expect(headerOf(endpointMockState.calls[2], "MCP-Protocol-Version")).toBe("2025-06-18");

// No bearer token on the anonymous free path.

expect(headerOf(endpointMockState.calls[0], "Authorization")).toBeUndefined();

// Every call identifies OpenClaw at the HTTP layer (not just node).

for (const call of endpointMockState.calls) {

expect(headerOf(call, "User-Agent")).toMatch(/^openclaw-parallel\//);

}

// tools/call carries the documented web_search args.

const callArgs = (readBody(endpointMockState.calls[2]).params as Record<string, unknown>)

.arguments as Record<string, unknown>;

const require = createRequire(import.meta.url);

const PLUGIN_VERSION = readPluginPackageVersion({ require });

// Identify free-tier traffic at the HTTP layer (mirrors the paid REST path);

// without this, undici sends a generic `node` UA and OpenClaw usage is only

// visible via the JSON-RPC `clientInfo` payload.

const USER_AGENT = `openclaw-parallel/${PLUGIN_VERSION} (${process.platform})`;

type JsonRpcMessage = Record<string, unknown>;

}): Record<string, string> {

const headers: Record<string, string> = {

"Content-Type": "application/json",

"User-Agent": USER_AGENT,

// The Search MCP may answer either as a single JSON object or as an SSE

// stream; advertise both so the server can pick.

Accept: "application/json, text/event-stream",