feat: add User-Agent header to API providers

- Add User-Agent header with format 'roo-cline/3.22.6' to DEFAULT_HEADERS
- Update all provider tests to expect the new User-Agent header
- Add comprehensive test coverage for constants file
- Ensures consistent User-Agent across all API providers (OpenAI, OpenRouter, Requesty, etc.)

Addresses partner request for standardized User-Agent header following <tool_name>/<version> pattern

Author: roomote

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

@@ -0,0 +1,60 @@
+// npx vitest run src/api/providers/__tests__/constants.spec.ts
+
+import { describe, it, expect } from "vitest"
+import { DEFAULT_HEADERS } from "../constants"
+
+describe("DEFAULT_HEADERS", () => {
+	it("should contain all required headers", () => {
+		expect(DEFAULT_HEADERS).toHaveProperty("HTTP-Referer")
+		expect(DEFAULT_HEADERS).toHaveProperty("X-Title")
+		expect(DEFAULT_HEADERS).toHaveProperty("User-Agent")
+	})
+
+	it("should have correct HTTP-Referer value", () => {
+		expect(DEFAULT_HEADERS["HTTP-Referer"]).toBe("https://github.com/RooVetGit/Roo-Cline")
+	})
+
+	it("should have correct X-Title value", () => {
+		expect(DEFAULT_HEADERS["X-Title"]).toBe("Roo Code")
+	})
+
+	it("should have correct User-Agent format", () => {
+		const userAgent = DEFAULT_HEADERS["User-Agent"]
+		expect(userAgent).toBe("roo-cline/3.22.6")
+
+		// Verify it follows the tool_name/version pattern
+		expect(userAgent).toMatch(/^[a-z-]+\/\d+\.\d+\.\d+$/)
+	})
+
+	it("should have User-Agent with correct tool name", () => {
+		const userAgent = DEFAULT_HEADERS["User-Agent"]
+		expect(userAgent.startsWith("roo-cline/")).toBe(true)
+	})
+
+	it("should have User-Agent with semantic version format", () => {
+		const userAgent = DEFAULT_HEADERS["User-Agent"]
+		const version = userAgent.split("/")[1]
+
+		// Check semantic version format (major.minor.patch)
+		expect(version).toMatch(/^\d+\.\d+\.\d+$/)
+
+		// Verify current version
+		expect(version).toBe("3.22.6")
+	})
+
+	it("should be an object with string values", () => {
+		expect(typeof DEFAULT_HEADERS).toBe("object")
+		expect(DEFAULT_HEADERS).not.toBeNull()
+
+		Object.values(DEFAULT_HEADERS).forEach((value) => {
+			expect(typeof value).toBe("string")
+			expect(value.length).toBeGreaterThan(0)
+		})
+	})
+
+	it("should have exactly 3 headers", () => {
+		const headerKeys = Object.keys(DEFAULT_HEADERS)
+		expect(headerKeys).toHaveLength(3)
+		expect(headerKeys).toEqual(["HTTP-Referer", "X-Title", "User-Agent"])
+	})
+})

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

@@ -104,6 +104,7 @@ describe("OpenAiHandler", () => {
 				defaultHeaders: {
 					"HTTP-Referer": "https://github.com/RooVetGit/Roo-Cline",
 					"X-Title": "Roo Code",
+					"User-Agent": "roo-cline/3.22.6",
 				},
 			})
 		})

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

@@ -62,6 +62,7 @@ describe("OpenRouterHandler", () => {
 			defaultHeaders: {
 				"HTTP-Referer": "https://github.com/RooVetGit/Roo-Cline",
 				"X-Title": "Roo Code",
+				"User-Agent": "roo-cline/3.22.6",
 			},
 		})
 	})

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

@@ -59,6 +59,7 @@ describe("RequestyHandler", () => {
 			defaultHeaders: {
 				"HTTP-Referer": "https://github.com/RooVetGit/Roo-Cline",
 				"X-Title": "Roo Code",
+				"User-Agent": "roo-cline/3.22.6",
 			},
 		})
 	})

src/api/providers/constants.ts

@@ -1,4 +1,5 @@
 export const DEFAULT_HEADERS = {
 	"HTTP-Referer": "https://github.com/RooVetGit/Roo-Cline",
 	"X-Title": "Roo Code",
+	"User-Agent": "roo-cline/3.22.6",
 }