								ollamaModelInfo.data,
+								ollamaModel.name,
+							)
 							// Only include models that support native tools
 							if (modelInfo) {
 								models[ollamaModel.name] = modelInfo
+							} else if (filteredReason) {
+								filteredModels.push(filteredReason)
 							}
 						}),
 				)
 			}
 
 			await Promise.all(modelInfoPromises)
+
+			// Log filtered models to help users understand why models aren't appearing
+			if (filteredModels.length > 0) {
+				console.warn(
+					`[Ollama] ${filteredModels.length} model(s) filtered out due to missing tool support:\n${filteredModels.join("\n")}`,
+				)
+			}
 		} else {
 			console.error(`Error parsing Ollama models response: ${JSON.stringify(parsedResponse.error, null, 2)}`)
 		}

src/api/providers/native-ollama.ts

@@ -206,9 +206,22 @@ export class NativeOllamaHandler extends BaseProvider implements SingleCompletio
 		metadata?: ApiHandlerCreateMessageMetadata,
 	): ApiStream {
 		const client = this.ensureClient()
-		const { id: modelId } = await this.fetchModel()
+		const { id: modelId, info: modelInfo } = await this.fetchModel()
 		const useR1Format = modelId.toLowerCase().includes("deepseek-r1")
 
+		// Log request info for debugging
+		const baseUrl = this.options.ollamaBaseUrl || "http://localhost:11434"
+		console.log(`[Ollama] Starting request to model '${modelId}' at ${baseUrl}`)
+
+		// Warn if the model is not in the fetched models list (may indicate missing tool support)
+		if (!this.models[modelId]) {
+			console.warn(
+				`[Ollama] Warning: Model '${modelId}' was not found in the list of tool-capable models. ` +
+					`This may indicate the model does not support native tool calling. ` +
+					`Check if your Ollama version reports capabilities by running: ollama show ${modelId}`,
+			)
+		}
+
 		const ollamaMessages: Message[] = [
 			{ role: "system", content: systemPrompt },
 			...convertToOllamaMessages(messages),