Function userFacingProbeMessage

packages/plugins/mcp/src/sdk/plugin.ts:561–566

(
  shape: Extract<McpShapeProbeResult, { readonly kind: "unreachable" | "not-mcp" }>,
)

 *  reach here; the only outcomes are an unreachable endpoint or a non-MCP one.
 *  Exported for tests. */
export const userFacingProbeMessage = (
  shape: Extract<McpShapeProbeResult, { readonly kind: "unreachable" | "not-mcp" }>,
): string =>
  shape.kind === "unreachable"
    ? "Couldn't reach this URL. Check the address, your network, and that the server is running."
    : "This URL doesn't appear to host an MCP server. Double-check the address, including the path.";

// ---------------------------------------------------------------------------
// MCP-SDK OAuth provider adapter — wraps a pre-resolved access token so the